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HomeMy WebLinkAboutSite Certifications - 11/02/2015CG OWEN CONSULTING GROUP, INC. SIS036a4 October 8, 2015 City of Fort Collins Stormwater Department 700 Wood Street Fort Collins, CO 80522 Attention: Mr. Wes Lamarque RE: Discovery Fellowship Church Stormwater Detention Basin Dear Wes, Project File #: 12-389 As a follow-up to our recent meeting, attached is a completed Overall Site Drainage Certification form for the site drainage improvements recently implemented on the property of Discovery Fellowship Church. The project included addition of a new wing onto the existing building, which increased the impervious area of the site, site grading modifications to accommodate the building addition, and construction of a stormwater detention basin to remedy a deficiency in the original development of the site. The drainage design for the site improvements, which reflects the existing development and building expansion, as well as the City's updated drainage design criteria, is documented in the "Final Drainage Report, Discovery Fellowship Church Facilities Expansion" (Owen Consulting Group, Inc., Nov. 2012). Drainage improvements are shown on the Site Grading and Drainage Improvements drawings, approved by the City in October 2013. Construction of the site drainage improvements, which were limited to the new detention basin, took some time to complete, and several iterations to remedy construction deficiencies. The final configuration of the as -constructed detention basin is somewhat different than that shown on the approved construction drawings, but the as -constructed configuration does provide the required detention capacity, and will function as intended. The configuration and details of the as -constructed detention basin are shown on the attached drawings. The depth - capacity relationship within the as -constructed facility is shown on the attached Detention Basin Depth -Capacity Correlation exhibit. Upon review of the as -built grading plan of the detention basin, you will note that there is some lack of uniformity in the interior earth slopes, and that most of the slopes are slightly, but not significantly, steeper than the 4:1 criteria that is recommended. There is a small area, in the northwest corner of the detention basin, where the slopes are considerably steeper than 4:1. Excavation in this area was ultimately restricted by the root system of a mature Austrian Pine tree that was to be preserved. While the tree roots impeded extension of the excavation to create more stable slopes, those same tree roots will stabilize the surrounding soils and inhibit erosion of the slopes. The new grass, which is becoming well established on all the surfaces of the detention basin, will also stabilize those surfaces, and erosion is expected to be minimal. The church maintenance personnel will mow the grass regularly, remove any debris that accumulates in the detention basin and repair any minor erosion that may occur prior to the 3715 Shallow Pond Dr., Fort Collins, CO 80528 • Phone (970) 226-0264 • Fax (970) 226-3760 Mr. Wes Lamarque RE: Discovery Fellowship Church — Detention Basin Certification October 8, 2015 Page 2 of 2 vegetation becoming fully established. The surface slopes of the floor of the detention basin, as well as along the concrete trickle pans, exceed the required minimums. Fill that was placed to form the upper portions of the embankments along the north and east perimeters of the detention basin was compacted as it was placed, but no compaction tests were conducted to confirm the in -place density. The fill material is, for the most part, above the normal water levels that will be experienced in the detention basin, so there is little if any concern regarding any possible instability of these fill areas. The outlet control structure for the detention basin was constructed essentially as designed, and the flow control orifices are sized to limit the release of accumulated runoff from the facility to the allowable rates presented in the Final Drainage Report. In summary, while the as -constructed detention basin is somewhat different in shape than the approved design, the facility is adequately sized and will fulfill the intent of the design. The detention basin will remain the property of the church and will serve only the church property and the small off -site area that is tributary to the church property. Accordingly, we respectfully request that the City grant acceptance of the as -constructed detention basin so that the church may obtain its permanent Certificate of Occupancy for the building expansion. If you have questions regarding any of the submitted materials, please do not hesitate to contact me. Thank you for your attention to this matter. Yours truly, Project Name: Discovery Fellowship Church Date: 10-08-15 Building Permit Numbers: B13 (for commercial or multi -family) Per the requirement in Fort Collins Stormwater Criteria Manual (FCSCM) Volume 1, Section 6.11, please fill in all applicable items in this Certification Form for Commercial, Multi -Family, and Overall Single Family sites. Caution: several of the items need to be verified during construction. A copy of the approved grading plan must be submitted with the as -built grading plan. (It is preferred to have the as -built elevations 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 that is being certified. • If any blanks are "No" you must provide an explanation on an attachment referencing the item number below. Attach an explanation or description of the as -built condition for any of the items listed or for anything that is not listed but is shown on the approved construction plans. Please provide an As -Built Redline or Mylar drawing showing the following: I. Water Quality & Quantity Detention Basin Certification - FCSCM Vol.2, Ch.10 For multiple detention basins on a site, provide the following for each basin separately. A. Volume: Yes As -built topographic verification is attached at one foot contour intervals (or less) and volume verification calculations for the water quality capture volume and the 100 year detention storage volume. 1. Yes Detention basin topography was prepared by a professional land surveyor registered in the state of Colorado. 2. No Both proposed and as -built contours are shown on the same plan sheet (dashed lines for proposed and solid lines for as -built). The as -built contours are somewhat different than the design contours, so two separate plans are included. 3. Yes 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. The approved construction plans did not include S, L, a: c i . , c elevations at key locations are shown on the as -built drawings. 4. Yes Stage -storage -discharge tables are provided on a separate document. 5. Yes As -built verification is attached showing detention basin meets state regulation drain times. B. WQ & Quantity Detention Basin Grading: Yes Attached is as -built verification that there is a 2% (min.) 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 must still meet the 2% (min.) grade requirement to drain into it. 9115 Page 1 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 2% (min.) grade in the flow-line(s) of the detention basin. The flattest as -built grade is b. Yes Concrete Pan for low flow in detention basin. • There is a concrete pan installed meeting the grades as shown on the approved construction plans. (Show as -built spot elevations.) � t eye. lil1L-u - ' _ : .:Ic' tl� i,le= e.. t= C. Soft Pan for low flow in detention basin. • Verify and document the soft pan material gradation, trench width, and depth. This will need to be verified during installation by the engineer. Picture documentation preferred or engineer's statement of visual inspection and compliance. (Choose applicable choice below.) o There is a soft pan with an underdrain installed meeting 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: Yes The as -built side slopes of the detention basin have been calculated and are shown. Indicate the slide slope with an arrow and a numerical value beside it (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. If there was a variance granted for steeper slopes during the design process you must provide the variance documentation. 3. Compaction: No All berms and embankments meet the compaction requirements as specified in the project geotechnical report or comply with the City's standard. The City's standard requirement 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)." This is an item requiring verification during construction. Provide testing log from contractor/engineer. Some fill was placed to form the upper portions of perimeter embankments. The fill material was compacted as it was placed, but no compaction tests were conducted to confirm in -situ densities. 4. Spillway Certification: The following items must be field verified: a. Yes The location of the spillway is indicated on the as -built plan. b. Yes The width of the spillway is indicated on the as -built plan. c. Yes The elevation(s) of the spillway is shown on the as -built plan. d. Yes There is a concrete ribbon defining the location and grade of the spillway. e. Yes There is downstream scour protection in the spillway as per the construction plans. Indicate type: Buried riprap D50 = 9" (riprap size "D50" gradation and bedding type, geotextile, buried riprap with 6" inches of bury, etc.) f. Yes There are no obstructions in the spillway such as trees, bushes, sidewalks, landscape features, rocks, etc. 9/15 Page 2 5.Outlet Structure Certification a. Yes The orifice plate for the approved release rate is installed with the correct size and location of the orifice. b. Yes The orifice plate for the water quality outlet is installed with the correct hole size, number of rows, and columns of holes. c. Yes The bottom hole on both the water quality and quantity outlets are at the bottom of the plate so that there is no water being ponded in front of the plate. d. Yes The well screen is the correct material and is installed as shown on the construction plans. e. Yes 100 year overflow grate elevation is 4928.12 . (Elev. C on detail D-46) f. Yes The top elevation of the water quality capture volume is 4927.20 . (Elev. B on detail D-46) g. Yes Overflow grate is made of the correct material, has the correct bar spacing, is hinged at the top, and bolted at the bottom. In. Yes 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. 11. Channels/swales - FCSCM Vol.l, Ch.7, Sect.3&4 A. Capacity: N/A The as -built capacity of all the major channels and swales has been verified and they meet or exceed the 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 needs to write a justification and propose mitigation for each instance or have the issues corrected. If variances to these criteria have been approved previously and they 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 (i.e. drop structures, riprap, TRMs, etc.). Pictures and verification of the materials used need to be included 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.) Ill. Pipes (aka storm drains) - FCSCM Vol.l, Ch.6, Sec. 4 A. Storm Drain Pipe Capacity: NIA The as -built capacity of all pipes installed on this project have been verified and meet or exceed the capacity requirements shown in the approved drainage study for this project. 9/15 Page 3 1. All pipe sizes and materials of the storm drainpipes 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: N/A All pipes are installed in accordance with the approved construction plans. 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. (Please list any of these on a separate sheet and attach it to this certification.) 4. The pipe trenches have been compacted in accordance with Section 02225-3.07.A.1. of the Fort Collins Development Construction Standards. (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.) IV. Concrete Pans - FCSCM Vol.1, Ch.7, Sec.4.1.3.4 A. Construction/Installation: Yes All concrete pans have been constructed in accordance with the approved construction plans. 1. Yes The concrete pans are the correct size width as shown on the approved construction plans. 2. Yes The longitudinal slope 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. The (-IF t-d rlca! s ope o`the pans I= -eater tl-ari �'1Fne�_! 3. Yes The cross-section of the pan is as shown on the construction plans. (Of particular concern is that the pan cross-section is "V" shaped, meeting the side slope shown on the detail.) 4. No The concrete pans area 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.) The approved construction drawings show a 4" thick, unreinforced pan. 5. Yes The spot elevations shown on the concrete pan(s) have been verified and are shown on the as - built drawings. 9/15 Page 4 V. Storm Drain Inlets - FCSCM Vol. 1, Ch.6, Sec. 3 A. Construction/Installation: N/A All storm drain inlets have been constructed in accordance with the approved construction plans. 1. The size and type of inlets are consistent with the inlets shown on the approved construction plan. Indicate by writing in "Verified" 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 ft. 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. If not, attach an explanation or justification. VI. Culverts - FCSCM Vol.2, Ch.9 A. Construction/Installation: N/A All culverts have been constructed/installed in accordance with the approved construction plans. 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 to 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: N/A All sub -drains shown on the construction plans have been installed in accordance with those plans. Sub -drains installed with the sanitary sewer are to be verified on the sanitary sewer plan and profile sheets of the construction plans. (Note: sub -drains installed after the plans were approved need to be indicated on the as -built plans also.) 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. 3. The minimum cover requirements are being provided. 9/15 Page 5 4. The cleanouts have been installed at the locations shown on the construction plans and are accessible for cleaning. (Cleanouts can be buried if they are not buried more than 6 inches and there are markings to locate their locations.) 5. The backfill materials for sub -drains are as shown on the approved construction plans. (This includes the depth and width as shown.) 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 only accepted if approved prior to installation.) VIII. Curb Cuts A. Construction: _N/A All curb cut openings are constructed in accordance with the approved construction plans. 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: N/A 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" 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 A. Construction: No All common open spaces have been graded in accordance with the approved construction plans. Overlot grading is generally in accordance with the approved plans, but localized revisions were made during construction to suit the requirements of the building expansion. 1. N/A 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. 2. N/A 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, 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 9/15 Page 6 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. N/A All turf reinforcement mats (TRMs) have been installed as shown on the approved construction plans, and the slopes are stabilized. XI. Riprap - FCSCM Vol.1, Ch.7, Sec.4.4.4.3 A. Construction: —N/A All riprap has been installed in the locations and sizes indicated on the approved construction plans. 1. The riprap bedding is a granular bedding of the gradation and thickness indicated on the approved construction plans. 2. 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. The riprap is the gradation shown on the approved construction plans with a D50 of 4. The riprap thickness is as shown on the approved construction plans and extends to the horizontal limits shown. 5. The riprap is buried to the depth indicated on the approved construction plans. (A minimum of 6 inches of soil is required.) XII. Permanent Erosion Control Fabric - FCSCM Vol.1. Ch.7 A. Construction: N/A All fabric has been installed in the locations and sizes indicated on the approved construction plans. 1. All fabric was installed per the details on the approved construction plans. 2. All fabric was installed per manufacturer specifications. XIII. Post -Construction Site Cleanup - FCSCM Vol.3, Ch.7 A. Construction: Yes All construction debris and obstructions of any kind have been removed from drainage paths. 1. Yes All construction debris has been removed except in staging area(s) designated on the erosion control plan. 2. Yes All ruts have been smoothed out in all construction areas. 3. Yes All areas needing reseeding have been identified and stabilization has been coordinated with the Erosion Control Inspector. Note the area needing stabilization in the narrative. XIV. Certification of Other Permanent BMPs - FCSCM Vol.2, Ch.B. Sec.2 & FCSCM Vol.2, Ch.12 A. N/A The construction of channel drop structures is in accordance with the approved plan both in location, horizontal dimensions, and cross-section. B. 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 and at the end of flared end sections.) 9/15 Page 7 XV. Certification of LID and Water Quality Facilities - FCSCM Vol.3. Ch.4 A. N/A Attached are the certifications for Low Impact Development (LID) or other water quality facilities, along with their certification check sheets, pictures, and other required documentation. XVI. Certification of Erosion Control Measures A. Certification of Erosion Control Measures is a separate process to be completed with the Environmental Regulatory Affairs Erosion Control Inspector. However, if at the time of preparing this certification there are any erosion control measures needing maintenance, please note them in the narrative and report them to the Erosion Control Inspector at 970-221-6700. XVII. Statement of Compliance A. This certification is signed and stamped. By signing this form, the engineer(s) attests that they have inspected the site, and to the best of their knowledge, the as -built conditions of the drainage facilities are as described in the above form and in the as -built plans enclosed. 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. XVIII. Sienature and Stamp by a Colo rado-Reeistered Professional Eneineer Engineer's contac n m ion: Sig Name: Larry Owen Email: larrycowen@comcast.net Phone: (970) 226-0264 Company Name: Owen Consulting Group, Inc._ Company Address: 3715 Shallow Pond Dr., Fort Collins. CO 80528 City of Fort Collins Willies 9/15 Page 8 DETENTION BASIN DEPTH -CAPACITY CORRELATION Project No.: 12-389 Project Name: Discovery Fellowship Church Basin I.D.: On -site Detention Basin (AS -BUILT) Date. 9129/15 Contour Plan Depth Volume Cummulative Elevation Area Interval Increment Volume amsl s.f. ft c.f. c.f. ac-ft 4925.00 20 0.00 0.00 0.00 0.000 4926.00 2,007 1.00 742.35 742.35 0,017 4927.00 41241 1.00 3,054.78 3,797.13 0.087 4928.00 5,143 1.00 4,684.67 8481.81 0.195 4929.00 6.426 1.00 5,772.60 14,254.41 0.327 4930.00 7,751 1.00 7,077.72 21,332.13 0.490 A^1 A ^^ -The required aggregate detention volume of 0.319 ac-ft for the 100-yr storm attenuation plus WQCV is satisfied at a water surface elev'n of: 4928.94 - The required detention volume of 0.086 ac-ft for the WQCV is satified at a water surface elev'n of: 4926.98 Stormwater Detention and Infiltration Design Data Sheet Stormwater facility Name: Discovery Fellowship Church Facility Location &Jurisdiction: City of Fort Collins User (Input) Watershed Characteristics Watershed Slope= 0.063 ft/ft Watershed Length -to -Width Ratio= 2.10 L:W Watershed Area = 5.61 acres Watershed Imperviousness= 30.4% percent Percentage Hydrologic Soil Group A = 0.0% percent Percentage Hydrologic Soil Group 8 = 23.6% percent Percentage Hydrologic Soil Groups C/D = 76.4% percent Location for 1-hr Rainfall Depths (use dropdown): U,,, Input User Input: Detention Basin Characteristics WQCV Design Drain Time = 40.00 hours After completing and printing this worksheet to a pelf, go to: https //mapenuce.digitalciataser ices.com/gvh/?viewer-6wdif, create a new stormwater facility, and attach the pelf of this worksheet to that record. Design Storm Return Period = One -Hour Rainfall Depth = Calculated Runoff Volume = OPTIONAL Override Runoff Volume = Inflow Hydrograph Volume = Time to Drain 97% of Inflow Volume = Time to Drain 99% of Inflow Volume = Maximum Ponding Depth = Maximum Ponded Area = Maximum Volume Stored = Routed Hydrograph Results r rr � r rr r rr rr rr rr tr ® rr WQCV 2 Year 5 Year 10 Year 25 Year 50 Year 100 Year 0.53 0.82 1.15 1.40 1.80 2.18 2.86 0.071 0.103 0.220 0.324 0.519 0.679 0,974 0.070 0.102 0.219 0.324 0.519 0.679 0.974 1 1 1 1 2 2 2 1 1 1 1 2 2 2 O.fil 0.82 1.51 2.04 3.00 3.72 4.30 0.028 0.038 O.D72 0.098 0.118 0. 139 0.157 0.009 0.015 0.053 0.099 0.202 0.294 0.380 acre-ft acre-ft acre-ft hours hours acres acre-ft SDI Design_Data 30-07-15, Design Data 10/8/2015, 8:17 AM IStormwater Detention and Infiltration Design Data Sheet 5 4.5 4 35 C 3 W V 0 2.5 z 6 2 1.5 1 OS a 0.1 1 10 100 DRAIN TIME DWI SDI_Design_Data 10.07-15, Design Data 10/8/2015, 8:17 AM 40D 2940'N 40° 2933"N a Hydrologic Soil Group—Larimer County Area, Colorado Y ,� (Discovery Fellowship Church) . r"I `'l7P?AWw 494760 494780 49M 494M 494840 494860 3 M M Map Scale: 1:1,140 If pnnted on A portrait (8.5' x 11") sheet. Meters N 0 15 30 60 90 Feet A 0 50 100 200 300 0 Map projection: Web Mercer Corner coordinates: WGS84 Edge bm: U M Zone 13N WG554 I cnA Nah4ral Resources WP.h Snil Stirvev 494880 494900 3 494920 W 401 29 40' N it— W 1 494920 3 M M 10/7/2015 40° 29 33"N 0 m `0 0 U m m r, Q U C L J U 0 U a t `m 3 E o L LL J > O U 0 U O O T o c� y 0 �o o �m I^ m m m o. d OT 0 m U p U m Z m p O O rnE (D cl � t �r N m m 0 o NoZ a .mp m0 'o c U E .0 0yO E(D r 2NJ 0zn-0 zo� E Gy 'p Ea 0 0 ¢ aN N °LmD m Q CL N° m cy am n m mm«0 o Q m E 0 C m d nm al CL la la NO 'E�yOm>m LL a «toyadrm o o Z Eo U m 0 n -0 E Z o vA N o N 0 a w' 0m o N Ovn 0o ` E c y° o m o 'D E m y a 0 Q �d m n «� a—`° � CC E aoay mm m Z� z) E a�Q•�'•° d Cn f Voai 0 a) ai NN E'T ocO v.5 N~ c.ZO O ai m �O N ��0 wmyO Q v'.y•N--' LC N C m N m >E , m CM E o46) 6m y m 0 m1vEY �VpyEc o E m m ao cl0 . y = CcaLo 0m 0) aFt 3m w E a N E oo (nU m a v Qc Fm .N.. N N o�rEEc� ZOp tN 0 N v n m N 0 U L m t O v m N m B m 0 E a` o 6 C O N b z (0w c N !n � c t0 y d c � ❑ ❑ ❑ ❑ t« `/ W W0 1 \ 0 3 m W J IL n n Q > � s C s C d N C O O O 0 Q ` O O N N VI N a m U C a m U Q 4 0 0 a m Q rn Q m U 0 Z m Q m U Z 0 Z pi G m ©o s <�❑❑❑❑❑❑❑❑N N❑ �IT m 2 7 Z Hydrologic Soil Group—Larimer County Area, Colorado Discovery Fellowship Church Hydrologic Soil Group Hydrologic Soil Group— Summary by Map Unit— Larimer County Area, Colorado (C0544)' "Map unit symbol Map unit name Rating Acres in AOI, PB,rcentof A01 54 Kim loam, 3 to 5 percent slopes B 1.3 23.6% 90 Renohill clay loam, 3 to 9 percent slopes D 4.2 76.4% Totals for Area of Interest 5.5 100.0% Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long -duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D; and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained orwell drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink -swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. 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DISCOVERY FELLOWSHIP CHURCH A portion of the Northeast Quarter of Section 13, Township 6 North, Range 69 West of the 6th Principal Meridian, City of Fort Collins, County of Larimer, State of Colorado DRAINAGE & DETENTION DETAILS STEEL OWWNX r➢NEO INTO CONCRETE SEES STAINLESS STEM NfJlpt WILTS OR INM1AYIRAM INSIDE ON TOP AND SEES WELLSCREEN SECTION A -A Lisp rol l Id WARR 9WLm (Trot BLUE Dm). SLL TAME e I/4- (IN) IUAO( STEEL ROW COIIIBLL PUM HOLES RDW or /� (ryp') �AVENUNUE eXIT STEEL NCEFS TO M n J/ IA2Rf OF PMIE FLOW CONTROL PLATE SECTION B-B I/R' RATE WELDED TEASE! MAT( (NOTE s) ELO_C INI2' O.C. TO GPATI. WITH A W S SECTION D-D B/B'AB' THREADED BOLT I TO FASTEN CRATE DOWN 101F'7 WrGT MEE WELL SCREEN NO. 9S J0u' GENERAL NOTES (Us. FILTER 4NNIESS _ �� — iTEEL OR EQUAL) I. Wlarl[ Slwi H CLASS B. ,u: BE etsla-IEEE OR HEI%Sr. .r FLOW CONTROL 2 If1XEWCn.' BV5 SOUL M GROW NAND NB EO , MU SOUL HATE HIME A WOMEN 2' gGRW2. 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BOTTOM EDGE OF ORIFICE PLATE TO BE SET FLUSH WITH FLOOR OF OUTLET CONTROL BOX 100-YR ORIFICE DETAIL SCALE: PUTS O 5 16' THICK HOT -DIPPED GALVANIZED STEEL PLATE BORE OF 15 DR. DISCHARGE PIPE BEYOND 13a18" DR. ORIFICE (SEE DETAIL BELOW) O I' DR. ANCHOR BOLT HOLE (A REG D) FOR V DIA. EXPANSION BOLT. 100-YR STORM ATTENUATION ORIFICE PLATE SCALE: PIS DETENTIONS NCREST AELEW ABS0.00I sa sell a A % LT MR "PI SLOPE VARIES 2R SLOPE VARIES AM SECTION A'CONCRUE TRICKLE PAN SCALE:NTS TOP OF SPILLWAY SILL BUSY. TWB% 3. C NBARCORIMMS(2REMS.I "XIWE R02A'L}C. SINGUE CURTAIN O 6' SILL SECTION SILL ELEVATION SCALE: 1'.IPV EMERGENCY SPILLWAY SILL SCALE: NITS SCALE: NITS TURES BE IN ACCORDANCE WPH THE CITY OF FORT COLLINS NUAL. CRY ACCEPTANCE SHALL NOT RELIEVETHE 'ONSIBILRY FOR ERRORS, OMISSIONS OR DESIGN FOR WHICH THE CITY IS HELD HARMLESS. CITY OF FORT COLLINS, COLORADO UTILITY PLAN APPROVAL BY._TeWastewater Um_fiuy Date 0 DISCOVERY FELLOWSHIP CHURCF A portion of the Northeast Quarter of Section 13, Township 6 North, Range 69 West of the 6th Principal Meridian, City of Fort Collins, County of Larimer, State of Colorado SITE GRADING & DRAINAGE IMPROVEMENTS PROPERIY BOUNDARY _ N 1T 23" W 380.09 IL \�4929 `4927- \4937 492 4g32 E%)STING AUSiRIAN PINE TREE � C Q W tJ 92= 4927 -4926 2' Concrete Pon SI �j 4C IENCYOVERR O S�KL AYW/COIILRETE SILL LENBTx.IT. \ -� SANITARY SEWER MANIPLE RIM = 09JA.02 `— STORM SEWER MANIKKE RIM •49W 05 LID � I\ -P EL.69¢1.59 )SOURCE UNKNOWN) O 01 co w w o ' z RIP RAP IB•ADS CULVERT K.aWebt (SOURCE UNKNOWN) :IA 15 N SEE PLANS SCALE: 1L 10'-W NORTH L,6 11 BLK��� O'1I�IT o s' ,o' zR'ao'5 OPIIDN4 CONCRETE WNG WALL TYPJ AND PC (END OF PC 10 MATCH END OF WING WALL) r 6' 1/1' T: A wELCED 10 'xi RIN ]/016' THRFMEO BOI] i0 FASTEN GPATE GOWN I 3'-6' RUSH WOF -YIro OR WSW GRAMS CROSS (3/9 POUND OR DAFINRWSAi CHOSE mE D ZINI HUNG A Y1',3WAR aw TO 1'E BEARING BARE At 2 1/Y O.C) w III�Y�Yl1�M�M�M�EL�11 Wnnnnnnm�unl 0E 1:n�oil Ci.CC�� Ill WE�M�Mlnr YM�YM�mm 1 �I1 Ymn nlsnmi� IDMMMYF YMMMMIL WELL SCREEN NO 93 SILTR TEELFOREEOSWLJ TAINLESS A 1/4- RATE, WELDED INCH PACK TO GRAY, WIIH (NUIL 5)- 8/6',6' THREADS) ROIT To FASTEN GMrt WAN METAL PUTS ro cov¢R OPENING (FASTEN WITH 3/6'v6' B IRF/DED BOLTS) D PLAN DISCOVERY FELLOWSHIP CHURCH A portion of the Northeast Quarter of Section 13, Township 6 North, Range 69 West of the 6th Principal Meridian, City of Fort Collins, County of Larimer, State of Colorado DRAINAGE & DETENTION DETAILS FORMED SUED SUUMR5 STEEL MCHCR BOLTS EN NTERMNMIF WELDS ON TOP AND SIDES WELL SCREEN SECTION A -A HOOP OR dWU4R 'an OLVLM (WO) Ricci Tiq SEE TABLE �1/4' OFF) THICK STEEL FIEW UNIFORM PEACE BMOY R'JME OF ]• (IW.) SINN.FA STEEL MILS TO BE AT ANCHOR BOUT TOP) INERT OF IUTE FLOW CONTROL PLATE fair D.c. 1 NY.011•L Herz' o.c. SECTION D-D - 14012 01 FIRE WELT SWEET INIt' GENERAL NOTES N93 (L.S. FILTER STAWIFSS STEEL DR EGL'AI) I. O]NAE2 ML ME OUSS B. WAY BE GSI-AL'PWS N RINI 'ROW CONTROL 2 MENISC nt WK 9W BL EPoxr CMFFO AMO 11EFRIMEDE AND MALL PLATE Ra A VIWM )' OIAIWR.E. 7E PC WITH USE IIXNL WING WADES 100 YEAR WRIEST 3 I E SIP+ 9W L BE 4YIRD With UDICAL WNMYxI LXUEU S 3'-6 3 oRlncL PurE N I z' P C� MO 4wI BE Ix AEOF. WTH MWO M 1" IFD A. ALL ROSE MKS SEA 6E MO LONG SINHES1 STILL. HARDWARE AND Y. A ''. RµIDFO MIN NOUN PoD LSOARE ON WLINNL KLESY PALLS $. TIMS1 PSIIIXWLS SMALLMEBRIEF! IIVNLLS4 SIO MUNUM. DR SILU, SRO AFTER GLAIdNG. D NO A11 OI PONDERPADO W6EL MTH CONCRETE F SECTION C-C SECTION B-B LEGEND sOcr MIE A -A IM=MS IL A RI -A PONI I x D SUlm R mEn) ABBREVIATIONS CUR. tlflRYCF TW. FPCIL Ow 0.4EIR % RINN a IAa%TE IPUUMC SEEK. fLLMMx NIP "ON 9 ME W. EOFRT 1V0 MIER MWON MAX. MIAMI Lv a" OF STMCNR MIN. MIYM W2 am OF STRUCTURE O.C. ON DOWER IF XWER FIN. A FROM NV. <S2TO2 BUD. a WIXA ¢ A82).BI M. C N1�.1R SPILL EIEV. A928.81 ZVi Vf Wv A'HY -0• WE DA. O.r We a WARS T 1 a COWYH 1 OUTLET CONTROL STRUCTURE DETAIL SCALE: NTS SLOPE VARIES L SLOPE VARIES H SECTION x'CONCRETE TRICKLE PAN SCALE: NTS l TOP SOIL S SURFACE VEGETATION L TYPE T.• FUPRAP (VR E OLSY NON -WOVEN OEOTEXTILE FILTER FABRIC REINFORCED CONCRETE SILL EMERGENCY SPILLWAY SILL,- ENLARGEMENT SCALE: NTS APPROVAL SIGNATURES SEE DETAIL ENLARGEMENT, CIWSTRUCTION BR 2)• THIS SHEET TOP OF SPILLWAY SIDE ALL CE BE IN ACCORDANCE WITH THE CITY OF FORT COLLINS $TORtp'WATER CPRERR MANUAL. CITY ACCEPTANCE SHALL NOT RELIEVETHE ELEV. 4921 E51(dl ENGINEER OF RESPONSIBILITY FOR ERRORS, COR IgJ508 DESIGN DEFICIENCIES. FOR WHICH THE CITY IS HELD HARMLESS. L, C ICITY OF FORT COLLINS, COLORADO j UTILITY PLAN APPROVAL 01 SIIR'THICK HOT -DIPPED GALVANIZED STEEL PLATE SECTION A•A I 12-316" DIA. 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SILL ELEVATION scALE:1•a'A• CHECkEO BY: Pa"aR FeatD,I URNSSGIE:1•da-0' I 100-YR ORIFICE DETAIL 100-YR STORM ATTENUATION ORIFICE PLATE EMERGENCY SPILLWAY SILL SEEMED BY: SCALE: NTS SCALE: NITS SCALE: NTS Tame EnBinee, CHECKED 4 x5 DISCOVERY FELLOWSHIP CHURCH A portion of the Northeast Quarter of Section 13, Township 6 North, Range 69 West of the 6th Principal Meridian, City of Fort Collins, County of Larimer, State of Colorado SITE GRADING & DRAINAGE IMPROVEMENTS EMERGENCY OVE LL AY W/CpKRETE SILL Z U 4 t PROPERLY SOUNOAAY� CREST LENGIH.17 z 380.z e$ N 881T 23" W 00' ` z O7 � —4929 ` �927 \ 49 jWzNo 4928 26� SANITARY SEWER MANHOLE n >QLL 4 4 \ RIMRIM d93002 OUO 5 4930 + 9 ® 9 EXISTfq AU8111MNPWEIREE 4930 4929 N = -.. .. 4928 ° 00 4927 oa �Q 4926 93Q STORMS m MANHOLE F m F 1 1 � I RIM.ce'IOAS .Q0G9 YY4piii -- / Lo z Z '1 2' Concrete Lo f P R.ADS E i T CP Pan V' UNKNOWN) (SOURCE UNKNOWN) C14 IJLJ Q0 Q CO N La O V C7 926 4�6 a U dd w CD I m Z 5 o :t .46:1 y `3 Ud� RIP RAP G mF4 4gV gg2g ,e•AGe pILYERr MURCE U ISGURCE uuNGwNt a �9 a A� DEC SEE PLANS SCALE: 1'=10'-0• iRTH 16NOV n NLKn.v ' 0 6 10' 20' 00' S