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Home My WebLink AboutSite Certifications - 02/01/2002TST, INC. Consulting Engineers iii 748 Whalers Way• Bu ilding D • Fort Collins, CO 80525 (970) 226-0557 • Fax (970) 226-02 04 To: Jay Barber City of Fort Collins Stormwater Dept. STORMWATER RECEIVF!D FEBO 1 ZOO~ct No : Project: Date: TRANSMITTAL 0956-000 Linden Park 2/1 /02 Re : Storm Certification We transmit G] Herewith D Under Separate Cover Dv 1A D Shop Drawings [TI Copy of Letter D Specifications D Change Order D Other [lJ Prints D Survey D Field Order DESCRIPTION Storm Certification Letter 5, 6, 19-24 Remarks Let me know if ou have an uestions. IF ENCLOSURES RECEIVED ARE NOT AS LISTED ABOVE, KINDLY NOTIFY AT ONCE Copies To: Brad Lenz -Centex Homes By: Kevin Ash , PE TST, Inc. Consulting Engineers Mr. Jay Barber City Of Fort Collins Stormwater Utility Department P.O. Box580 Fort Collins, Co 80522-0580 Re: Linden Park Phase 1 and 2 Stormwater Certification Project No. 0956-000 Dear Mr. Barber: February 1, 2002 Please find enclosed a partial Stormwater Drainage Certification for Phases 1 and 2 of the Linden Park Subdivision for the as-built condition as of January 25, 2002. TST, Inc. surveyed the above drainage facilities on October 24, 2001, January 7, 2002 and January 25, 2002, as the contractor installed them . Included are redlined prints of the storm sewer system showing the as-built condition. Per our conversation on January 30, 2002 , we are submitting a partial certification . The following items have not been installed per the approved plans: 1. The storm pipe from the outlet structure of Detention Pond A to Storm Manhole #7 slopes opposite the direction of the approved plans and causes runoff to pond 0.06' before spilling into the rest of Storm Line ST-1. 2. Storm Manhole #7 does not reach the required elevation at the rim. The specified grate was not installed per the approved plans and does not create the emergency overflow protection that the City wanted. TST has made Centex Homes and the City of Fort Collins Stormwater Department aware of the problem. Centex Homes has agreed, verbally, to have this situation corrected by the end of February. It is my direction from Centex Homes to submit this partial certification, and then update it once the aforementioned items have been addressed . The outlet structure, Storm Manhole #7 and all associated structures within Detention Pond A will be subject to re certification. Please contact me at 226-0557 should you have any questions or require further information. Sincerely, TST, INC . CONSUL TING ENGINEERS ~L-Kevin Ash, P.E. cc: Brad Lenz, Centex Homes Enclosures TST, INC . Consult i ng Eng i neers 748 Wha lers Way • Bui lding D Fort CoUins, CO 80525 (970) 226-055 7 Metro (303) 595-9103 Fax (970) 226-0204 Email info@tstinc.com www.tstinc.com Consulting Engineers STORM WATER RECE IVE ~ANSMITT AL S TST, INC. 7 48 Whalers Way • Building D • Fort Collins , CO 80525 (970 ) 226-0557 • Fax (970) 226-0204 APR0 4 2 To: Jay Barber ~@~---=~~5~6-~0~00c;._ _____ _ City of Fort Collins Project : Linden Park Stormwater Date : 4/ 4/02 Re: Storm Drainage Cert . We transmit D Herewith D Under Separate Cover Dv1A D Shop Drawings W Copy of Letter 0. COPIES 1 1 Remarks D Specifications D Change Order D Other W Prints D Survey D Field Order nDAWINGS NO. DESCRIPTION 24 of 50 Updated Storm Cert Print 1 Storm Certification Addendum Letter IF ENCLOSURES RECEIVED ARE NOT AS LISTED ABOVE , KINDLY NOTIFY AT ONCE Copies To: By: Kevin Ash , PE TST, Inc. Consulting Engineers Mr. Jay Barber City Of Fort Collins Stormwater Utility Department P.O. Box580 Fort Collins, Co 80522-0580 Re: Linden Park Phase 1 and 2 Stormwater Certification Project No. 0956-000 Dear Mr. Barber: March 20, 2002 This is to update the partial Stormwater Drainage Certification for Phases 1 and 2 of the Linden Park Subdivision dated February 1, 2002 . TST, Inc. surveyed the following drainage facilities on March 4, 2002 . Included are redlined prints of the storm sewer system showing the updated as built condition. The following items have now been installed per the approved plans: 1. The storm pipe from the outlet structure of Detention Pond A to Storm Manhole #7 now slopes correctly per the direction of the approved plans. 2 . Storm Manhole #7 has a rim elevation of 4935.31. The specified grate is now installed per the approved plans and will create the emergency overflow protection that the City wanted. This certification does not include the irrigation conveyance through the site . A new design for the irrigation siphon on the west side of the site, and the irrigation tie-in to the east has been completed. Please contact me at 226-0557 should you have any questions or require further information. Sincerely, TST, INC. CONSUL TING ENGINEERS ~.J- KAS/cms cc: Brad Lenz, Centex Homes Enclosures TST, INC. Consulting Engin eer s 748 Whalers Way -Building D Fort Collins, CO 80525 (970) 226-0557 Metro (303) 595-9103 Fax (970) 226-0204 Email info @tstinc.com www.tstinc.com l ·1Ht>til /A RK 1J.R-r/A .L CE-t..T ,pc.ATlut-l z/1/n- DRAINAGE CERTIFICATION FORM Please fill out all applicable items in this certification form for single family, mul.ti•-f amily 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 b. cross-sections and spot elevations -positive fall to pan -side slopes -invert elevation ·-spiilway elevation -placement and size of riprap -side slopes -grading -orifice plate installation and size -compaction of berm -structural integrity of pond 2. Swales -location (are they within easement) -dimensions and cross-section verification -longitudinal sl _opes and side slopes ,-spot elevations _L _x_ l p o11 I> B X Co"tr,-c-r"P~ -permanent erosion control measures ( drop structures, riprap, etc ... · . ) -tie-in to pipes , pans, curbs, etc.~ .. -weir size (elevations, size, opening, etc ... ) -available freeboard -landscaping infringement on swales 3. Pipes 4. -size and type -slopes (as-built and comparison to minimum 0.4% slope) -pipe capacity calculations if slopes are significantly altered -invert elevations -installa·d.on and backfill material -cover -encasement and clearance -from other util~ty lines close by -joints Concrete Pan Channels -size -slope . -super elevation -cross-section -thickness -elevations __x_ 1- _L ~P5Wfll, /Jti.T I t1 $1A'.,l _x_ _x_ ...ti6... ~ i _:/4_ 5. Inlets -size and type -size of op e ning (or name of standard used) ~grate elev at ion -invert elevation -box size 6. Cross pans -size -type -grade -elevation -cross-sectional depth -tie-in to curb and gutter 7. Culverts -size :..type -invert elevation -headwalls 8 • Under drains · -size -type -cov er -backfill -ge o textiles X L JL L L ~tl[llACJo/( ~Cf7.(l. ~l~,e_ ~C.'(M Cotl[t:A-C1t//l .. -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 Measures: -Permanent ve~etation (6" bare spots and weeds under control) -riprap -riprap bedding -drop sections -sediment basins/water quality ponds -netting mats/blankets -mulching ·~c.TtL ktt.AC-rct.. l>/ii/(AC:r6t.. ~M ,~e C-orrr /lit r:r ~ ~Ute~ w 17tAtr6t<. . - . . , · • 2. Temporary Measures: -mulching -inlet filter installation .-check bale dams -seeding _and temporary vegetation -silt fence D. Site Cleanup After Construction -construction clean u~ -smoothing of ruts -reseeding E. Statement of Compliance CotvrlfA c.114( ~AA C..i?>~ ~rJTAA C..~/.t ~t.TCP.. ~~I/t o \,J~,-1 ~\VA t.y' ~ '-'-""1l.1v-r \JP . . ~ V ;Da . i,.;frtW r:r1ot11 ~ t/t1°06' ~,'l/1'il,Vt'{t ~/J 5f/lL V~Obt. l,~1J,1j~/ This certification ·is signed ·and stamped and by signing this form the engineer (s) attest.s that to the best of his knowledge the as-built conditions of the dr.ainage 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 .certificati~n and prevent the release of any Stormwater Utility holds on Building Permits and/or Certificates of Occupancy . F . Signature and Stamp by a Colorad6,-~~~~ rofessional Engineer. ~im~.;00 ~~ ., ~® ,-~i : • ""o U1 i-r ·····o<,c~/ ONAI f..\~_:,,,,;,-