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Home My WebLink AboutSite Certifications - 11/19/2004NENORTHERN ENGINEERING SERVICES, INC. November 19, 2004 Jay Barber City of Fort Collins Stormwater Utility Department 700 Wood St. Ft.Collins, CO 80521 RE: Fossil Lake PUD Second Filing-- Phase 3 and 4 Drainage Certification Dear Jay: STORMWATER RECEIVED NOV 19 2004 We have completed our review of the as -constructed major drainage improvements for the above referenced project as it relates to the approved final construction plan design. This certification is intended to verify compliance of the constructed major drainage improvements for the approved construction plans entitled "Fossil Lake PUD Second Filing". Field surveys of the site were conducted by King Surveyors in October and November of 2004 and have been used to verify general conformance to the Plans. The project engineer conducted a site visit on November 5, 2004 to verify grading and major drainage improvements. Based on the survey data provided by King Surveyors and personal site inspection, we believe that all major drainage improvements have been constructed in general compliance with the design with exception to the 10-foot sidewalk culvert on Long Creek Drive and the 5-foot sidewalk chase just north of Lots 6 and 7 of Block 9. These items have not yet been completed because sidewalks have not yet been laid. The sidewalks will be completed in the near future and the sidewalk chase and culvert will be finished with this construction. We will certify the 10-foot sidewalk culvert and 5-foot sidewalk chase upon their completion. The volume for Water Quality Pond I was calculated from the topography provided by King Surveyors. The design volume for Pond 1 was 0.49 acre-feet. The as -built pond achieves the required 0.49 acre-feet of storage at water surface elevation 4891.32. With the top of the pond at elevation 4893.0, there is 1.7-feet of freeboard. Thus, we conclude that Water Quality Pond I will perform adequately with the design intent. There are minor inconsistencies throughout the site; however, the performance of the drainage design, in my opinion, will not be hindered. To the best of my knowledge the major drainage improvements, apart from the sidewalk chase and sidewalk culvert listed above, for Fossil Lake PUD Second Filing - Phase 3 and 4 are constructed in substantial compliance with the design intent of the approved construction drawings. If you require additional information or analysis regarding this project please contact me at 221-4158 ext.106. NNORTSincerely, HERN ENGINEERING SERVICES, INC. C:3(6271 Aaron Cvar, P.E.Senior Engineer cc: Aaron Everitt, Everitt Enterprises 420 SOUTH HOWES, SUITE 202 / FORT COLLINS, COLORADO 80521 / 970.221.4158 / FAX 970.221.4159 N~ NORTHERN ENGINEERING NESERVICES, INC. November 29, 2004 Jay Barber Fort Collins Stormwater Utility 700 Wood St. Ft.Collins, CO 80522 RE: Fossil Lake PUD Second Filing - Phase 3 and 4 Drainage Certification — Punch List of Items To Be Completed Dear Jay: The following is a list of items that have not yet been completed for Fossil Lake PUD Second Filing - Phase 3 and 4: • The 10-foot sidewalk culvert on the north side of Long Creek Drive labeled "Inlet 10" on the plans • The 5-foot sidewalk chase just north of "Inlet 10" We will certify these items as soon as they are constructed (anticipated within the next 2 weeks). Sincerely, NORTHERN ENGINEERING SERVICES, INC. Aaron Cvar, P.E. Senior Engineer 420 SOUTH HOWES, SUITE 202, FORT COLLINS, COLORADO 80521, (970) 221-4158, FAX (970 )221-4159 hB-12-2M THU U8:3l AM FT COLLINS UTILITIES FAX NO, 9702216593 P. 03 ,a DRAINAGE CERTIFICATION FORM Please fill out all applicable items in this certification form for single family, multi' -family and commercial properties. Write "OK" for items checked or actual number checked in field. Use "N/A" for items that are not applicable to the property that is being certified. A. Drainage facilities certification .1. Pond Certification -volume verification a. topographic records and volume nK b. cross -sections and spot elevations -positive fall to pan -side slopes o� -invert elevation o k -spillway elevation -placement and size of riprap -side slopes -grading ®� -orifice plate installation and size -compaction of berm r -structural integrity of pond 2. swales -location (are they within easement) O -dimensions and cross-section verification e7 -longitudinal slopes and side slopes -spot elevations rrd-12-2M FHU U8;J7 AM FT CULLINS UTILITIES FAX NO. 9702216593 P. 04 -permanent erosion control measures (drop structures, riprap, etc....) .-tie-in to pipes; pans, curbs, etc.... ®� -weir size (elevations, size, opening, etc...) h�/+t -available freeboard O{r! -landscaping infringement on swales �RC 3. ,Pipes -size and type -slopes (as -built and comparison to minimum 0.4% slope) DY -pipe capacity calculations if slopes are significantly altered -invert elevations G �' -installation and backfill material -cover b- -encasement and clearance from other utility lines close by N /�, -joints -T 4. Concrete _Pan Channels -size o� -slope -super elevation ►J -cross-section -thickness tJ -elevations Z - _ rtd-1 zUU4 IHU Ud:�I AM hT UULLINS UTILITIES FAX N0, 9702216593 c _ s. inlets size and type f3K -size of opening (or name of standard used) -grate elevation p1G -invert elevation -box size -- 6. Cross___Pa -size -type fL -grade -elevation tea" -cross-sectional depth -tie-in to curb and gutter O 7. Culverts -size /� O -type 4 -invert elevation C' -headwalls 8., Underdrai s -size -type -cover -backfill -geotextiles 17 3 htb-I&LUU4 IHU Ud:�/ AM h'I' COLLINS UTILITIES FAX N0, 9702216593 P, 06 j -cleanouts 9. Curb cuts -size -tie in to Swale, pipe, etc.... B. Certification of Grade Elevations Adjacent to Drainage Facilities: -minimum opening elevations -top of foundation elevations. -comparison to 100 year WSEL"s (Freeboard requirements and floodplain issues) c. certification of Erosion Control Measures: 1. Permanent Measurers -Permanent vegetation (6" bare spots and weeds / under control) � /, -riprap O A -riprap bedding L�-� -drop sections -sediment basins/water quality pondsD k- -netting mats/blankets -mulching y ftd _I&ZUU4 IN Ua:J/ AM H* COLLINS UTILITIES FAX NO. 9702216593 p, 07 2. Temporary Measures: -mulching -inlet filter installation -check bale dams -seeding and temporary vegetation .-silt fence D. Site Cleanup After Construction -construction clean up -smoothing of ruts -reseeding E. Statement of Compliance D'k!- K/A This certification is signed And stamped and by signing this form the engineer(s) attests that to the best of his knowledge the as -built conditions of the drainage facilities are as, described in the above form and in the redlined plans enclosed. Failure to properly disclose all known information could result in the rejection of this certification and prevent the release of any Stormwater Utility holds on Building Permits and/or Certificates of Occupancy. F. Signature and Stamp by a Colorado Registered Professional Engineer.