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Home My WebLink AboutSite Certifications - 10/04/2023Page 1 OVERALL SITE and DRAINAGE CERTIFICATION Commercial, Multi-Family and Subdivision Certification Form and Checklist Project Name: Date: Building Permit Numbers: (Commercial or multi-family) Per the requirement in Fort Collins Stormwater Criteria Manual (FCSCM) Chapter 3, Section 3.0 to certify as- built construction to the approved drainage and grading plans, please fill in all applicable items in this Certification Form for Commercial, Multi-Family and Overall Single Family sites. NOTE: several items must be verified during construction. A copy of the approved grading plan must be submitted with the as-built grading plan. (As-built elevations must be written in red next to the approved elevations.) •Use “Yes” for items completed as described. •Use “N/A” for items that are not applicable to the site being certified. •If any blanks are “No,” attach an explanation referencing the item number below. Attach an explanation or description of the as-built condition for any items listed or for anything not listed but shown on the approved construction plans. Provide an as-built redline or Mylar drawing with the following: I.Water Quality and Quantity Detention Basin - FCSCM Ch. 6 and 7 For multiple detention basins on a site, provide the following for each basin separately: A. Volume: As-built topographic verification is attached at 1-foot (or less) contour intervals and volume verification calculations for the water quality capture volume and the 100-year detention storage volume. 1. Detention basin topography was prepared by a professional land surveyor registered in the state of Colorado. 2.Both proposed and as-built contours are shown on the same plan sheet (dashed lines for proposed and solid lines for as-built). 3.All critical spot elevations as shown on the approved construction plans have been verified and the as-built elevations are shown on the plan sheet. 4.Stage-storage-discharge tables are provided on a separate document. 5.Verification that designed drain time is in compliance with Colorado Revised Statute § 37-92- 602(8) is attached and has been uploaded to the Statewide Compliance Portal (tinyurl.com/COCompliancePortal) for approval. Uploaded documents must include: a.The cover sheet from the approved drainage report b.The stamped certification page from the approved drainage report c.As-built topographic survey d.Stamped certification page from the Overall Site & Drainage Certification e.PDF output from the Stormwater Detention and Infiltration Design Data Speadsheet 11/19 Larimer County Detention Center 08/16/2023 20-08-DCP and CRF200002 Yes N/A No Yes N/A N/A Page 2 B.Water Quality and Quantity Detention Basin Grading: Attached is as-built verification that there is a minimum 2% positive fall into the concrete trickle pans or flow-line(s) from all areas in the bottom of the detention pond. If there is a “soft pan” in the flow-line, all areas still must meet the minimum 2% grade requirement. 1.Low Flow: Choose one of the following detention basin low flow options as applicable: a. Turf swale for low flow path in detention basin. There is a minimum 2% grade in the flow-line(s) of the detention basin. The flattest as-built grade is . b.Concrete pan for low flow in detention basin. There is a concrete pan installed that meets the grades as shown on the approved construction plans. (Show as-built spot elevations.) c.Soft pan for low flow in detention basin. •Verify and document the soft pan material gradation, trench width and depth - to be verified during construction by engineer. Picture documentation is preferred or engineer’s statement of visual inspection and compliance. (Choose one below.) o There is a soft pan with an underdrain installed that meets the design on the approved construction plans. (Show the underdrain grades, bedding material, geotextile, spot elevations, bends, cleanouts, etc.) o There is soft pan installed without an underdrain but there is a type A or B soil. The soil type must be documented by supplying verification from a registered professional geotechnical engineer. NOTE: Spot elevations are to be within 0.2 ft. +/-. 2. Side Slopes: The as-built side slopes of the detention basin have been calculated and are shown. Indicate the side slope with an arrow and a numerical value (e.g., 6.25:1). The maximum slope allowed is 4:1. Small areas of 3:1 may be acceptable, but slopes steeper than 3:1 must be stabilized or re- graded. Provide documentation if a variance was granted for steeper slopes during the design process. 3.Spillway: The following items must be field verified: a.The location of the spillway is indicated on the as-built plan. b.The width of the spillway is indicated on the as-built plan. c.The elevation(s) of the spillway is shown on the as-built plan. d.A concrete ribbon defines the location and grade of the spillway. e.There is downstream scour protection in the spillway as per the construction plans. Indicate type: (riprap size “D50” gradation and bedding type, geotextile, buried riprap with inches of bury, etc.). f.There are no obstructions in the spillway, such as trees, bushes, sidewalks, landscape features, rocks, etc. 11/19 Yes N/A N/A N/A Yes Yes N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A Page 3 4.Outlet Structure: a.The orifice plate for the approved release rate is installed with the correct size and location of the orifice. b.The orifice plate for the water quality outlet is installed with the correct hole size, number of rows and columns of holes. c.The bottom hole on both the water quality and quantity outlets are at the bottom of the plate so no water ponds in front of the plate. d.The well screen is the correct material and is installed as shown on the construction plans. e.100-year overflow grate elevation is . (Elev. A on detail D-46) f.The top elevation of the water quality capture volume is . (Elev. B on detail D-46) g.Overflow grate is made of the correct material, has the correct bar spacing, is hinged at the top and bolted at the bottom. h.The bottom of the outlet box has no obstructions or misalignments that will cause it to retain runoff water and is sloped at 2% towards outlet. II.Channels/Swales - FCSCM Ch. 8, Sec. 2.0 and Ch. 9, Sec. 5.0 A. Capacity: The as-built capacity of all the major channels and swales has been verified. They meet or exceed capacity requirements shown in the approved drainage study for this project. 1.All swales are located within the drainage easements as shown on the construction plans. 2.Longitudinal slopes and side-slopes (cross-sections) have been verified. Design criteria requires longitudinal slopes of 2% min. (on vegetated swales) and side-slopes no steeper than 4:1. If these criteria are not met, the certification engineer will write a justification and propose mitigation for each instance or have the issues corrected. If variances to these criteria have previously been approved and are shown on the construction plans, no justification is needed. 3.As-built spot elevations on channels/swales are shown that correspond to spot elevations shown on the approved construction plans. 4.All permanent erosion control measures are installed as shown on the approved construction plans (e.g., drop structures, riprap, TRMs, etc.). (Include pictures and verification of the materials used as part of this verification.) 5.All pans, curbs, storm pipes or other appurtenances appropriately tie into each other in the system. (Pictures at tie-in points suggested.) 6.The minimum freeboard is provided for all channels and swales as shown on the approved construction plans or as identified in the approved drainage study. (Show the freeboard provided on the cross-sections as on the construction plan set or attached as separate documentation.) 7.The low flow portion of all channels or swales is clear of obstructions. (No landscaping, trees, shrubs, sod, etc. infringe on the low flow portion of channels or swales.) 11/19 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A Yes N/A N/A Yes N/A Yes N/A N/A Page 4 III.Storm Pipes (aka storm drains) - FCSCM Ch. 9, Sec. 4.0 A. Storm Drain Pipe Capacity: The as-built capacity of all pipes installed on this project has been verified and meets or exceeds the capacity requirements shown in the approved drainage study for this project. 1.All storm drain pipe sizes and materials have been verified and are in conformance with the approved construction plans. (Indicate on the plan and profile sheets that they have been verified.) Material and size substitutions must be approved prior to installation. If a pipe size or material was changed during construction, the certification engineer must attach the approval documents or supply them with this certification. Approval documents must include a calculation documenting the capacity equivalency (equal or greater) of the substituted size. 2.The longitudinal slope of the pipe is as shown on the approved construction plans. The acceptable minimum slope is 0.4%. All slopes flatter than the designed slope on the construction plans must be justified with capacity calculations on an attached sheet. 3.The as-built invert elevations have been verified and are shown on the plan and profile sheets of the approved construction plans. B.Storm Drain Pipe Installation Requirements: All pipes are installed in accordance with the approved construction plans and construction specifications. 1.The minimum cover requirements for all pipes have been met as shown on the approved construction plans. These will be called out in critical locations. 2.All encasements and clearances as specified on the approved construction plans have been met. 3.Any specific joint types or construction methods specified on the approved construction plans have been met. (List on a separate sheet and attach to this certification.) IV.Concrete Pans - FCSCM Ch. 8, Sec. 2.0 A. Construction/Installation: All concrete pans have been constructed in accordance with the approved construction plans. 1.The concrete pans are the correct size/width as shown on the approved construction plans. 2.The longitudinal slopes of the pans are as shown on the approved construction plans. The certification engineer must justify or mitigate longitudinal slopes less than the minimum of 0.4% unless a flatter slope was approved and is shown on the approved construction plans. Provide mitigation or justification by separate document. 3.The cross-section of the pan is as shown on the construction plans. (Specifically, the pan cross- section is “V” shaped and meets the side slope shown on the detail.) 4.The concrete pans are a minimum of 6 inches thick without reinforcement and a minimum of 4 inches thick with a minimum of 6X6-W14xW14 reinforcement per detail D20B and D20C. (Provide documentation of the reinforcement used if different than shown on the details or on the approved construction plans.) 5.The spot elevations shown on the concrete pan(s) have been verified and are shown on the as- built drawings. 11/19 No No No No Yes Yes Yes N/A No Yes No Yes Yes No Page 5 V. Storm Drain Inlets - FCSCM Ch. 9, Sec. 3.0 A. Construction/Installation: All storm drain inlets have been constructed in accordance with the approved construction plans and construction specifications. 1.The size and type of inlets are consistent with the inlets shown on the approved construction plan. Indicate by writing “Verified” on each inlet on the plan sheet or list on a separate document the inlet number(s), type and size (length). If the inlet installed is other than the one on the approved construction plan detail sheet, provide the name and source of the detail with justification for equal or better capacity. 2.The size of the inlet opening is consistent with the approved detail. (Check height and width.) 3.The elevation of the grate (if applicable) is at the elevation shown on the street profile or as indicated by a spot elevation on the construction plans. 4.The as-built invert elevations of all pipes entering and leaving the inlet are shown on the plan and profile sheets within construction tolerance of 0.2 feet. If substantially different, provide justification and capacity calculations to show the capacity is not affected or propose mitigation. 5.The as-built size of the inlet box is as shown on the construction plans or an explanation or justification is attached. 6.All Type C, R, 13 and 16 inlet covers are stenciled or stamped with the following designation (or an equivalent): NO DUMPING – DRAINS TO POUDRE RIVER. VI.Culverts - FCSCM Ch. 9, Sec. 4.0 A. Construction/Installation: All culverts have been constructed and/or installed in accordance with the approved construction plans and construction specifications. 1.All culvert sizes have been verified as indicated on the as-built construction plans as correct. 2.The culvert material type for all culverts installed is as on the approved construction plans and is indicated on the as-built plans. 3.The as-built invert “in and out” elevations have been verified and are indicated on the as-built construction plans. 4.The culvert headwalls or wing walls have been installed as shown on the approved construction plans. Headwalls or wing walls may be needed in the as-built conditions onsite if the slopes adjacent to the culvert are greater than 4:1. Please note areas needing stabilization in the certification narrative. An alternative to consider is a turf reinforcement mat (TRM). VII.Sub-Drains A. Construction/Installation: All sub-drains shown on the construction plans have been installed in accordance with those plans and the construction specifications. Sub-drains installed with the sanitary sewer are to be verified on the sanitary sewer plan and profile sheets of the construction plans. (NOTE: Indicate any sub-drains installed after the plans were approved on the as-built plans.) 1.The size of the sub-drains are as approved on the construction plans and are indicated on the as- built plans. 2.The type of sub-drain, in particular the perforated and non-perforated sections of the drain, are as indicated on the approved construction plans. 11/19 No Yes Yes No No Yes Yes N/A N/A N/A N/A N/A N/A N/A N/A Page 6 3.The cover requirements per the construction plans are provided. 4.The cleanouts have been installed at the locations shown on the construction plans and are accessible for cleaning. (Cleanouts can be buried a maximum of 6 inches deep with their locations marked.) 5.The backfill materials for sub-drains are as shown on the approved construction plans. (This includes the type, depth and width.) 6.The geo-textile liner completely wraps the sub-drain and the permeable backfill material unless shown otherwise on the approved construction plans. (Sub-drain pipe wrapped in a sock filter material is accepted only if approved prior to installation.) VIII.Curb Cuts A. Construction: All curb cut openings are constructed in accordance with the approved construction plans and construction specifications. 1.The size (width) of the curb cut opening is as shown on the approved construction plans. 2.The curb cut openings tie into a downstream swale, pipe, or other appurtenances with a smooth transition and there no obstructions such as riprap or sod impeding the flow downstream of the curb cut. IX.Sidewalk Culverts & Chases A. Construction/Installation: All sidewalk culverts have been installed at the locations shown on the approved construction plans. 1.The size (width and length) of the culverts are as shown on the approved construction plans. 2.The cover plate is a minimum 5/8-inch galvanized plate bolted to a galvanized angle iron per the detail shown on the approved construction plans or per the City’s detail. 3.The sidewalk culvert invert “in and out” elevations have been verified and are indicated on the as-built plans. 4.The sidewalk culvert opening is as shown on the approved construction plans or per the City’s detail. 5.There is a smooth transition both on the inlet and outlet ends of the sidewalk culvert with no obstructions such as riprap or sod impeding the flow into or out of the sidewalk culvert. X. Site Grading - FCSCM Ch. 8 A. Construction: All common open spaces have been graded in accordance with the approved construction plans. 1.The grading on all common open spaces bordering private lots has been verified as correct and the as-built rear lot corner elevations have been shown on the as-built plans. 11/19 detail Yes N/A N/A N/A N/A No N/A N/A No Yes Yes No Yes Yes No Page 7 2.The as-built contours for “overlot grading” are shown on the as-built construction plans for all common open spaces, tracts, outlots, etc. If not in compliance, please attach a narrative describing the situation for noncompliance and when it may be corrected. An escrow for overlot grading may be required. (NOTE: Residential Lot Grading Certification is a separate process from this Overall Site Certification. It is understood that residential lots will be brought to final grade once the foundation is backfilled so they may be lower than the plan shows at this Overall Site Certification stage.) 3.All turf reinforcement mats (TRMs) have been installed as shown on the approved construction plans and the slopes are stabilized. XI.Permanent Erosion Control BMPs - FCSCM Ch. 9, Sec. 7.0 A. Construction: All permanent erosion control BMPs have been installed per the approved construction plans. 1.All riprap has been installed in the locations and sizes indicated on the approved construction plans. 2.All fabric has been installed in the locations and sizes indicated on the approved construction plans. a.All fabric was installed per the details on the approved construction plans. XII.Post-Construction Site Cleanup - FCSCM Ch. 3, Sec. 2.0 A. Construction: All construction debris and obstructions of any kind have been removed from drainage paths. 1.All construction debris has been removed except in staging area(s). 2.All ruts have been smoothed out in all construction areas. 3.All areas needing reseeding have been identified and future stabilization goals have been coordinated with the Erosion Control Inspector and in accordance with FCSCM Vol.2 Chapter 12. Note the area needing stabilization in the narrative. XIII.Certification of LID and Water Quality Facilities - FCSCM Ch. 7 A.Attached are the During Construction Inspection Checklist for Low Impact Development (LID) and other items to be verified during construction, along with pictures and other required documentation. B.Attached is verification of the rain garden and/or sand filter flat surface area(s) and ponding volume(s). This verification includes survey of critical elevations. C.Attached is verification of the underground infiltration required volume(s), weir elevations, orifices, inspection ports and filtering fabric. This verification includes survey of critical elevations. D.All visible LID design features were verified as part of the engineer's site visit. 11/19 No N/A Yes Yes N/A N/A Yes Yes Yes Yes Yes Yes N/A Yes 11/19 Page 8 XIV.Certification of Other Permanent BMPs A.The construction of other permanent BMPs not specifically addressed in this certification is in accordance with the approved plan. This may include grade control structures, rundowns, bridges, stream access/improvements, etc. Please specify other permanent BMPs included on this site: XV. Certification and Erosion Control Measures - FCSCM Ch. 3 A. All temporary erosion control measures shall be removed upon stabilization. If at the time of preparing this certification there are any erosion control measures still remaining on the site, please note them in the narrative and verify that they need to remain at this time. If in doubt as to the need for any control measure, please consult with the Erosion Control Inspector at erosion@fcgov.com. XVI.Statement of Compliance - FCSCM Ch. 3 A. This certification is signed and stamped. By signing this form, the engineer(s) attests that he/she has visited and observed the site, and to the best of his/her knowledge, the as-built conditions of the drainage facilities are as described in the above form and in the enclosed as-built plans. B.Failure to properly disclose all known information could result in the rejection of this certification and prevent the release of any and all Stormwater Utility permit holds on Building Permits and/or Certificates of Occupancy within this development. XVII. Signature and Stamp by a Colorado-Registered Professional Engineer Engineer’s contact information: Name: Email: Phone: Company: Address: PE Stamp 8/31/2023 N/A N/A Mark D. Thornbrough mthornbrough@martinmartin.com 303.638.4023 Martin/Martin, Inc. 12499 W Colfax Ave Lakewood, CO 80215 Mark D. Thornbrough Digitally signed by Mark D. Thornbrough Date: 2023.08.31 15:27:03-06'00' FT COLLINS OVERALL SITE AND DRAINAGE CERTIFICATION LARIMER COUNTY JAIL EXPLANATIONS AUGUST 18, 2023 To the City of Fort Collins, This letter serves as a supplement to the Overall Site and Drainage Certification as required by the Fort Collins Stormwater Criteria Manual (FCSCM) Chapter 3, Section 3.0. The document is structured to follow the Certification’s formatting and provides justification for items that were marked as “No,” or where supplementary information was considered helpful for the certification. I. WATER QUALITY AND QUANTITY DETENTION BASINS A. Volume 1. This item, as well as Item 4, were marked as “N/A” as this project drains to a regional detention pond that was not modified as part of this project. The approved drainage report confirmed that the proposed development was in conformance with the intent of the regional detention pond design. 2. This item has been marked as “No” as the contractor supplied as-built survey did not include as-built contours. However, sufficient as-built spot elevations and measurements of the Water Quality Basin’s geometry, depth and related storm infrastructure to confirm the Basin was constructed with sufficient volume and in conformance with the intent of the design. 5. This item was marked as “N/A” as the only stormwater feature on site is a water quality feature, and per CRS §37-92-602(8) does not need to be uploaded to the Statewide Compliance Portal. B. Water Quality and Quantity Detention Basin Grading 1. Low Flow c. The Water Quality Basin has underdrains with the bottom of the very narrow basin in substantial conformance with the intent of the design. 2. Side Slope items have been marked as “N/A” as there is no proposed detention basin as part of this project. However, based on a combination of contractor provided as-built survey and our observations, the side slopes of the Water Quality Basin were constructed in substantial conformance with the intent of the design. 3. Spillway items have been marked as “N/A” as there is no proposed detention basin as part of this project. Storm flow exceeding the water quality event flows through WQ Basin storm infrastructure or sheet flows into the pre-project regional detention pond. These elements were constructed in substantial conformance with the intent of the design. 4. Outlet Structure items have been marked as “N/A” as there is no proposed detention basin as part of this project. Storm flow exceeding the water quality event flows through WQ Basin storm FT COLLINS OVERALL SITE AND DRAINAGE CERTIFICATION August 18, 2023 P a g e 2 | 6 infrastructure or sheet flows into the pre-project regional detention pond. These elements were constructed in substantial conformance with the intent of the design. II. CHANNELS/SWALES A. Channels/swales items in this section have been marked as “YES”, although there are no MAJOR swales in the project for significant stormwater conveyance. The three minor swales are primarily designed to encourage drainage away from the building and toward inlets or curb/gutter. 3. Contractor supplied as-builts confirm some but not all of the minor swales were constructed per the design. Based on our site observations, we believe all of the swales were constructed in substantial conformance with the intent of the design. III. STORM PIPES A. This overall item has been marked as “No” due to the following items: 1. This item has been marked as “No” as not all storm drainpipe sizes and/or materials were documented in the as-built information provided by the contractor as-builts. Drainpipe sizes and/or materials provided by the contractor as-builts area shown on the plan and profile sheets. Drainpipe sizes and materials submitted for use at the project and those observed during our site visits meet with the approved design plans. We are unaware of construction deviations from the design plans and believe the as-built storm system substantially meets the intent of the design. 2. This item has been marked as “No” as not all as-built longitudinal pipe slopes, or sufficient as-built invert elevations were provided to calculate all pipe slopes. Of those that could be evaluated, two (2) pipes were determined to have a pipe slope less than the minimum 0.4%. Where the pipes were sized to convey the major storm in most cases, they are flowing full or near full, and are driven by the hydraulic grade where flatter pipe slopes do not impact their design capacity. Subject to our review of the as-built pipe slopes, we believe the as-built storm system substantially meets the intent of the design. 3. This item has been marked as “No” as not all as-built invert elevations were provided in the contractor supplied as-builts. See explanation to number 2 above. IV. CONCRETE PANS A. This overall item has been marked as “No” due to the following items: 2. Marked as “No” because insufficient information was provided on the contractor as-builts to verify all concrete pan(s) meet longitudinal slopes. However, based on our site observations, we believe the concrete pans have sufficient slope to meet the intent of the design. 4. Subject to attached correspondence with the contractor, we believe there were deviations in the pan thicknesses identified in the approved design. 5. Marked as “No” because insufficient information was provided on the contractor as-builts to verify all concrete pan(s). Based on our site observations, we believe all concrete pans substantially meet the intent of the approved design. FT COLLINS OVERALL SITE AND DRAINAGE CERTIFICATION August 18, 2023 P a g e 3 | 6 V. STORM DRAIN INLETS A. This overall item has been marked as “No” due to the following items: 3. This item has been marked as “No” as not all as-built grate elevations were provided by the contractor. However, those pipe invert elevations provided are shown on the plans and meet with the intent of the design. 4. This item has been marked as “No” as not all as-built invert elevations of all pipes entering and leaving the inlet was provided by the contractor. However, those that were provided are shown on the plan and profile sheets. None of the variations in grate elevation were determined to be substantially different to affect design intent or capacity. VI. CULVERTS Culvert items have been marked as “N/A” as there are no proposed culverts as part of this project. VII. SUB-DRAINS Sub-Drain items have been marked as “N/A” as there are no proposed sub-drains as part of this project. VIII. CURB CUTS This overall item has been marked as “No” because the proposed curb cut on the project, at the northwest corner of the building, was removed as a part of the design along with the removal of the adjacent minor swale due to space constraints with adjacent utilities. We believe the as-built conditions of this area still substantially meet the intent of the design. All other checklist items for this section are marked as “N/A” due to the removal of the proposed curb cut from the design. IX. SIDEWALK CULVERTS & CHASES A. This overall item has been marked as “No” due to the following items: 3. This item has been marked as “No” as not all sidewalk chases “in and out” elevations were provided with the contractor as-builts. However, as-built information provided is shown on the as-built grading plans. X. SITE GRADING A. This overall item has been marked as “No” due to the following items: 2. This item has been marked as “No” as the contractor as-builts do not show as-built contours. Based on our site observations and review of the contractor as-builts, we believe the as-constructed grading meets with the intent of the design. FT COLLINS OVERALL SITE AND DRAINAGE CERTIFICATION August 18, 2023 P a g e 4 | 6 XII. POST-CONSTRUCTION SITE CLEANUP 3. Areas requiring reseeding have been identified by the Contractor; reseeding of areas south of the site were in progress during the site visit for this certification. XIV. CERTIFICATION OF OTHER PERMANENT BMPS The Certification of Other BMPs items have been marked as “N/A” as no other permanent BMPs not specifically addressed in this certification are included in this project. XV. CERTIFICATION AND EROSION CONTROL MEASURES A. Inlet protection remains on site for the CDOT Type C Inlet, as well as a small amount of silt fencing, while the site is being stabilized. They appear necessary at the time of the site visit for this certification and are to be removed upon final site stabilization. FT COLLINS OVERALL SITE AND DRAINAGE CERTIFICATION August 18, 2023 P a g e 5 | 6 Grading and Site Appendix Items 1. City Stormwater Approved Grading Plan 2. As-built Survey 3. As-built Grading Plans 4. As-built Storm Plans 5. Contractor-Provided Storm Markups 6. Coordination with Contractor for Additional Verifications KIN G SUR V E Y O R S 65 0 E . G a r d e n D r i v e | W i n d s o r , C o l o r a d o 8 0 5 5 0 ph o n e : ( 9 7 0 ) 6 8 6 - 5 0 1 1 | e m a i l : c o n t a c t @ k i n g s u r v e y o r s . c o m 1 FOR JE DUNN CONSTRUCTION AS-BUILT SURVEYOf LARIMER COUNTY JAIL DOWNSPOUT KIN G SUR V E Y O R S 65 0 E . G a r d e n D r i v e | W i n d s o r , C o l o r a d o 8 0 5 5 0 ph o n e : ( 9 7 0 ) 6 8 6 - 5 0 1 1 | e m a i l : c o n t a c t @ k i n g s u r v e y o r s . c o m 2 FOR JE DUNN CONSTRUCTION AS-BUILT SURVEYOf LARIMER COUNTY JAIL DOWNSPOUT KIN G SUR V E Y O R S 65 0 E . G a r d e n D r i v e | W i n d s o r , C o l o r a d o 8 0 5 5 0 ph o n e : ( 9 7 0 ) 6 8 6 - 5 0 1 1 | e m a i l : c o n t a c t @ k i n g s u r v e y o r s . c o m 3 FOR JE DUNN CONSTRUCTION AS-BUILT SURVEYOf LARIMER COUNTY JAIL KIN G SUR V E Y O R S 65 0 E . G a r d e n D r i v e | W i n d s o r , C o l o r a d o 8 0 5 5 0 ph o n e : ( 9 7 0 ) 6 8 6 - 5 0 1 1 | e m a i l : c o n t a c t @ k i n g s u r v e y o r s . c o m 4 FOR JE DUNN CONSTRUCTION AS-BUILT SURVEYOf LARIMER COUNTY JAIL 30" NYLOPLAST INLET 30" NYLOPLAST INLET 36" NYLOPLAST INLET 4'Ø STRM MH 4'Ø STRM MH 4'Ø STRM MH W/ GRATE LID 4'Ø STRM MH W/ GRATE LID CONNECT TO EX STORM CONNECT TO EXISTING 5' TYPE R INLET STORM NORTH SERVICE 4' Ø S T R M M H 4' Ø S T R M M H 36 " N Y L O P L A S T I N L E T TRENCH DRAIN CONNECTION TO PVC PIPE 4' Ø S T R M M H W / G R A T E L I D CO N N E C T T O E X S T O R M 4' Ø S T R M M H W / G R A T E L I D © D L R G r o u p © D L R G r o u p © D L R G r o u p - N O T F O R CO N S T R U C T I O N - © D L R G r o u p © D L R G r o u p © D L R G r o u p - N O T F O R CO N S T R U C T I O N - 37-19202-00 06/12/2020 LA R I M E R C O U N T Y J A I L I M P R O V E M E N T S CONSTRUCTION DOCUMENTS - PACKAGE 1 24 0 5 M I D P O I N T D R I V E , FO R T C O L L I N S , C O 8 0 5 2 5 LA R I M E R C O U N T Y P R O J E C T # 2 0 - Z O N E 2 6 4 1 MAR T I N /M AR T I N C O N S U L T I N G E N G I N E E R S 12 4 9 9 W E S T C O L F A X A V E N U E , L A K E W O O D , C O L O R A D O 8 0 2 1 5 30 3 . 4 3 1 . 6 1 0 0 M A R T I N M A R T I N . C O M Revisions 08/06/2020 PACKAGE 3 09/04/2020 RFI 45 09/14/2020 RFI 50 09/14/2020 RFI 63 STORM PLAN & PROFILE C500 811 ” ” ” ” 76.5' 27'41' 3 08/06/2020 28' 67' 23' 28' 200.42' 261.50'' 49 0 0 . 5 8 49 0 0 . 0 6 49 0 2 . 4 8 Qu i c k S e a l Qu i c k S e a l Qu i c k S e a l Qu i c k S e a l 4904.73 4902.89 34' Dunrite Excavation Storm Asbuilts 10/27/20 J 30" NYLOPLAST INLET ROOF DRAIN CONNECTION RE: PLUMBING 30" NYLOPLAST INLET 30" NYLOPLAST INLET 4'Ø STRM MH 4'Ø STRM MH5'Ø STRM MH ROOF DRAIN CONNECTION RE: PLUMBING 30" NYLOPLAST INLET 4'Ø STRM MH W/ GRATE 30" NYLOPLAST INLET STORM CLEAN OUTROOF DRAIN CONNECTION RE: PLUMBING ROOF DRAIN CONNECTION RE: PLUMBING STORM SALLY PORT SERVICE 30 " N Y L O P L A S T I N L E T 30 " N Y L O P L A S T I N L E T 30 " N Y L O P L A S T I N L E T 4' Ø S T R M M H 4' Ø S T R M M H 5' Ø S T R M M H 4' Ø S T R M M H W / G R A T E © D L R G r o u p © D L R G r o u p © D L R G r o u p - N O T F O R CO N S T R U C T I O N - © D L R G r o u p © D L R G r o u p © D L R G r o u p - N O T F O R CO N S T R U C T I O N - 37-19202-00 06/12/2020 LA R I M E R C O U N T Y J A I L I M P R O V E M E N T S CONSTRUCTION DOCUMENTS - PACKAGE 1 24 0 5 M I D P O I N T D R I V E , FO R T C O L L I N S , C O 8 0 5 2 5 LA R I M E R C O U N T Y P R O J E C T # 2 0 - Z O N E 2 6 4 1 MAR T I N /M AR T I N C O N S U L T I N G E N G I N E E R S 12 4 9 9 W E S T C O L F A X A V E N U E , L A K E W O O D , C O L O R A D O 8 0 2 1 5 30 3 . 4 3 1 . 6 1 0 0 M A R T I N M A R T I N . C O M Revisions 08/06/2020 PACKAGE 3 09/04/2020 RFI 45 09/14/2020 RFI 50 09/14/2020 RFI 63 09/16/2020 RFI 79 11/24/2020 RFI 162 11/30/2020 RFI 160 12/07/2020 RFI 179 12/11/2020 ASI 4 STORM PLAN & PROFILE C502 811 ” ” ” ” High deflection couplings used as design changed after nyloplast was ordered, concrete collars poured over couplers. 6 inch core and seal boot used for 6 inch roof drain into nyloplast. 38lf 6" PVC 6x6 wye installed to clean out and roof drain 3lf 6" pvc to roof drain 4905.20 4905.24 Dunrite Excavation Roof Drain Asbuilts 11/10/2021 4902.96 148' 4902.34 TOP 4903.50 5' 4902.44 Board 2 See additional comments below. Thanks, Jake From: Kayla Fochtman <KFochtman@martinmartin.com> Sent: Tuesday, July 18, 2023 4:59 PM To: Jake Coutts <Jake.Coutts@jedunn.com> Cc: dbragg <dbragg@larimer.org>; Clark, Michael <michael.clark@dlrgroup.com>; Todd Karnik <Todd.Karnik@jedunn.com> Subject: RE: City of Fort Collins Site Certification forms Hi Jake, Thanks for sending the as-built information. I’ve gone extensively through all the certification requirements for the city of Fort Collins and Larimer County and determined a number of things we still need to wrap up these forms. I ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message came from outside your organization. ZjQcmQRYFpfptBannerEnd Hi Jake, Thanks for sending the as-built information. I’ve gone extensively through all the certification requirements for the city of Fort Collins and Larimer County and determined a number of things we still need to wrap up these forms. I understand the City of Fort Collins certifications are the priority here, so that’s what we’re focusing on. Our general notes ask for record drawings to be a marked-up set of “Issued for Construction” drawings so they can be documented during construction and provide a more thorough documentation of what has changed vs. what was constructed as designed. To have a marked-up set would make this process quicker. If you do not have these documents, I can use just the surveyed information provided, but it will take more time to do a thorough comparison of the as-built survey to our construction plans and I required additional verification on how things were constructed (see my questions below). Also, while Mark visited the site in late April, I expect we may need to make an additional site visit to make some final observations as part of this certification process. For these reasons, I expect preparing these forms will bleed into next week, pending on when we can get these questions answered and make a visit to the site. Items that were identified in the city certifications that I need further information on are: 1. Verification of the top of foundation/finished floor.[Jake Coutts] We are confirming if these shots were taken. AHJ would have inspected prior to allowing us to backfill the foundation and confirm installation per drawings/details. 2. Downspout locations and discharge directions identified on the as-built survey.[Jake Coutts] See the attached two Exhibits 1 &2 for the location and direction. 3. Pipe sizes or verification they are as designed (and verification of pipe classes).[Jake Coutts] This would be per the redlines that we all received from Dunrite and submittal package. 4. Inlet types and sizes or verification they are as designed.[Jake Coutts] Per the submittal and redlines provided by Dunrite. 5. There are missing swale inverts for swale at the NW corner of the building (shown in the screen shot below this email).[Jake Coutts] There isn’t a swale due to the existing grades and the issue we all had getting the grease trap installed in that area. 6. Verification concrete encasement on the western stormline has been constructed as designed.[Jake Coutts] See the attached storm as-built. 7. There appears to be missing information for the intermediate inlets on the western storm line (shown in a screen shot below this email).[Jake Coutts] Good catch, please see the attached storm as-built. 8. Verification geotextile fabric was installed in the rain garden as designed.[Jake Coutts] Confirmed and approved by the City on 7/18/23 during our site walk with Dan & Amy. II. Channels/Swales 3 These are items requested in the city certifications that I have identified could be verified on a site visit, but here’s a list of what we need to verify:[Jake Coutts] Site visit with one of our team members would wonderful. 9. Landscaping has been completed and final cleanup is complete; areas for reseeding have been identified.[Jake Coutts] This is still in process and working to be completed over the next two weeks. 10. Curb cut at NW corner of building was constructed as designed.[Jake Coutts] Need more information on the location you might be thinking. 11. All Type C, R, 13, and 16 inlet covers are stenciled or stamped with “No Dumping – Drains to Poudre River.”[Jake Coutts] No remembering this requirement nor did I find it in the drawings or specifications. Can you refresh my memory on where this one is coming from? Inspectors didn’t mention anything over the years so I am not sure on this one. 12. Sidewalk chase cover plate is min 5/8” galvanized plate bolted to galvanized angle iron.[Jake Coutts] Confirmed 13. The curb cut and sidewalk chase have no obstructions.[Jake Coutts] Confirmed 14. Temporary erosion control measures have been removed or justified for why they remain.[Jake Coutts] Yes and in the process of removing the ones identified with Dan & Amy on 7/18/23. Additional items that are required for certification with the county are as follows; these were also identified by Mark in a previous email: 15. Inspection and material testing certifications.[Jake Coutts] See attached letters from the Ground Engineering. 16. Verification of vegetation establishment and permanent BMP worksheets (provided by landscape architect).[Jake Coutts] Michael, can you request this from BHA? Thanks, Kayla IX. Sidewalk Culverts & Chases, #2 1 Kayla Fochtman From:Von Owen <Von.Owen@jedunn.com> Sent:Tuesday, August 22, 2023 3:44 PM To:Kayla Fochtman Cc:Clark, Michael; Todd Karnik; Jake Coutts; dbragg; Mark Thornbrough Subject:RE: LCJ Certifications Follow-Up Attachments:King Surveyor Points.pdf; Storm Asbuilts.pdf Follow Up Flag:Follow up Flag Status:Flagged See comments below in green. Please give me call if you have any questions or need anything. From: Kayla Fochtman <KFochtman@martinmartin.com> Sent: Monday, August 21, 2023 12:01 PM To: Von Owen <Von.Owen@jedunn.com> Cc: Clark, Michael <michael.clark@dlrgroup.com>; Todd Karnik <Todd.Karnik@jedunn.com>; Jake Coutts <Jake.Coutts@jedunn.com>; dbragg <dbragg@larimer.org>; Mark Thornbrough <mthornbrough@martinmartin.com> Subject: RE: LCJ Certifications Follow-Up Hi Von, Thanks for reaching out. I’m wrapping up the checklist with Claire and Mark’s feedback from the site visit, and we are getting close to wrapping the certifications up. There are a couple questions and checks that have arisen from our ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message came from outside your organization. ZjQcmQRYFpfptBannerEnd Hi Von, Thanks for reaching out. I’m wrapping up the checklist with Claire and Mark’s feedback from the site visit, and we are ge<ng close to wrapping the cer=ﬁca=ons up. There are a couple ques=ons and checks that have arisen from our internal coordina=on; they are as follows. 1. Please verify the concrete pans were constructed per the concrete pan detail on Sheet C801 (6 inch thick). Conﬁrmed per JE Dunn. 2. Please verify that CDOT Type C inlet got a “No Dumping – Drains to River” stamp or stencil. Conﬁrmed per my previous email and photo. 3. On the south storm service line, can you verify what is meant by quick seal? I understand you discussed it on site, but we want to be sure we document it correctly. Is there no structure built at these loca=ons? Can you help clarify this bullet 3? Are you looking for the assembly for the storm line that feeds to the Type C inlet on the aIached “Storm As-Builts” pdf on page two? The two future drain connec=ons have not been installed. 4. My understanding is there was a chance you could get the western pipe for the north storm service line surveyed (screenshoIed below) since that informa=on was missing from the previous survey – if you can get that surveyed this week, we will happily add that to our as-builts. Otherwise, we plan on moving forward with the cer=ﬁca=ons this week as they are almost complete. King Survey is schedule out 2 weeks at this point in =me, I don’t believe this is worth wai=ng for here. IV. Concrete Pans, #4 V. Storm Drain Inlets, #6 2 5. There are several ques=ons regarding drainage in the alcove and the storm line added (area screenshoIed below). a. It seems the storm line/daylight was added as part of RFI 457, but we only have PDF markups of the solu=on which do not appear to match on-site observa=ons. Please provide any as-built documenta=on you have on the size, inverts, or loca=on of this storm line so we can show it accurately on the as-builts. Correct, reference the aIached “King Surveyor Points” on page 2 showing an 8” PVC as well as the invert and the RFI markups in blue. b. Can you clarify how the alcove between the new building sec=on and the exis=ng building (in the screenshot below) is draining? We call out a swale on our plans; has the subgrade under the gravel been graded in a swale as the design indicated? Has there been any drainage issues in this area; it appears like a ﬂat area from site observa=ons? No, we haven’t had any drainage issues within this space. We did not modify the 81’ SS and daylighted in this scenario. The grade is higher at the exis=ng 3 story on the East and at the new sidewalk for the chases on the West which creates the swale and is also sloping North to South as the grade declines. II. Channels/Swales 1 Kayla Fochtman From:Von Owen <Von.Owen@jedunn.com> Sent:Monday, August 28, 2023 10:42 AM To:Kayla Fochtman Cc:Clark, Michael; Todd Karnik; Jake Coutts; dbragg; Mark Thornbrough Subject:RE: LCJ Certifications Follow-Up Follow Up Flag:Follow up Flag Status:Completed Our records show all stubs were installed. All 5 of the yellow highlighted connections below were made with quick seals. Per conversations and directions back in August of 2020, the 5 – 36” nyloplast drains were deleted and the connections were made with quick seals. The furthest east 36” nyloplast at station 124+39.27 as construction as a 4’ diameter manhole. In discussion with both Todd and Dunrite the tie into storm is just Southwest of the SW corner of the existing 3-story, need be I can try to dig up some additional confirmation of this but for what it is worth this is the approximate location. From: Kayla Fochtman <KFochtman@martinmartin.com> Sent: Thursday, August 24, 2023 6:03 PM To: Von Owen <Von.Owen@jedunn.com> Cc: Clark, Michael <michael.clark@dlrgroup.com>; Todd Karnik <Todd.Karnik@jedunn.com>; Jake Coutts <Jake.Coutts@jedunn.com>; dbragg <dbragg@larimer.org>; Mark Thornbrough <mthornbrough@martinmartin.com> Subject: RE: LCJ Certifications Follow-Up Von, Thanks for the info. Following up on two of those items: 3. I understand the two future drain connections have not been installed; I’d like to verify it is continuous pipe from the Sta 120+00 manhole to the Sta 121+91. 17 manhole with no ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message came from outside your organization. ZjQcmQRYFpfptBannerEnd Von, Thanks for the info. Following up on two of those items: 3. I understand the two future drain connections have not been installed; I’d like to verify it is continuous pipe from the Sta 120+00 manhole to the Sta 121+91.17 manhole with no structures or fittings installed where those future drains were intended to be. Similarly, I’d like to also verify how the roof drains east of this are connecting into the mainline. The note “Quick Seal” was used on the as-built mark-ups for both where a service line was built and where it wasn’t, hence our confusion. See attached for more details. 5a. Yes, I’ve got the invert and horizontal location of the outfall on that RFI 457 eastern storm drain – do you have any additional as-built information regarding where the drain ties into existing storm? I just wanted to use the most accurate information we have since the RFI was a rough mark-up. Thanks, Kayla Kayla Fochtman, PE Additional As-built Information FT COLLINS OVERALL SITE AND DRAINAGE CERTIFICATION August 15, 2023 P a g e 6 | 6 Water Quality Appendix Items 1. As-built Rain Garden Plan 2. Rain Garden Volume Verification 3. During Construction Inspection Checklist for LID Rain Garden May 16, 2023 Dan Mogen Development Review Engineer City of Fort Collins 281 N College Ave Fort Collins, CO 80524 Re: Larimer County Jail Rain Garden Certification Letter Martin/Martin, Inc. Project No.: 19.0222 The water quality rain garden for the Larimer County Jail project was reviewed based on as-built survey provided by the contractor. This letter is to certify that the above-mentioned feature was installed in substantial conformance with the drainage report and plans for the project. The findings are based upon survey data prepared by King Surveyors and provided by JE Dunn Construction on May 8, 2023. The design volumes, underdrain system, and overflow structures have been constructed in substantial conformance with the plans and specifications. Despite slight variations in the water surface depth as shown below, the rain garden is determined to have adequate capacity for the water quality volume and is in substantial compliance with the design intent. WQCV (ft3) WQCV Depth (in) Rain Garden Total Volume (ft3) Design 2741 6 2809 As-built Condition 2741 7.3 5698 See the attached as-built plan and stage storage spreadsheet for reference. Please contact us if you have any questions regarding this certification. Sincerely, Mark D. Thornbrough, PE Principal 5/17/2023 PROJECT INFORMATION PROJECT NAME:Larimer Co Jail Expansion PROJECT #:19.0222 POND NAME:Rain Garden DATE:2023.05.17 Required Water Quality Volume = 2741 (ft³) 0.063 (ac-ft) Water Quality Surface Elevation =4899.61 Required 5-Year Volume = (ft³) (ac-ft) 5-Year Water Surface Elevation = Required 10-Year Volume = (ft³) (ac-ft) 10-Year Water Surface Elevation = Required 100-Year Volume = (ft³) (ac-ft) 100-Year Water Surface Elevation = Total Pond Volume =5698 (ft³) 0.131 (ac-ft) Incremental Volume= Contour Elevation Contour Area (ft²)Cumulative Volume (ft³)Cumulative Volume (acre-ft) 4899.00 1320.0 0 0.00 4899.20 4050.0 512 0.01 4899.40 5650.0 1478 0.03 4899.60 6370.0 2679 0.06 4899.80 8000.0 4113 0.09 4900.00 7850.0 5698 0.13 Volume (ft³) 0 512 966 1201 1434 1585 5/17/2023 4:36 PM Pond_WSEL G:\Thornbrough\19.0222-Larimer County Jail Expansion\ENG\DRAINAGE\Rain Garden\_AS Built\As builts Stage Storage - Checking Capacity.xlsm KIN G SUR V E Y O R S 65 0 E . G a r d e n D r i v e | W i n d s o r , C o l o r a d o 8 0 5 5 0 ph o n e : ( 9 7 0 ) 6 8 6 - 5 0 1 1 | e m a i l : c o n t a c t @ k i n g s u r v e y o r s . c o m 1 FOR JE DUNN CONSTRUCTION RAIN GARDEN AS-BUILT SURVEYOf LARIMER COUNTY JAIL 1/19 Page 1 of 2 DURING CONSTRUCTION INSPECTION CHECKLIST To be completed by Construction Superintendent This checklist is to be completed during construction and included with the Overall Site and Drainage Certification. · Use “Yes” for items completed as described. · Use “N/A” for items that are not applicable to the site being certified. · If any blanks are “No,” attach an explanation referencing the item number below. Project Name: Larimer County Jail Date: 10/12/2021 Building Permit Numbers: I. Compaction A. N/A All berms and embankments meet the compaction requirements as specified in the project geotechnical report or comply with the City’s standard, which is “soils should be compacted within a moisture content range of 2% below to 2% above optimum moisture content and compacted to 95% of the Maximum Standard Proctor Density (ASTM D698).” Compaction requires verification during construction. Provide testing log from contractor/engineer. II. Storm Drain Pipe Installation Requirements A. Yes The pipe trenches have been compacted in accordance with Section 02225-3.07.A.1. of the Fort Collins Development Construction Standards for Water, Wastewater, Stormwater (e.g., the trenches in the roadways are to be 95% of maximum density and all other areas are to be at 90%, both in accordance with ASTM D698). III. Energy Dissipation and Erosion Protection - FCSCM Chapter 9, Section 7.0 A. Riprap 1. Yes The riprap bedding is a granular bedding of the gradation and thickness indicated on the approved construction plans. 2. N/A A filter fabric was installed instead of granular bedding and is the material shown on the approved construction plans or was an approved equal. Provide documentation for an approved equal. 3. Yes The riprap is the gradation shown on the approved construction plans with a D50 of . 4. Yes The riprap thickness is as shown on the approved construction plans and extends to the horizontal limits shown. 5. Yes The riprap is buried to the depth indicated on the approved construction plans. (A minimum of 6 inches of soil is required.) B. Permanent Erosion Control Fabric - FCSCM Vol.1, Ch.7 1. Yes All fabric was installed per manufacturer’s specifications. 1/19 Page 2 of 2 IV. Other Permanent BMPs A. N/A All cut-off walls have been installed in accordance with the approved construction plans. (Cut-off walls are required for irrigation ditch crossings of storm drain pipes.) V. Extended Detention Basins A. N/A Installation of this facility was verified via inspection by a City-Stormwater Inspector at the point of installation of the water quality control box(es). Provide date of inspection and name of inspector: Included certification sheet(s): Please check the appropriate box(es) for the Low Impact Development (LID) facilities found on this site and complete the corresponding certification sheets. ☐ Permeable Interlocking Concrete Pavers ☒ Bioretention Cells (Rain Gardens) ☐ Sand Filters ☐ Vegetated Buffers ☐ Underground Infiltration ☐ Other LID – For certification of Dry Wells, Tree Filters, Constructed Wetland Channels & Ponds, etc., contact City Staff to determine requirements to exhibit the LID facility has been constructed and functions as intended per the approved drainage report. *Please provide photographic documentation of the installation of all stages of all LID facilities. **Please contact the City Stormwater Inspector at stormwaterinspection@fcgov.com to discuss inspection requirements for each LID facility and request inspections. ***All facilities being certified must be “clean” – free of sediment & construction debris – prior to certification or acceptance of the facility. Completed by: Name: Bill Tice Title: Foreman Email: bill@dunritex.com Phone: 970-590-5342 Company: Dunrite Excavation Address: 21506 Weld Cnty Rd 1 Berthoud, CO 80513 1/19 Page 1 of 2 Permeable Interlocking Concrete Pavers Item/Activity Yes No N/A Submittal Requirements Submitted?/Response Stormwater Inspection Pre-construction meeting was held with City-Stormwater Inspector to discuss installation, inspection, checklist, and protection from sedimentation ☐ ☐ ☐ Record date, inspector name, meeting location (i.e. DCP, initial erosion control inspection, etc.) Sub-surface inspection(s): Installation of this facility was verified via inspection by a City-Stormwater Inspector at the point of installation of the outlet, underdrain, geomembrane layer, and sub-base courses (per design in Final Plan Documents) ☐ ☐ ☐ Record date(s) of inspection and inspector’s name Surface inspection(s): Installation of this facility was verified via inspection by a City-Stormwater Inspector at the point of installation of the pavers and joint fill material ☐ ☐ ☐ Record date(s) of inspection and inspector’s name Excavation Heavy equipment did not encroach into the excavated area (prevents over-compaction) ☐ ☐ ☐ Bottom of cell was “ripped” after excavation ☐ ☐ ☐ Provide photographs before and after “ripping” Bottom surface of cell is flat and level ☐ ☐ ☐ Provide photograph Impermeable Liner Impermeable liner meets design specifications ☐ ☐ ☐ Provide specifications of delivered material Impermeable liner is attached to concrete perimeter wall ☐ ☐ ☐ Provide photograph Impermeable liner is buried with no exposure ☐ ☐ ☐ Any penetrations of the impermeable liner have been sealed and checked for water-tightness ☐ ☐ ☐ Provide photograph (if necessary) Edge Restraint and Concrete Cut-Off Wall The required edge restraint meets design specifications ☐ ☐ ☐ Provide specification of installation Concrete cut-off wall meets design specifications for: ☐ ☐ ☐ Provide specification of installation - Dimensions ☐ ☐ ☐ - Reinforcement ☐ ☐ ☐ - Footings ☐ ☐ ☐ Underdrain System Underdrain pipe meets design specifications ☐ ☐ ☐ Provide photograph At least one cleanout is provided per underdrain lateral ☐ ☐ ☐ Provide photograph 1/19 Page 2 of 2 Cleanout pipe is solid (not perforated/slotted) ☐ ☐ ☐ Provide photograph Cleanout covers are installed and watertight ☐ ☐ ☐ Provide photograph Verify the underdrain is NOT wrapped in geotextile fabric ☐ ☐ ☐ Provide photograph Verify there is no orifice plate on the underdrain outfall ☐ ☐ ☐ Provide photograph Underdrain integrity tested after backfilling using TV and/or water test ☐ ☐ ☐ Provide documentation of test results Aggregate Sub-base Course(e.g., #2/4): - Has 90% fractured faces - Is thoroughly washed (virtually free of fine sediment) - Is installed to the required design depth ☐ ☐ ☐ Provide load ticket, photographs, and record depth installed Basecourse (e.g., #57): - Has 90% fractured faces - Is thoroughly washed (virtually free of fine sediment) - Is installed to the required design depth ☐ ☐ ☐ Provide load ticket, photographs, and record depth installed Leveling Course / Joint Fill (e.g., crushed #89): - Has 90% fractured faces - Is thoroughly washed (virtually free of fine sediment) - Is dry screened - Is installed to the required design depth and to the top of the paver joints ☐ ☐ ☐ Provide load ticket, photographs, and record depth installed Aggregate materials are installed and compacted according to manufacturer’s and/or design specifications ☐ ☐ ☐ Provide photographs and documentation of compaction Protection During Construction PICP area is protected from construction site sediment, including runoff from the upstream catchment and construction equipment traffic ☐ ☐ ☐ Specify how the area was covered and/or otherwise protected to prevent construction runoff from entering the pavement Close Out Cracked/broken paver units have been removed and replaced ☐ ☐ ☐ Paver height offsets are no more than 1/4” between adjacent units & surface contains no deformations (depressions/settlement) exceeding 1/2" ☐ ☐ ☐ Upstream catchment is stabilized prior to diverting runoff into PICP system ☐ ☐ ☐ 1/19 Page 1 of 3 Bioretention Cells (Rain Gardens) Item/Activity Yes No N/A Submittal Requirements Submitted?/Response Stormwater Inspection Pre-construction meeting was held with City-Stormwater Inspector to discuss installation, inspection, checklist, and protection from sedimentation ☒ ☐ ☐ Record date, inspector name, meeting location (i.e. DCP, initial erosion control inspection, etc.) 8/25/2021 Martha, Larimer County Jail Rain Garden Location Underdrain and basecourse inspection(s): Installation of this facility was verified via inspection by a City-Stormwater Inspector at the point of installation of the outlet, underdrain, geomembrane layer, and base course (per design in Final Plan Documents) ☒ ☐ ☐ Record date(s) of inspection and inspector’s name 9/20/2021 and 9/21/2021 – Chandler City of Fot Collins Pea gravel and BSM inspection(s): Installation of this facility was verified via inspection by a City-Stormwater Inspector at the point of installation of the pea gravel and bioretention sand media ☒ ☐ ☐ Record date(s) of inspection and inspector’s name 9/22/2021 – Chandler City of Fort Collins Excavation Heavy equipment did not encroach into the excavated area (prevents over-compaction) ☒ ☐ ☐ Bottom of cell was “ripped” after excavation ☒ ☐ ☐ Provide photographs before and after “ripping” Pictures Show ripped bottom Bottom surface of cell is flat and level ☒ ☐ ☐ Provide photograph Bottom raked flat after ripping Excavated area is protected/surrounded by sediment/runoff control measures during construction ☒ ☐ ☐ Provide photograph Dirt Berm Intake Upstream catchment drains to inlet/bioretention cell per plan and flows are fully captured ☒ ☐ ☐ Forebay Forebay is installed according to design specifications ☐ ☐ ☒ Provide photograph There is a minimum 3” drop at the forebay entrance ☐ ☐ ☒ Provide photograph Forebay will drain fully and not hold standing water ☐ ☐ ☒ Outlet Structure/Overflow Emergency overflow elevation is confirmed ☒ ☐ ☐ Measure and record distance from overflow to top of media filter; provide photograph Overflow inlet elevation is set above bioretention media per plan ☒ ☐ ☐ Provide photograph 1/19 Page 2 of 3 Overflow inlet invert elevation is at least 3 inches below containment wall/berm (to direct overflow into inlet) ☒ ☐ ☐ Measure and record distance between inlet and top of containment wall/berm; provide photograph Overflow path and check dams, if used, are armored to protect from erosion and maintain elevations ☐ ☐ ☒ Provide photograph Impermeable Liner Impermeable liner meets design specifications ☒ ☐ ☐ Provide specifications of delivered material Impermeable liner is appropriately anchored ☒ ☐ ☐ Provide photograph Impermeable liner is buried with no exposure ☒ ☐ ☐ Any penetrations of the impermeable liner have been sealed and checked for water-tightness ☐ ☐ ☒ Provide photograph (if necessary) Underdrain System Underdrain pipe meets design specifications ☒ ☐ ☐ Provide photograph At least one cleanout is provided per underdrain lateral ☒ ☐ ☐ Provide photograph Cleanout pipe is solid (not perforated/slotted) ☒ ☐ ☐ Provide photograph Cleanout covers are installed and watertight ☒ ☐ ☐ Provide photograph Verify the underdrain is NOT wrapped in geotextile fabric ☒ ☐ ☐ Provide photograph Verify there is no orifice plate on the underdrain outfall ☒ ☐ ☐ Provide photograph Underdrain integrity tested after backfilling using TV and/or water test ☒ ☐ ☐ Provide documentation of test results Filter Media and Aggregate Reservoir aggregate layer (ASTM #57 or #67): - meets design specifications - is installed to the required design depth ☒ ☐ ☐ Provide load ticket, photographs, and record depth installed 8” Diaphragm aggregate layer (“Pea Gravel” with gradation ASTM #8, #89, or #9): - meets design specifications - is installed to the required design depth ☒ ☐ ☐ Provide load ticket, photographs, and record depth installed 4” Bioretention Sand Media (BSM) composition: - meets design specifications - is installed to the required design depth ☒ ☐ ☐ Provide load ticket, photographs, and record depth installed 18” BSM was “machine mixed” by supplier prior to delivery ☒ ☐ ☐ Provide load ticket BSM is installed flat and level ☒ ☐ ☐ Provide photograph Other Structural Components Containment wall/berm is continuous and level ☒ ☐ ☐ Except for west end and over storm RCP Pipe Landscaping 1/19 Page 3 of 3 Verify final landscaping is free of sod ☐ ☐ ☒ If sod is used, it must be shown to be “sand-grown” Final landscaping (non-floatable mulch) is flat and level ☐ ☐ ☒ Provide photograph Vegetation is planted according to landscape design specifications and final landscaping plan ☐ ☐ ☒ Provide photograph Verify that weed barrier is NOT installed ☐ ☐ ☒ Temporary irrigation installed ☐ ☐ ☒ If N/A, then verify that permanent irrigation is installed to establish/maintain vegetation Close Out Upstream catchment stabilized prior to diverting runoff into bioretention cell ☐ ☐ ☒ Berm will remain until area is finished and stabilized 1/19 Page 1 of 1 Vegetated Buffers Item/Activity Yes No N/A Submittal Requirements Submitted?/Response Construction Buffer area was sectioned off to eliminate site disturbance and compaction during construction ☐ ☐ ☐ Provide photograph(s) Level spreader has been installed per plan (if applicable) ☐ ☐ ☐ Provide photograph Soils in the buffer area have been amended ☐ ☐ ☐ Record soil amendment certification with Environmental & Regulatory Affairs Vegetation is planted according to landscape design specifications and final landscaping plan ☐ ☐ ☐ Provide photograph 1/19 Page 1 of 3 Sand Filters Item/Activity Yes No N/A Submittal Requirements Submitted?/Response Stormwater Inspection Pre-construction meeting was held with City-Stormwater Inspector to discuss installation, inspection, checklist, and protection from sedimentation ☐ ☐ ☐ Record date, inspector name, meeting location (i.e. DCP, initial erosion control inspection, etc.) Underdrain and basecourse inspection(s): Installation of this facility was verified via inspection by a City-Stormwater Inspector at the point of installation of the outlet, underdrain, geomembrane layer, and base course (per design in Final Plan Documents) ☐ ☐ ☐ Record date(s) of inspection and inspector’s name Pea gravel and filter media inspection(s): Installation of this facility was verified via inspection by a City-Stormwater Inspector at the point of installation of the pea gravel and filter media ☐ ☐ ☐ Record date(s) of inspection and inspector’s name Excavation Heavy equipment did not encroach into the excavated area (prevents over-compaction) ☐ ☐ ☐ Bottom of cell was “ripped” after excavation ☐ ☐ ☐ Provide photographs before and after “ripping” Bottom surface of cell is flat and level ☐ ☐ ☐ Provide photograph Excavated area is protected/surrounded by sediment/runoff control measures during construction ☐ ☐ ☐ Provide photograph Intake Upstream catchment drains to inlet/sand filter per plan and flows are fully captured ☐ ☐ ☐ Forebay (If Applicable) Forebay is installed according to design specifications ☐ ☐ ☐ Provide photograph There is a minimum 3” drop at the forebay entrance ☐ ☐ ☐ Provide photograph Forebay will drain fully and not hold standing water ☐ ☐ ☐ Outlet Structure/Overflow Overflow inlet elevation is set above sand filter media per plan (typically 1 to 3 feet) ☐ ☐ ☐ Provide photograph Overflow inlet invert elevation is at least 3 inches below containment wall/berm (to direct overflow into inlet) ☐ ☐ ☐ Measure and record distance between inlet and top of containment wall/berm; provide photograph 1/19 Page 2 of 3 Overflow path and check dams, if used, are armored to protect from erosion and maintain elevations ☐ ☐ ☐ Provide photograph Impermeable Liner (If Applicable) Impermeable liner meets design specifications ☐ ☐ ☐ Provide specifications of delivered material Impermeable liner is appropriately anchored to the perimeter wall ☐ ☐ ☐ Provide photograph Impermeable liner is buried with no exposure ☐ ☐ ☐ Any penetrations of the impermeable liner have been sealed and checked for water-tightness ☐ ☐ ☐ Provide photograph (if necessary) Underdrain System Underdrain pipe meets design specifications ☐ ☐ ☐ Provide photograph At least one cleanout is provided per underdrain lateral ☐ ☐ ☐ Provide photograph Cleanout pipe is solid (not perforated/slotted) ☐ ☐ ☐ Provide photograph Cleanout covers are installed and watertight ☐ ☐ ☐ Provide photograph Verify the underdrain is NOT wrapped in geotextile fabric ☐ ☐ ☐ Provide photograph Verify there is no orifice plate on the underdrain outfall ☐ ☐ ☐ Provide photograph Underdrain integrity tested after backfilling using TV and/or water test ☐ ☐ ☐ Provide documentation of test results Filter Media Filter media composition (e.g. ASTM C 33 Sand): - meets design specifications - is installed to the required design depth ☐ ☐ ☐ Provide load ticket, photographs, and record depth installed Pea gravel layer: - meets design specifications - is installed to the required design depth ☐ ☐ ☐ Provide load ticket, photographs, and record depth installed Filter Media is installed flat and level ☐ ☐ ☐ Other Structural Components Containment wall/berm is continuous and level ☐ ☐ ☐ Landscaping Verify final landscaping is free of sod ☐ ☐ ☐ If sod is used, it must be shown to be “sand-grown” Final landscaping (non-floatable mulch) is flat and level ☐ ☐ ☐ Provide photograph Vegetation is planted according to landscape design specifications and final landscaping plan ☐ ☐ ☐ Provide photograph Verify that weed barrier is NOT installed ☐ ☐ ☐ 1/19 Page 3 of 3 Temporary irrigation installed ☐ ☐ ☐ If N/A, then verify that permanent irrigation is installed to establish/maintain vegetation Close Out Upstream catchment stabilized prior to diverting runoff into sand filter cell ☐ ☐ ☐ 1/19 Page 1 of 2 Underground Infiltration Item/Activity Yes No N/A Submittal Requirements Submitted?/Response Stormwater Inspection Manufacturer’s representative pre-construction meeting: A pre-construction meeting was completed with the manufacturer’s representative and installers ☐ ☐ ☐ Record date and who was present at the meeting Pre-construction meeting was held with City-Stormwater Inspector to discuss installation, inspection, checklist, and protection from sedimentation ☐ ☐ ☐ Record date, inspector name, meeting location (i.e. DCP, initial erosion control inspection, etc.) Inspection(s): Installation of this facility was verified via inspection by a City-Stormwater Inspector at the point at which the chambers had been laid/prior to backfilling. Correct fabric placement was confirmed. ☐ ☐ ☐ Record date(s) of inspection and inspector’s name Excavation Heavy equipment did not travel across underground cell area during excavation (prevents over-compaction) ☐ ☐ ☐ Bottom of cell was “ripped” after excavation ☐ ☐ ☐ Provide photographs before and after “ripping” Bottom of cell is flat and level, or graded per approved grading plans ☐ ☐ ☐ Provide photograph Non-woven fabric is installed per manufacturer’s specifications and was not damaged during construction (around system) ☐ ☐ ☐ Provide photograph Woven fabric is installed per manufacturer’s specifications and was not damaged during construction (beneath chambers) ☐ ☐ ☐ Provide photograph Excavated area is protected/surrounded by sediment/runoff control BMPs during construction ☐ ☐ ☐ Provide photograph Impermeable Liner Impermeable liner meets design specifications ☐ ☐ ☐ Provide specifications of delivered material Impermeable liner is not exposed ☐ ☐ ☐ Any penetrations of the impermeable liner have been sealed and checked for water-tightness. ☐ ☐ ☐ Provide photograph (if necessary) Aggregate Foundation and embedment materials are installed and compacted according to design and manufacturer’s specifications ☐ ☐ ☐ Provide load ticket and photograph(s) Underdrain System 1/19 Page 2 of 2 Underdrain pipe meets design specifications ☐ ☐ ☐ Provide photograph At least one cleanout is provided per underdrain lateral ☐ ☐ ☐ Provide photograph Cleanout pipe is solid (not perforated/slotted) ☐ ☐ ☐ Provide photograph Cleanout covers are installed and watertight ☐ ☐ ☐ Provide photograph Verify the underdrain is NOT wrapped in geotextile fabric ☐ ☐ ☐ Provide photograph Verify there is no orifice plate on the underdrain outfall ☐ ☐ ☐ Provide photograph Underdrain integrity tested after backfilling using TV and/or water test ☐ ☐ ☐ Provide documentation of test results Manifold system Overflow weir elevation is set at/above water quality storm elevation ☐ ☐ ☐ Record weir elevation on survey Maintenance access is provided for each Isolator Row ☐ ☐ ☐ At least one inspection port has been provided for each Isolator Row (located in middle third of each row) ☐ ☐ ☐ Upstream catchment drains to inlet/intake properly ☐ ☐ ☐ Underground Detention Chambers All chambers were installed per approved Utility Plans and manufacturer’s specifications ☐ ☐ ☐ Photograph Close Out Upstream catchment is stabilized prior to diverting runoff into Underground Detention system ☐ ☐ ☐ All Isolator Rows, chambers, and pipes are cleaned and sediment/debris has been removed ☐ ☐ ☐ Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 09:07 am, 14th Oct, 2021 Submission ID 31717 Submitted on: 09:07 am, 14th Oct, 2021 Client Name: JE Dunn Construction Submitted by: William Tice 1574 Project Name: 5226 - Larimer County Jail (TE) Worker: William Tice 1574 Submission Location Link: https://www.google.com/maps/search/?api=1&query=40.566657,-105.0352457 Job Photos Job Photos: Array Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 09:07 am, 14th Oct, 2021 Submission ID 31717 Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 09:07 am, 14th Oct, 2021 Submission ID 31717 Description: Pictures show berm elevation shot on berm and over top of nyloplast overflows, showing that top of inlets are 6 inches below berm and 6 inches above sand Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 11:54 am, 12th Oct, 2021 Submission ID 31554 Submitted on: 11:54 am, 12th Oct, 2021 Client Name: JE Dunn Construction Submitted by: William Tice 1574 Project Name: 5226 - Larimer County Jail (TE) Worker: William Tice 1574 Submission Location Link: https://www.google.com/maps/search/?api=1&query=40.567032,-105.0360867 Job Photos Job Photos: Array Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 11:54 am, 12th Oct, 2021 Submission ID 31554 Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 11:54 am, 12th Oct, 2021 Submission ID 31554 Description: Pictures show the width and also that the bottom of the trench was not compacted, teeth marks are still visible. Middle was dug down at a slope near nyloplasts/outlets to maintain minimum of 2 inches of rock under pipe at plan elevations per City of Fort Collins specifications. Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:41 pm, 12th Oct, 2021 Submission ID 31572 Submitted on: 05:41 pm, 12th Oct, 2021 Client Name: JE Dunn Construction Submitted by: William Tice 1574 Project Name: 5226 - Larimer County Jail (TE) Worker: William Tice 1574 Submission Location Link: https://www.google.com/maps/search/?api=1&query=40.5550712,-105.1189499 Job Photos Job Photos: Array Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:41 pm, 12th Oct, 2021 Submission ID 31572 Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:41 pm, 12th Oct, 2021 Submission ID 31572 Description: Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:41 pm, 12th Oct, 2021 Submission ID 31572 Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:43 pm, 12th Oct, 2021 Submission ID 31573 Submitted on: 05:43 pm, 12th Oct, 2021 Client Name: JE Dunn Construction Submitted by: William Tice 1574 Project Name: 5226 - Larimer County Jail (TE) Worker: William Tice 1574 Submission Location Link: https://www.google.com/maps/search/?api=1&query=40.555078,-105.1189471 Job Photos Job Photos: Array Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:43 pm, 12th Oct, 2021 Submission ID 31573 Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:43 pm, 12th Oct, 2021 Submission ID 31573 Description: Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:43 pm, 12th Oct, 2021 Submission ID 31573 Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:45 pm, 12th Oct, 2021 Submission ID 31574 Submitted on: 05:45 pm, 12th Oct, 2021 Client Name: JE Dunn Construction Submitted by: William Tice 1574 Project Name: 5226 - Larimer County Jail (TE) Worker: William Tice 1574 Submission Location Link: https://www.google.com/maps/search/?api=1&query=40.5550886,-105.11895 Job Photos Job Photos: Array Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:45 pm, 12th Oct, 2021 Submission ID 31574 Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:45 pm, 12th Oct, 2021 Submission ID 31574 Description: Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:45 pm, 12th Oct, 2021 Submission ID 31574 Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:47 pm, 12th Oct, 2021 Submission ID 31576 Submitted on: 05:47 pm, 12th Oct, 2021 Client Name: JE Dunn Construction Submitted by: William Tice 1574 Project Name: 5226 - Larimer County Jail (TE) Worker: William Tice 1574 Submission Location Link: https://www.google.com/maps/search/?api=1&query=40.5550811,-105.1189432 Job Photos Job Photos: Array Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:47 pm, 12th Oct, 2021 Submission ID 31576 Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:47 pm, 12th Oct, 2021 Submission ID 31576 Description: Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:47 pm, 12th Oct, 2021 Submission ID 31576 Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:49 pm, 12th Oct, 2021 Submission ID 31578 Submitted on: 05:49 pm, 12th Oct, 2021 Client Name: JE Dunn Construction Submitted by: William Tice 1574 Project Name: 5226 - Larimer County Jail (TE) Worker: William Tice 1574 Submission Location Link: https://www.google.com/maps/search/?api=1&query=40.5550793,-105.1189583 Job Photos Job Photos: Array Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:49 pm, 12th Oct, 2021 Submission ID 31578 Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:49 pm, 12th Oct, 2021 Submission ID 31578 Description: Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:49 pm, 12th Oct, 2021 Submission ID 31578 Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:51 pm, 12th Oct, 2021 Submission ID 31579 Submitted on: 05:51 pm, 12th Oct, 2021 Client Name: JE Dunn Construction Submitted by: William Tice 1574 Project Name: 5226 - Larimer County Jail (TE) Worker: William Tice 1574 Submission Location Link: https://www.google.com/maps/search/?api=1&query=40.5550793,-105.1189583 Job Photos Job Photos: Array Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 05:51 pm, 12th Oct, 2021 Submission ID 31579 Description: Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 09:29 am, 13th Oct, 2021 Submission ID 31628 Submitted on: 09:29 am, 13th Oct, 2021 Client Name: JE Dunn Construction Submitted by: William Tice 1574 Project Name: 5226 - Larimer County Jail (TE) Worker: William Tice 1574 Submission Location Link: https://www.google.com/maps/search/?api=1&query=40.5614318,-105.0356481 Job Photos Job Photos: Array Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 09:29 am, 13th Oct, 2021 Submission ID 31628 Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 09:29 am, 13th Oct, 2021 Submission ID 31628 Description: Pictures show south berm grade in relation to nyloplast overflow elevations, berm grade is 6 inches higher than overflow elevation. Overflow elevations are 6 yo 7 inches above finish grade of sand. Job Photos Dunrite Excavation 5300 Longs Peak Dr Berthoud, CO 80513 Date of Submission 09:29 am, 13th Oct, 2021 Submission ID 31628 2/14/17 Page 1 CERTIFICATION OF LOT GRADING Pursuant to Fort Collins City Code § 26-544 & City Land Use Code § 3.3.2 (e) Date: Address: Lot: Block: Subdivision: Permit Application #: Larimer County Parcel #: Larimer County Reception #: (on development agreement) I, (print) , a Colorado registered professional engineer, verify that construction of all stormwater facilities and grading is complete and hereby submit this certification. Please answer the following questions by initialing the appropriate response. For each question initialed “No,” attach an explanation detailing how this will affect stormwater drainage for this lot and any adjacent lots. 1.Certification includes attached Stormwater-approved grading plan. (NOTE: City’s Building Department does not approve grading plans). 2.Certification includes the attached as-built survey dated (must be within 60 days of the date the certification is submitted) accurately and truthfully depicting elevations for: Top of foundation/finished floor Finished grade on each side of the structure Quarter points along each lot line (not more than 50 feet apart) Break points/high points Swales Berms Retaining walls Air conditioning pads Window wells Any other appurtenance(s) within an easement 3.All elevations are within a 0.2 foot tolerance of the approved grading plan. 4.The top of foundation is at least 6 inches above the highest grade surrounding the structure. 5.There is a minimum grade of 5% away from the structure within the first 5 to 10 feet adjacent to the residence. 6.All slopes meet or exceed the minimum requirement of 2% (1% is acceptable on single family lots when the swale is draining the runoff from only two adjoining properties) and are not steeper than 33% (3:1). 7.All flow lines of stormwater drainage swales are a minimum of 6 inches below the elevation of ground adjacent to the structure and will direct drainage as shown on the Stormwater-approved grading plan. 8.All downspout locations and discharge directions are shown on the as-built survey. Runoff is directed into an appropriate drainage system or lot line swale, and it is not directed onto neighboring properties. No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes 07/17/2023 Midpoint Campus 2405 Midpoint Dr Fort Collins, CO 80525 8720240902 2 20200050637 Mark D. Thornbrough 7/11/2023 2/14/17 Page 2 9.A smooth transition with no vertical offset (step) in grade is provided at the lot line to all adjacent properties. 10.The grading of this lot does not adversely affect neighboring properties or City infrastructure. 11.Landscaping has been completed prior to survey. If not, please indicate who will be responsible for completing landscaping: 12.Final site cleanup has been completed. 13.I personally visited the site as part of the certification process, and in my professional opinion, the as-built survey is an accurate representation of the site conditions.. No Yes No Yes No Yes No Yes No Yes 14.Based on this information, I certify that (check one): □The elevations and drainage patterns of the lot/site are in substantial conformance with the City approved drainage and grading plan for the property (information attached). □The elevations and drainage patterns of the lot/site as measured are in general conformance with the City approved drainage plan with exceptions (information attached). In my professional judgment the elevations and grading of the lot/site as constructed are functionally adequate and equivalent to the specifically approved drainage plan, and will affect stormwater drainage on and off the lot/site in a manner consistent with the approved drainage plan. Name: Email: Phone: Company: Address: NOTE: A complete certification must be submitted at least two weeks prior to a request for a Certificate of Occupancy for the lot/site, including, but not limited to, drawings of the lot/site showing the approved design and as-built surveyed elevations of all structures, drainage and grading features, written information/explanation of discrepancies, and other information necessary to confirm the above certification to: Email (preferred) WaterUtilitiesEng@fcgov.com Mailing Address Fort Collins Utilities ATTN: Water Utilities Engineering 281 North College Avenue Fort Collins, CO 80521 Questions? 970-221-6700 PE Stamp Sign and date 8/31/2023 Zak George Landscaping 4 Mark D. Thornbrough mthornbrough@martinmartin.com 303.638.4023 Martin/Martin, Inc. 12499 W Colfax Ave Lakewood, CO 80215 Mark D. Thornbrough Digitally signed by Mark D. Thornbrough Date: 2023.08.31 15:26:32-06'00' FT COLLINS CERTIFICATIN OF LOT GRADING LARIMER COUNTY JAIL EXPLANATIONS AUGUST 18, 2023 To the City of Fort Collins, This letter serves as a supplement to the Certification of Lot Grading as required by the Fort Collins City Code § 26-544 and City Land Use Code § 3.3.2 (e). The document is structured to follow the Certification’s formatting and provides justification for items that were marked as “No.” 3. This item has been marked as “No” as not all as-built spot elevations are within 0.2 feet of the design grading plan. All elevations outside the 0.2-foot tolerance of the design grading plan have been evaluated and determined to not have an adverse effect on the intent of the grading plan design. 4. This item has been marked as “No” as there are several locations around the building where doorways and adjacent pavements or grading constraints do not allow for a 6-inch difference between the top of foundation and surrounding grades. Each of these areas have positive drainage away from the building to facilitate proper drainage and the intent of the design. 5. This item has been marked as “No” as there are several locations around the building where adjacent pavements or elevation constraints do not allow for 5% grades away from the structure, for example at ADA walkways, entrances, or other paved areas. These areas as sloped as applicable to have positive drainage away from the building to nearby storm infrastructure and meet the intent of the design. 6. This item has been marked as “No” as some ADA accessible walks were designed at 1.8% slopes to allow for constructability tolerances. No slopes on the project site are known to be steeper than 33%. 11. This item has been marked as “No” as there are areas of reseeding and landscaping that are still underway at the time of the site visit for this certification. These are being completed by Zak George Landscaping. 12. This item has been marked as “No” as there are temporary BMPs such as inlet protection and silt fencing that were present at the site at the time of the site visit for this certification. These were necessary at the time of the site visit and are to be removed once final site stabilization is complete. FT COLLINS OVERALL SITE AND DRAINAGE CERTIFICATION August 15, 2023 P a g e 2 | 2 Appendix Items 1. City Stormwater Approved Grading Plan 2. As-built Survey 3. As-built Grading Plans KIN G SUR V E Y O R S 65 0 E . G a r d e n D r i v e | W i n d s o r , C o l o r a d o 8 0 5 5 0 ph o n e : ( 9 7 0 ) 6 8 6 - 5 0 1 1 | e m a i l : c o n t a c t @ k i n g s u r v e y o r s . c o m 1 FOR JE DUNN CONSTRUCTION AS-BUILT SURVEYOf LARIMER COUNTY JAIL DOWNSPOUT KIN G SUR V E Y O R S 65 0 E . G a r d e n D r i v e | W i n d s o r , C o l o r a d o 8 0 5 5 0 ph o n e : ( 9 7 0 ) 6 8 6 - 5 0 1 1 | e m a i l : c o n t a c t @ k i n g s u r v e y o r s . c o m 2 FOR JE DUNN CONSTRUCTION AS-BUILT SURVEYOf LARIMER COUNTY JAIL DOWNSPOUT KIN G SUR V E Y O R S 65 0 E . G a r d e n D r i v e | W i n d s o r , C o l o r a d o 8 0 5 5 0 ph o n e : ( 9 7 0 ) 6 8 6 - 5 0 1 1 | e m a i l : c o n t a c t @ k i n g s u r v e y o r s . c o m 3 FOR JE DUNN CONSTRUCTION AS-BUILT SURVEYOf LARIMER COUNTY JAIL KIN G SUR V E Y O R S 65 0 E . G a r d e n D r i v e | W i n d s o r , C o l o r a d o 8 0 5 5 0 ph o n e : ( 9 7 0 ) 6 8 6 - 5 0 1 1 | e m a i l : c o n t a c t @ k i n g s u r v e y o r s . c o m 4 FOR JE DUNN CONSTRUCTION AS-BUILT SURVEYOf LARIMER COUNTY JAIL