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HomeMy WebLinkAboutSite Certifications - 12/09/1999Four Seasons 1011 Arbor Avenue Fort Collins, Colorado 80525 December 1, 1999 Mr. Basil Harridan Stormwater/City of Fort Collins 700 Wood Street Fort Collins, CO 80521 RE: Four Seasons Condominiums Project Dear Basil, Phone:(970) 266-0708 Fax:(970) 266-0715 With this letter, Ranch Builders Corporation is submitting a partial site drainage certification survey for you review. The survey is submitted according to our last meeting in which we stated that only the first lift of asphalt will be installed, and that there are other items of work to finish before the certification process is complete. It was also discussed that if this initial survey meets with the departments approval, the remaining building permits will be released(#13426), but all site drainage items must be completed before certificates of occupancy(presumably later buildings) will be granted. The following is a list of items to be completed for site drainage: 1. Install concrete trickle pan at roadways. 2. Final asphalt surface. 3. Final grading a perimeter of detention area. 4. Erosion control fabric at detention overflows. All efforts will be made to complete the previous list as soon as possible, weather and ground temperatures permitting. Individual building grades and drainage will be certified as the buildings are completed. Merle Bush Project Superintendent Ranch Builders Corporation Attachments THE SEAR -BROWN GROUP FULL -SERVICE DESIGN PROFESSIONALS 209 SOUTH MELDRUM FORT COLLINS, COLORADO 80521-2603 970-482-5922 FAX:970-482-6368 December 1, 1999 Mr. Basil Harridan City of Fort Collins - Stormwater Utility 700 Wood Street Fort Collins, CO 80521 RE`. Drainage Certification Southeast Quadrant of the Intersection of Horsetooth Road and Shields Street Four Seasons Condominiums The Sear -Brown Group Project Number; 734-001 Dear Mr. Harridan, On November 22"d, 1999 a survey crew from The Sear -Brown Group visited the above referenced site and surveyed the pan grading and measured elevations as red lined on the enclosed photocopy of the site. Please note that field notes are not included as they were recorded on a similar photocopy. The measured site elevations are similar to the design elevations and meet the intent of the site grading design. This certification is signed and stamped and by signing this letter I attest that to the best of my knowledge the conditions of the site are as shown on the attached red lined photocopy. 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 the Building Permit or Certificates of Occupancy. Thank wii�f4r-your time and consideration of this submittal. 0 RE .E. ALE NEW YORK * PENNSYLVANIA COLORADO • UTAH • WYOMING STANDARDS IN EXCELLENCE EQUAL OPPORTUNITY EMPLOYER Four Seasons Condominiums North Detention Pond Rating Curve Elev Area Area Storage (ft) (ft2) (ac) (ac-ft) 5074 0 0.00 0.00 5075 5,300 0.12 0.04 5076 11,335 0.26 0.17 5077 13,940 0.32 0.29 5078 17,070 0.39 0.35 5079 19,890 0.46 0.76 734-002 Cumulat. Storage (ac-ft) 0.00 0.04 8 0.21 0.50 0.85 1.62 Storage from detention pond design for site only. See previous page for layout of pond. Interpolate the water surface elevation for the 100-year storage in detention pond: Enter Required Storage W.S. Elev. Per March 1999 Final Drainage Report (ac-ft) (ft) By The Sear Brown Group (Pond 379) Linear: 0.9 5078.00 Design 100-year WSEL = 5077.87 Design 100-year Top of Berm = 5078.00 *As -Surveyed Top Of Berm = 5078.36 *Lowest Surveyed Point on Berm other than emergency spillways Area -Capacity Curve 0.60 3 0.50 2 - � w d 0.40 a 0.30 r 1 rm 0.20 m � 1 U U 0.10 0.00 0 5068 5069 5070 5071 5072 5073 5074 5075 Stage (ft el) -m-Area -*-Capacity Four Seasons Condominiums South Detention Pond Rating Curve Elev Area Area Storage (ft) (ft2) (ac) (ac-ft) 5068 0 0.00 0.00 5069 2,150 0.05 0.02 5070 10,650 0.24 0.16 5071 15,275 0.35 0.29 5072 17,960 0.41 0.38 5073 20,120 0.46 0.43 5074 22,510 0.52 0.48 5075 23,000 0.53 0.52 VBL 1111111A Cumulat. Storage (ac-ft) 0.00 0.02 0.18 0.47 0.85 1.28 1.76 2.28 Storage from detention pond design for site only. See previous page for layout of pond. Interpolate the water surface elevation for the 100-year storage in detention pond: Enter Required Storage W.S. Elev. Per March 1999 Final Drainage Report (ac-ft) (ft) By The Sear -Brown Group (Pond 412) Linear: 2.1 5074.65 Design 100-year WSEL = 5074.37 Design 100-year Top of Berm = 5075.00 *As -Surveyed Top Of Berm = 5075.02 *Lowest Surveyed Point on Berm other than emergency spillways Area -Capacity Curve 0.60 3 0.50 2 .. R w 0.40 8 2 Q 0.30 w 1CL 0.20 � N 0.10 1 U 0.00 0 5068 5069 5070 5071 5072 5073 5074 5075 Stage (ft el) -■-Area Capacity August 11, 1999 Mr. Basil Hamdan Stormwater Utility City of Fort Collins 700 Wood Street Fort Collins, CO 80521 RE: Four Seasons Condominiums Four Seasons Phone: (970) 266-0708 1011 Arbor Avenue Fax: (970) 266-0715 Fort Collins, CO 80526 Dear Basil, Per our Phone conversation of this date, Ranch Builders Corporation will complete all improvements and site certification at one time, prior to any full building permits beyond Bldg. #10 being released. It is also agreed that Stormwater Utility will release Buildings #11— 16 for F & F permits at this time, but no building permits, beyond Bldg # 10, until site certification is complete. Sincerely, Merle L. Bush Project Superintendent Cc: Dennis Lane File Post -it* Fax Note 7671 oar L �► To From Co. Comept. Phone 8 Phone R i Fa: at /_ V Fe: � 1 11, 1999 Mr. Basil Hamden Stormwater Utility City of Fort Collins 700 Wood Street Fort Collins, CO 80521 RE: Four Seasons Condominiums Dear Basil, Fort Collins. 00 60526 Per our Phonc conversation of this date, Ranch Builders Corporation will complete all improvements and site certification at one time, prior to any fldl Building permits beyond Bldg 411110 being released. It is also agreed that Stormwater Utility will release Buildings #11— 16 for F & F permits at this limo, but no building permits, beyond Bldg # 10, until site ccttification is complete. Wile L. Bush Project Superintendent Cc: Dennis Lane File No Text ARCHITECTURE 2095outh Meldrum ENGINEERING Fort Collins,C080521 A SE Z R OW N PLANNING 970.482.5922 phone ff��CONSTRUCTION 970.482.6368 fax www.searbrown.com June 6, 2002 Mr. Jay Barber City of Fort Collins Utilities - Stormwater P.O. Box 580 Fort Collins, CO 80522 RE: Final Re -certification for Pond 412, Four Seasons Condominiums. Dear Mr. Barber, This certification letter is to serve as final certification for Pond 412 in the Four Seasons Condominiums project. An earlier certification, dated March 6, 2002, was sent to you to re -certify the pond volume following significant changes to the pond grading. In that certification, the overflow spillway had not yet been modified, and therefore, a complete certification was not granted. The weir improvements proposed with the March 6 letter have now been completed and the weir elevation has been raised by approximately 81 inches. A copy -of the previous certification letter with supporting documentation has been included with this certification for your convenience. Additionally, it should be'noted that the City has previously expressed concern regarding frequent nuisance flows from the Pond outlet pipe between storm events. This may have been due to a combination of excessive irrigation of the landscaping, and a gap between the orifice plate and the outlet headwall. On December 3.2001, standing water at the outlet and flow into the adjacent street was observed. The ground in and around the pond (including the top of berm) was saturated (there had been recent snow that was now melted). In'the following week, the gap between the orifice plate and the headwall was eliminated. In subsequent site visits, one in mid -December, one in mid -January and three in May, 2002, no standing water was observed in the bottom of the pond, nor was any water flowing out of the pond and into the adjacent street. A conversation with City Stormwater indicated that no citizen complaints regarding nuisance flows from this pond had been received during the winter'and spring of 2002. This certification is signed and stamped and by signing.this:letter I attest that, to the best of my knowledge, the as -built conditions of the site are as shown on the. attached drawing (copies of previously submitted documentation). Based on general agreement between the design intent and the current site conditions, we recommend release of held escrows, certificates and/or permits. Thank you for your time and consideration.of this submittal. Respectfully, pDo Debbie Hafe 3$22 O.e, & 02 Cc Ranch Co • •»...•' File 940-002A OVAL 3 SEAR• BROWN March 6, 2002 Mr. Jay Barber City of Fort Collins Utilities - Stormwater P.O. Box 580 Fort Collins, CO 80522 ARCHITECTURE ENGINEERING PLANNING CONSTRUCTION RE: Pond Volume Re -certification for Pond 412, Four Seasons Condominiums Dear Mr. Barber, 209 South Meldmm Fort Collins,CO 80521 970.4825922 phone 970.482.6368 fax wwwsearbrown.com On January 17, 2002, a Sear -Brown survey crew visited the above -referenced site, surveyed the pond grading and measured elevations as shown on the enclosed drawing. The pond volume re- certification is required because the bottom elevation of the pond has been modified. The measured pond volume is sufficient to meet the required volume of 2.1 acre-feet, although freeboard has been reduced to approximately 0.75 feet and the volume requirement is met at an elevation that is above the existing spillway elevation. Therefore, the overflow spillway must be modified as shown on the attached detail in order for the certification requirements to be met. (Recent conversation with Dan Garcia of Ranch Communities indicate that this work is imminent.) The reduced freeboard is present only on the east and south sides of the pond and as these sides face Wabash and Century Drive, freeboard breaches would spill to these streets. The west -side berm provides sufficient freeboard as does the north side. The curb cut located at the north-east comer of the pond is at an elevation just below the 100-year ponding elevation and the pond will encroach slightly into the parking area during the 100-year storm event. This encroachment is not expected to be significant or to impact any of the adjacent structures as the curb cut elevation is 74.86 and the 100-year ponding elevation is 75.0. This. certification is signed and stamped and by signing this letter I attest that, to the best of my knowledge, the as -built conditions of the site are as shown on the attached drawing. Thank you for your time and consideration of this submittal. Yours Sincerely, Debbie Haferman, P.E. Cc: Ranch Communities File 940-002A 0 Ln \> f� V W t6l W Tic m v J j (A ow C W � W " Zo q cn N o D in a - a Q zaM !A r, m m O r` N N U. J z O 4) J W a CV W F7 -j (n O ou Y rZjZ } �h S zIAJJJ W Ov , OD w in cn[� Z cr o < 2W uof Ix Vo�4 % N;n CL Y >- O L u J O L �i l wt-<a .r<�n.� .�' oaz = f LZ 40 r. Z W M u j �p�� KJ1 k'WFI Z uvi � z�i�s0u 0. �- > �> 3 p wQ >. I' v� W J W m a y, ow pn \ J _ �� • li Z Wcc O s v N Q. acczaM co m m N w W a > Z DLi 09 O u W Z Y ZO O Z } N zj�W W 5O W V)V) �C LLJI O Z Z a: 8 W1.4 U 2 Q �wLa o� O r m� OIx � Via~ cn ; a �J W=z Y}1W> cr Ozw rl _W rf �rl U iO W Lr to z z I o 0 a W O WJ 0 W co L The Sear -Brown Group Four Seasons - AS-BUILTS 940-002 Detention Pond 412 Area -Capacity Rating Curve . Cumulative Elev Area Area Storage (ft) (ft2) (ac) (ac-ft) ------- --------- ---------------------------------- ----------------- V = d/3`(A+(AB)A.5+B) 69.7 0 0.00 0 0 70.0 9,154 0.21 0.02 915 71.0 14,623. 0.34 0.29 12,698 72.0 17,175 0.39 0.66 28,580 73.0 19,383 0.44 1.08 46,847 74.0 21,794 0.50 1.55 67,424 75.0 24,246 0.56 2.08 90,433 /60- '� s o 0.6 0.5 U f4 ca 0.4 N Q 0.3 U 0.2 (f) 0.1 0 r-------------------------- -- ....i42 ----- " '---------- -------------I - - - - - m ----------' ----------------------f--c-------------- 69 70 71 72 73 74 75 Stage (ft elevation) � Area -•- Capacity 24-Jan-2002 THE SEAR -BROWN GROUP WEIR SECTION FLOW DATA Revised Pond 412 Spillway WEIR COEF. 3.000 STA ELEV 0.0 75.90 3.0 75.00 30.0 75.00 33.0 75.90 ELEVATION DISCHARGE (feet) . (cfs) ------------------ 75.00 0.0 75.10 2.6 75.20 7.4 75.30 13.7 75.40 21.2 75.50 29.9 75.60 39.6 75.70 50.3 75.80 62.0 75.90 ff�SEAR-BROW�N Letter Of Transmittal 209 SOUTH MELDRUM FORT COLLINS, COLORADO 80521 (970)482-5922 Fax: (970) 482-6368 TO Jay Barber City of Fort Collins 700 Wood Street Fort Collins, CO 80521 ATTN WE ARE SENDING YOU ❑ Prints ❑ Copy of Letter ® Attached ❑ Reproducibles ❑ Change Order DATE 03/06/02 PROJ.NO. 940-002 RE Four Seasons Pond 412 ❑ Under Separate Cover ❑ Specifications ❑ Transmitted Via ❑ Shop Drawings 1 I I I Drainase Certification letter and documentation TRANSMITTED ❑ For Approval ❑ As Requested ® For Your Use ❑ For Review and Comment COMMENTS COPY TO with (❑) Enc. with (❑) Enc. SIGNED Debbie Haf9rman, P.E. #SB-01 (01/01) N__S E �AR• BROWN ARCHITECTURE 209 South Meldrum ENGINEERING Fort Collins, CO 80521 PLANNING 970.482.5922 phone CONSTRUCTION 970A82.6368 fax www.searbrownxom March 6, 2002 Mr. Jay Barber City of Fort Collins Utilities - Stormwater P.O. Box 580 Fort Collins, CO 80522 RE: Pond Volume Re -certification for Pond 412, Four Seasons Condominiums Dear Mr. Barber, On January 17, 2002, a Sear -Brown survey crew visited the above -referenced site, surveyed the pond grading and measured elevations as shown on the enclosed drawing. The pond volume re- certification is required because the bottom elevation of the pond has been modified. The measured pond volume is sufficient to meet the required volume of 2.1 acre-feet, although freeboard has been reduced to approximately 0.75 feet and the volume requirement is met at an elevation that is above the existing spillway elevation. Therefore, the overflow spillway must be modified as shown on the attached detail in order for the certification requirements to be met. (Recent conversation with Dan Garcia of Ranch Communities indicate that this work is imminent.) The reduced freeboard is present only on the east and south sides of the pond and as these sides face Wabash and Century Drive, freeboard breaches would spill to these streets. The west -side berm provides sufficient freeboard as does the north side. The curb cut located at the north-east corner of the pond is at an elevation just below the 100-year ponding elevation and the pond will encroach slightly into the parking area during the 100-year storm event. This encroachment is not expected to be significant or to impact any of the adjacent structures as the curb cut elevation is 74.86 and the 100-year ponding elevation is 75.0. This certification is signed and stamped and by signing this letter I attest that, to the best of my knowledge, the as -built conditions of the site are as shown on the attached drawing. Thank you for your time and consideration of this submittal. Yours Sincerely, Debbie Hafe an Cc: Ranch Communities File 940-002A The Sear -Brown Group Four Seasons - AS-BUILTS 940-002 Detention Pond 412 Area -Capacity Rating Curve Cumulative Elev Area Area Storage (ft) (ft2) (ac) (ac-ft) ---------------=----------------------------------- ----------------- V = d/3*(A+(AB)A.5+B) 69.7 0 0.00 0 0 70.0 9,154 0.21 0.02 915 71.0 14,623 0.34 0.29 12,698 72.0 17,175 0.39 0.66 28,580 73.0 19,383 0.44 1.08 46,847 74.0 21,794 0.50 1.55 67,424 75.0 24,246 0.56 2.08 90,433 /60- 0.6 2.5 ,0.5 ----- ------------------------- / 2 co 04 ------------------ ------------- ---- U N 1.5 :4 Q0.3 ----------------------- w U / / 1 co d 92 0.2 ------------------ l ---------------- @ a � � U U) 0.1 ---- -------- ------------------ 0.5 e 0 0 69 70 71 72 73 74 75 Stage (ft elevation) Area o- Capacity 24-Jan-2002 c (n cr r, Q m Q m ►� to t 4 1 L� N W • i� .£ Qzw � a ZdMU. LA W p N LLJ ZZ V U�1W' Z �c ih ?�WW W N (n �O ��Uw ffi zz 5$ M soN j�fLa Olal- d i N ;c 0. r UZJ Y~} w U W J ce < —i �! o � o= L i Z U AJ to w W o`'iai z z�z 'Ou z�c�� �. Zz� �Fzw I� WT F - W F . z �t G Z�zTC)0 a w O WJ W mL THE SEAR -BROWN GROUP WEIR SECTION FLOW DATA Revised Pond 412 Spillway WEIR COEF. 3.000 STA ELEV 0.0 75.90 3.0 75.00 30.0 75.00 33.0 75.90 ELEVATION DISCHARGE (feet) (cfs) 75.00 0.0 75.10 2.6 75.20 7.4 75.30 13.7 75.40 21.2 75.50 29.9 75.60 39.6 75.70 50.3 75.80 62.0,a�' 75.90 74.6 ��,� S• 8� o. �� nd b� FOUR SEASONS POND LX L\SURVEY\SDSKPROJ\940-002 PONDVOL.DWG SCALE 11-20' JANUARY 17, 2002 ASSUMED HORIZONTAL DATUM CITY OF FORT COLLINS VERTICAL DATUM CONCRETE PAN BM 5-93 AND BM 17-97 FB 376 PG'S 56-57 36" CURB CUT AT FL C&G ,1 t ` '� �-2-24" RCP WITH FES RIPRAP 18" RCP WITH FES l it I; ; l;1 fill 2"PVC f ' if i i f0� 116 _ PVC DRAIN 4X24X HDPE224"AREA INLET INVERT OUT =TOG-3.64' CONTOUR SO FT CL CURB —CUT AT FL 5070 9153.68 o �Faa 107 / 5071 14,623.41 c /5072 17,174.86 12" WEIR"' 5073 19,383.01 5074 21,794.46 MISC. OUTLET —BLOCKED 5075 24,246.43 Eo�SEAR•SROWN 209 &uM M wm Ft. Cdlins, CO. IM21-M3 (970)<92-5 www.aeaidmvn.mn MATCHLINE W/ SHEET g4 7] o� III 70 TYPE II FF=83.70 ilim p�■ w Z J n = a F- N Q � 3 MATCHLINE W/ SHEET /4 T 7FF=80j.75,p Il LJ Z J to IE I— Z Q N I SCALE 1'=00' g � Ygpt V LEaeo�, a�8'C4C6@ O EXISTING SANITARY SEWER MANHOLE utl !a3 S$4 IX EXISTING FIRE HYDRANT F w EXISTING WATER VALVE EICSTING WATERLINE D 88w Will —uw— EXISTING SANITARY SEWER LINE k — — — — EASTINC CMTOUR vas >� PROPOSED CONTOUR HIGH POINT AND ROW DIRECTION o PROPOSED STORM DRAIN PIPE yy Irk [ _jaa 3� • PROPOSED INLET 9 fir tl� S f INFLOW CURB AND CUTTER E [[[ G .ra SPOT ELEVATION �! SPOT "VATCN EIOSTNG E PROPOSED CONCRETE PAN OR PROPOSED SIDEWALK CHASE OB PIPE �.{ PROPOSED SIDEWALK STEPS ® PROPOSED ROCK LINED WALE CALL UTILITY NOTIFICATION CENTER OF COLORADO 1-800-922-1987 GR 534-6700 W WFCWE WMGMGEORQa FOR of City of Port Collins, Colorado U47LLTY PLAN APPROVAL APPROVED: Dirim r at zRownial Bale CHECKED BY: 1fa1w R wvx R WRIT DW CHECKED BY: Blemnla CUBIT D&UP CHECKED BY: Pub ! b Uan 0.b CHECKED BY: aV CHECKED BY: MM S O i w owa a O mom 0 i 0 Q wZon wi<02 U a OIOi00 bz LL w LL O IL FRaF[T xu 734-001 mmG "I 5 — 21 E.EN{ styliCE JY.r% 3.xy B bI,7 ` JAWJ Y92 Y9/ 1 , ARBOR,* 1 I � m n ps A4 n T 0 fn µ: cr 0 ,ssl:a es� i?A MIN �.ts i�FWrAl Milo -�S1111111I III 1 TYAE III �. � IFFIIII , I�. moor M .Y ` ►_ of �ITYPE f _ It TYPE III TYPE It r� TJ�am TYPE 11111-01 i..v I �►�_... ._ �.. 1 TYPE 4 MATCHUNE N B SCALE 1'=30' O EAsnNO SANITARY gKA uA1pgE .+m SPOT E Anpl vc EASING @ NYORANT J® SPOT ELEVATION EASING C EUSTNG WRIER III R10PO4D ISMRIE DAN [rv— EXISrNG WATERLINE 111111 11 SIDI OIAS M PNF CALL —NIL— E%ISTrvG SANITARY SEWER lME y PRCPO�SD 9[EWA,I, STEPS TIER OF MOFIAIION GENT£R OF COLOHADO Fi 1-800-922-1987 ---- E)I CCNTWR ® PRCPo4D RIXY( LIIFD SYN£ PRGPOSEG GWiWR CA 534-6700 = ---Fs NIGN POINT AND FLOW Pi1EC11WIN BEFORE W Dol GRAPE ON m AYATE PROPOSED STONY GRAIN AK FORI � j IN1Ea � PROOOSED MLEi ARM WAS AND WTTER City of Fort Collira Colorado UTRITY PLAN APPROVAL APPROII{p: oaeeler al Balveeio[ Cme CHECNEO BY: Tetm a •ementr guar Osle CNECNED BY: slwm.ew gua4 URIe CNECNED BY: emb t m.sgm we CNECNEO BY: Dale CNECKEO BY: oafs z o_ w N Cu— < < J o < MOM � O A CILL G O LL 2 LL 0 LL Y4 for PROEM No. 734-001 DRAWING NO. 4 - 21 SCALE r=30- Q FLTEC SW 1YFA M.1NItlE w. P151M f1E Nl➢RNI! W EASING am V&W —w— EASING MAIWIi —YM— EASING SAMTMY S.YEp ME EA"NG CMIgM PROPOSED DON U —7 NIGH PONT AND ROW MRECTOH PROPOSED S10#iM Dam PIPE pw0 .Ma SPOT BEVAIIW ,DMM SPOT E1EVAIM EASING E PROPOSED COIOETE PIN 11111 PROPOSED SAEIGJ CHASE ON PIK m PROPOSED 91"M SEEPS CALL tRRfTY NOTFICARON CENTER OF COEORADO 1-800-922-1987 At 534-6700 M ewe. U„eM"ORIII id TE WOMAN aYDeYWM City of Port Collins, Colorado UTMM PLAN APPROVAL APPROVED: DMMMer m Aerie{ DW CHECKED BY: Taw a Tu ur Duuy Date CHEp(ED BY: 8lormnte utay Uste CHECKED BY: t>on. a a.Me.um DAU CHECKED BY: Date CHECKED BY: D=te r, 6j 0 a 0 o U i a ZW f N Nwz 2 G O O mzon U a Ca f6 SFF C yoLL0O S o¢ LL UL K PROXCT No 734-001 OUMNG NJ 6 - 21