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HomeMy WebLinkAboutGrading Plans - 09/24/2001f LETTER OF TRANSMITTAL TO: City of Fort Collins Stormwater Utility P.O. Box 580 Ft. Collins, Colorado 80522-0580 ATTN: Jay Barber Date: 09/24/2001 Project No. 1788-09-01 Re: Lot 20, Block 16, Craft Resubdivision 338 East Pitkin Street Unit B; Ft. Collins, Colorado WE ARE SENDING YOU: ❑ Shop Drawings ❑ Prints ❑ Copy of Letter ❑ Change order 0 Plans ❑ Samples ❑ Other AutoCAD drawing Files CA/V � � SHEAR ENGINEERING CORPORATION ❑ Specifications COPIES DATE NO. DESCRIPTION 3 - - Copies of Final Grading Plan THESE ARE TRANSMITTED as checked below: ❑ For Approval ❑ Approved as Submitted 0 For your use ❑ Approved as Noted ❑ As Requested ❑ Returned for Corrections ❑ For Review and Comment ❑ For Bids Due 2001 ❑ REMARKS: Jay, ❑ Resubmit _ Copies for Approval ❑ Submit _Copies for Distribution ❑ Return Corrected Prints As we have discussed in the past, we are submitting our individual lot grading plan for Lot 20, Block 16, Craft Resubdivision. The site is located at the northwest corner of the intersection of Pitkin and Peterson. This is an older lot in the Old Town area east of the University. To our knowledge, there is no approved subdivision grading plan. We exypyt to be providing a grading certification for this lot according to the requirements of the St ater Building Permit Notice for this site dated 07/19/2001. If you have comments or quest ns all us at 226-5,�, 34. SIGNED Brian W. Sheaf, P.E. cc: Eric Dengler; Associates in Building and Design 4836 S. College, Suite 12 Ft. Collins, CO 80525 (970) 226-5334 Fax (970) 282-0311 www.shearengineering.com August 30, 2001 Project No: 17U-0"I r � /t s1 9z���� Glen ScWeutw City of Ft Coffins Stormwater Utility P.O. Box 590 Ft. Collins, Colorado 90524 Re: Lot 20, Block 16, Craft Re -Subdivision; Ft. Coffins, Colorado 338 Eat ftbm Street Dear Glee, This letter serves as the Final Drainage report for the proposed single-family residence to be constructed at 338 East Pitkin Street on Lot 20, Block 16, Craft Re -Subdivision. There is an existing residence on a portion of the lot. The existing structure and drive are defined on the Improvement Location Certificate which was prepared by RJL Surveys. The Improvement Location Certificate is attached for immediate reference. The proposed improvements are represented on the "Site Plan" (attached) prepared by Associates in Building & Design LTD. The lot is 50' x 140' (7,000 SF). Lot 20, Block 16, Craft Re -Subdivision is located at the northwest coiner of the intersection of East Pitkin Street and Peterson Street. The site is situated within the Spring Creek Drainage Basin as designated on the City of Fort Collins Stormwater Basin Map. According to the Sprint Creek Master Drainageway Plan, lots within the basin must conform to specific requirements regarding areas that are impervious. The Spring Creek Basin is divided in many smaller areas designated sub -areas. Lot 20, Block 16, Craft Re -Subdivision is located within sub -area 230 which has an overall area of 11020 acres according to the Stormwater Management Model (SWMM) exhibit which supplements the Spring Creek Master Drainageway Plan. A copy of a portion of the exhibit is attached for immediate reference. Lot 20, Block 16, Craft Re -Subdivision is 0.16 acres in size and consists of approximately 0 15% of the entire alb -area 230. The maximum allowed impervious area within sub -area 230 is 51.0°/c. Refer to attached data sheets 1, 2 of 54 for immediate reference. The total impervious area has been calculated for Lot 20, Block 16, Craft Re -Subdivision The impervious area analysis includes the adjacent street pavement area to the centerline of East Pitkin Street and to the centerline of Peterson Street. All calculations are based on the ultimate expected improvements according to the attached exhibit, which was prepared utilizing the Improvement Location Certificate previously noted, and the Site Plan which was prepared by Associates in Building & Design LTD. The percentage of impervious area for Lot 20, Block 16, Craft Re -Subdivision has been calculated to be approximately 59,40%. Refer to attached calculation spreadsheet and site plan for immediate reference. This percent impervious value is higher than the maximum allowed impervious area per lot of 51% for sub -area 230 in the Sprang Creek Basin. The additional imperviousness would be an increase of approximately Ills for the lot and adjacent one half (1/2) streets. 4836 S. College. Suke 12 Ft. Collins, CO "25 (970) 226-5334 Fax (970) 282-0311 www.sheaiengineering.com PAGE 2 August 30, 2001 Project No: 1798-09-01 Re: Lot 209 Block 16, Craftt Re -Subdivision; Ft. Collins, Colorado 338 East Pitkin Street Because this site (0.16 acres) is only 0.15% of the entire sub -area 230 (110.20 acres), the increase in imperviousness and its effect to the entire sub -area is negligible. An average impervious area within sub -area 230 would increase to 51.01% if a weighted impervious area was considered for the entire 110.20 acre sub -area. (0.160.594) + (0.51 x 110.04))/ 110.20. However, because the SWMM model was run with a percent impervious value of 51.0, and because the resultant percent impervious value for this lot 59.4, we are respectfully requesting a variance from the percent impervious value of 51.0 for this lot. The following documents are associated with Lot 20, Block 16, Craft Re -Subdivision and are attached for your immediate reference: • Impervious area calculation (spreadsheet) by Shear Engineering Corporation • Improvement Location Certificate; RJL Surveys • Site Plan; Associates in Building & Design LTD • Spring Creek Master Drainage Plan exhibit (Spring Creek Master Drainageway Plan) • Spring Creek Basin SWMM with corresponding data tables If you have questions concerning the Final Drainage report for Lot 20, Block 16, Craft Re - Subdivision, please call at (970) 226-5334. We would appreciate release of the building permit for this site as soon as feasibly possible. Thank You for your consideration. Shear Engineering BWS / dh attachments cc: Associates in Building & Design LTD IMPROVEMENT LOCATION CERTIFICATE PROPERT'i DESCRIPTION: Lot 20, Block 16, CRAMS RESUSDIVISION OF LAYX- PARK ADDITION to the City of Fort Collins, County of Lariii*r, State of Colorado SOURCE: Land Title-FC198285 10'-3o` 1 (2) (iIII roumo ►IN I Bo' J 16.0' 0 0 r la FRAUE SHED ON CONCRETE o 3 ZO.O' g 34.0' 7.O O Y f STORY "FRAME At BRICKI.3 -a + W/ BASEMENT 1-S' ; 11.0' h 0 ' X_"" x 17.0' `i 0 .i i♦ 1. '.r f-- IJ) w z O W W Ld t ITKIN STREET Lender:%Bolower: Bei:tit-h ille Co.: La I IIEnESY CEnTPY THAT TIc3 IW110 10ENT LOCATION CERTIFICATE wA•5 n pAnEOFOn Dal. 19efllth THAT IT 19 NOT AtAMO SURVEYP{,ATDnM+IMPrgyEMENt B VRVEY ALAI. AND IT IS NOT TO SE MEL10 VFOI4F011 NE ESTAflIS7fMN+T Or FENCE. WILpNO. OR pTIER iVTIAf ffDr OVCMEI1T LINES. I"U"t"ER C7?"rT THAT THE I FIO'ALIENTe ON THE AD" DESCRISEO r'MCEt. OU UUS GATE �O EYCEPi \iS111lIIt//1/J U ACFIOA OUGHT IONS, ARSE OESCrUBED McMpES b0Y1L1►alo c°MENTb On nrn AOJO+NIi+ TE415E S,IEICEAi'T AS NO'TE^O—, A110 �."►.D� pEG�+y���/i/ ErICnOACNMfNTf UPON 1N TINT TNCRE b r+D APrAREtn EV10fI+CE DR fICN a ANY EASEMENT CROSSING On OUnOENU+O MY PAnt Or SAID rMCfl �� �P •.......SrF EACEPT AS NOTED, , n'4_ 9�i� ACCDRDINO TO V.S. DEPARTMENT Or NOVSINO AMC VrISAN OEVELOr'MENT FLOOD IIISUMNCE MTE MAPS.7)U5 PnOEEn TY V =� �l �'� ���i 1$ LOCAINO IN THE VOLLOw1++0; rANfI I: DP> O I D Z� Dry--- \ It DATE: 1$ `� � ;Or+E _ �� _ n RJL SURVEYS U '� f av, )Y IIiC�nlenml?rivc,Suitcl) �,,)r -���=� Plpi CUllinc, L.OIO ry, t1p N(fi25 "i rill+••.n..••" ��� DATE C)c �� TL•1: l970) 226.3M7 !� FAX; (970) 226-3027 •' ::I.•... ,: , 338 E Pitkin Street, rt. Collins, CD 16,611 ■ 11� )i1' Cam' r m"N arPRQr Job No. 1788-09-01 Shear Engineering Corporation 8/30/2001 Designer' dah 338 East Pitkin Street 12.24 PM Percent Impervious Area, (ROW and Sidewalks included) Total Lot Area Lot Dimensions �--�" x 140.00 ft Lot Area 7000 ft` Remaining Area up to 1/2 ROW 124 ft2 of Ptkin and Peterson Total Impervious Total Area 1840o ft2 pervious Area New Garage Dimensions 24.00 x 23.00 ft Area 4 552.00 ft2 Drive Dimensions Prop. 1 8 001ft x 22.17 ft Area 9 177.36 ft2 Drive Dimensions Exist. 0.00 ft x 0.00 ft Area E0.00 ft2 New House 13.50 ft x 39.00 ft Area 1 526.50 ft2 Dimensions Proposed 3.00 ft x 13-00 ft Area 2 39.00 ft2 19.50 ft x 36.00 ft Area 3 702.00 ft2 Existing House 11.00 ft x 17.00 ft Area 5 187.00 ft2 IDlmen"ns 6.00 ft x 30.00 ft Area 6 180.00 ft2 1 30 x 5.00 ft Area 7 6.50 ft2 24.00 x 28 00 ft Area 8 672.00 ft2 Walk Dimensions Prop. 0.00 ft x 0.00 ft Area 0.00 ft2 Walk Dimensions Exist. 9.00 ft x 10.00 ft Area 10 90.00 ft2 4.50 It x 13.50 ft Area 11 60.75 ft 6.00 ft x 11.00 ft Area 12 66.00 ft2 8.00 ft x 1 7.00 ft Area 13 42.00 ft2 2.00 x 5.00 ft Area 14 10.00 ft2 3.00 x 18.D0 ft Area 15 54.00 ft2 Remaining Impervious Area including 1/2 ROW of Myrtle and Washington as well as walks along each street. 8183.50 ft2 to Impervi s Material 17U-09-01-WQCV(Huwa Sheetl Total Page 1 of 2 11528.61 Job No, 1788-09-01 Shear Engineering Corporation 8/30/2001 dah 338 East Pitkin Street 12:24 PM Percent Impervious Area, (ROW and Sidewalks not included) Total Lot Area Lot Dimensions 50.00 ft x 140.00 ft Lot Area 7000 ft, Remaining Area up to ROW ft2 of Pitkln and Peterson Total Area 7000 ft2 Total I mperAous Area New Garage Dimensions 24.00 ft x 23.00 ft Area 4 552.00 ft Drive Dimensions Prop. 8.00 ft x 22.17 ft Area 9 177.36 ft2 Drive Dimensions Exist. 0.00 ft x 0.00 ft Area 0.00 W New Hawse 13.50 ft x 39.00 ft Area 1 526.50 ft2 Dimensions Proposed 3.00 ft x 13.00 ft Area 2 39.00 ft' 19. ft x 36.00 ft Area 3 702. ft2 Existing House 11.00 ft x 17.00 ft Area 5 18770 ft2 (Dimensions 6.00 ft x 30.00 ft Area 6 180.Do ft2 1.301ft x 5.00 ft Area 7 6.50 ft2 24.00 x 28.00 ft Area 8 672.00 ft2 Walk Dimensions Prop. 0.00 ft x 0.00 ft Area 0.00 ft2 Walk Dimensions Exist. 9.00 ft x 10.00 ft Area 10 90.00 ft2 4.50 ftx 13.50 ft Area 11 60.75 ft2 6.00 ft x 11.00 ft Area 12 66.00 ft2 6. x 7.00 ft Area 13 42.00 ft' 2.00 x 5.00 ft Area 14 10.00 ft, 3.00 ft x M00 ft Area 15 54.00 ft2 Remaining Impervious Area including 112 ROW of Myrtle and Washington as well as walks along each street. 0.00 ft2 Total Impervious Area: 3365.11 ft2 % Impervious 10/ Material 1788-09 -o 1- W QC V ( H uwe Sheets Page 2 of 2 • CO) . •.-Ir 'rat � •: .. .. •\ �( � is ; .� : • �. •�' ,,�, -' ;. ,.-: / fit:,.'. 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.250 .leg .300 .51 .to .00100 1 71 171 6360-0 62.1 65.1 .0220 .016 .250 .100 .Ica .51 .50 .00190 1 73 I72 6660.0 76.3 60.9 .0200 .016 .250 .100 .300 .31 .40 .90110 1 71 173 3000.0 2I.1 so.@ .0700 GIG -750 .100 .100 .21 .50 .cc I$* 1 T6 376 2920.0 9.7 90.0 .0150 -014 .3D0 .100 .700 .51 .7p .0011* 1 76 373 1606.0 H.9 $0.0 .0209 .010 .230 .100 .300 .51 .50 1 7f 217 1659.a 33-7 2$.9 .0100 .D19 .250 .100 .300 .31 .30 .Deice .00100 1 17 377 1710.0 11.1 10.0 .OIDC .016 .250 .log .100 .51 .50 .00160 i 75 Lid 1500.0 169.1 60.0 -07DO .016 .ISO .109 .300 .SI .60 .00100 1 70 179 9160.0 61.3 60-0 .0200 .019 .250 .100 .IOU 51 1 10 Sao 1160.0 0.) 90,0 .0150 .016 .250 .L00 .300 .91 .50 .30 .00190 .09190 3 so 153 9500.0 66.9 11.0 .0290 .016 .230 .100 -300 .21 .50 a60 1 go 079 239010 30.1 do.0 .0200 .016 .2so .100 .300 .31 .50 .00 .00160 1 61 {0 01*0.0 21.6 90.9 .0100 .016 .290 .100 .3D0 .31 .50 .00310 1 U 361 197.0 1.9 70.9 -0300 .414 .130 .100 .300 .51 .50 00110 i 63 341 )160.0 10.3 60.0 -0200 .OLD .ISO .100 .300 .91 .so .00140 1 96 306 1590.0 11.2 90.0 .*Lee .014 .2SO -100 .300 .SI .96 -00110 1 61 to SM.0 4.3 2.0 ."to .OU .250 .I00 .300 .51 .50 .00160 1 f6 t0 la5t.a It,1 55-6 .0000 .016 .350 .100 .100 .51 .20 .Delta 3 67 240 1120.0 »-7 55.0 .0060 .016 45C .100 .300 .31 1 d9 ago 430.0 I3.t 36.0 .9010 .016 .250 .100 .300 .01 .So .So .00160 .00150 3 Sae 402 3000.0 641.3 99.D .0700 .011 .230 .100 .300 .S1 -50 .Delta 1 I" all ISOO.D 24.6 90.0 .0200 .016 .350 .100 .300 .$1 .90 .90120 1 206 do, 5000.9 35-6 73.0 ,020C .016 .250 .100 .300 .51 .90 .00140 1 300 615 9000.0 S6-9 63.0 .Palo .016 .750 .100 .300 .91 .so 1 206 106 2600.0 21.1 10.0 .0140 1016 -250 .100 .300 .il .SO .00100 .00110 1 207 607 9100.0 37.6 90.0 .1700 -016 .250 .100 400 .31 .50 .Dole* 2 iDl "1 "ad .0 60.3 36.0 .1120 .Old .250 .I00 .300 .31 .59 .Mae 1 • 1 0l 3 211 909 61a 611 9e00.e ]500-0 3100.0 5. 4 f .10 R.0 61 .0 to 75.0 .010D .ciao .elf .019 .50 .2350 .100 -100 .300 .300 .51 .51 .5 .509 .0010 1 .Delt4a 1 312 412 6666.0 91.4 91.0 .also .0300 .016 .016 .350 ISO .100 .100 .200 .300 -51 .31 .16 .50 .90140 1 .001*0 1 113 all )501.0 U.1 70.0 .0200 .016 .Ito .100 .3o* .21 .30 .00150 1 216 616 as".* 41.0 10.9 .025C .O11 .210 .100 .300 .91 .so .001t0 3 3IS 426 6000.0 16.7 $5.0 -9100 .016 1350 .100 ,Sao .52 .30 1 319 tie 9000.1 ]1.1 70-0 .Oloo .916 .250 .100 .300 .$1 .10 .00160 .60110 2 W 417 6SOO.0 57.5 41.0 .0200 .016 .250 .100 _100 -51 1 lip ale Igoe .O 11.4 •0,0 ,6200 .G16 .730 .100 .100 .51 .80 .50 .00180 .00120 1 Ill 419 4300.0 40-9 79,0 .0250 .C16 ,3t0 .100 .300 .S1 .50 -00180 1 230 67o 214410 32.7 *$.a .D350 .010 .250 .100 .100 ,sl .30 .00110 1 231 621 6900.0 61.1 6s.a .Palo .016 -190 .100 .300 ,S1 .50 .00130 1 322 UI 700*.@ 59.5 53.0 .Selo .016 .:So -109 .500 .52 -50 1 323 S23 7300.0 74.9 65.0 ."so .019 .25o .100 .Ion .61 .so .00110 .00100 1 lad 626 4000.0 31.6 56,0 .0200 ,016 .250 .100 .300 .51 .50 .90119 1 225 625 210010 2/.1 50.0 .0300 .01E .210 .100 -Ica .91 .50 .00140 1 226 425 *000.0 9t.1 47.9 .0350 .016 .:So .100 1300 .91 -SE .00lso 1 227 427 5000.0 at,1 56.0 .0150 .elf .299 .100 .30* .51 1 122 426 2900.0 2*.5 43.0 .0100 .014 .ISO .Ica .300 .51 .50 .50 .00190 .00110 1 329 770 629 130 6000.1 U.1 9o.0 .9250 Old .230 .100 .)Do .32 .30 .00169 1 300E011 110.2 31.096M.0100 .016 .250 .100 .300 .52 .50 .00160 1 332 632 3794.0 33.S 27.0 .0100 .cis .3SO .109 .300 .52 Jo .001t0 1 223 e33 31oo.0 33.9 79.0 .0200 .016 .350 .200 300 1 239 119 3500-0 3S.7 03.0 .also .Old .250 .100 .300 .51 .91 .SO .50 .00160 .001SO 1 215 715 2709.0 2216 $1.0 .also .e14 .200 .100 .300 .31 .50 .00110 1 236 636 )000.0 20.6 19.0 .0300 .016 1230 .100 .I00 .11 .50 .00160 1 131 637 S300.0 34.6 60.0 .0300 .016 .350 .100 .300 .61 .50 1 240 760 7000.0 67.1 76.0 4300 ,Old .250 ,100 ,300 .31 ,00160 1 211 111 3600.0 54.1 33.0 .0200 .01E -250 .100 .300 .51 .30 .50 .00160 .Mae 1 263 442 1250.0 2.3 90.0 .0200 .D16 1290 .100 .300 .51 .50 1 363 663 coca.* 36.1 35.0 .code .elf .230 .109 .100 .51 .00310 1 366 740 2200.0 2s.7 56-0 .00*0 .019 .390 -100 .100 -51 .90 .10 .02100 1 216 665 2406.0 22.3 72-0 4asa .010 .250 .100 .300 .e1 .10 .00100 .00180 1 216 666 660016 66.7 52-0 .0010 .016 .ISO .100 .30a .52 .10 .00190 1 it, 447 330a.0 36.2 d0.0 .0130 .016 .2s0 .1 D0 .IGO .12 .10 .Gallo 1 269 961 3000.1 30.) 70.0 .0090 .016 -250 .LOG .30C .32 -50 .00110 1 213 967 1000.0 35.5 97.0 .2190 .016 .210 .10c -300 .51 .30 .00160 1 ISO 450 2500.0 ls's 67.0 .0030 .oil .250 .100 ,300 .51 1 all 661 Igoe.* 60.1 Ea.0 .0110 .oU .350 .100 .100 .51 .50 .SO .00120 .00/so 1 232 as; 2200.e 22.0 role .O1 ]0 .014 .250 ,100 .300 .11 .50 .00100 1 233 913 MO.• $3.7 66.0 .0130 .021 .250 .190 .300 .11 .4o 00110 1 9SI 316 3500.0 29.3 15.0 .OS00 .elf .250 .400 .300 .51 .10 .Calso 1 all 619 3200.0 2S.5 10.0 .0100 .016 .250 .100 .360 .52 .90 .00100 1 •TOTAL ■aiR M TOTAL T73I1aT11Y MS. (Ac 911. 130 YL (310vIR). 9440.10 093I110 AIR 9YCROLFA3C TOM Y9179TZ .. 1a0•Ti51, 3.67•I)M_0 00K149tD C101012TIO1 91ma95O1 C03413 rING RO31RRt, idle. JULl6 1999 - PILi,0C9s01n0 - Da61.N9C9132 ••• Cox.:N== am= TOP dUUemwoca T GOMM IM UDEW,2-pc M M •-• RA6 2 og 54 Page 2 Of 54 Schlueter - 338 West Pitkin Page 1 ".' From: Michelle Becker To: Troy Jones Date: Thu, Apr 13, 2000 9:21 AM Subject: 338 West Pitkin If Below are Glen's comments from conceptual review on Monday. 1. This site is in the Spring Creek basin where the new development fee is $2,175/acre and it is subject to the runoff coefficient reduction. The site is in inventory grid #8J. 2. The standard drainage and erosion control reports and plans are required and they must be prepared by a professional engineer registered in Colorado. 3. Water quality needs to be addressed. The usual method is extended detention but in this case, other BMP's may need to be explored. 4. The site may need onsite detention to address the increased runoff. The Spring Creek masterplan has an assumed runoff coefficient so if that is not exceeded onsite detention may not be needed. Also, all the existing impervious areas can be counted so any area that is eliminated, like the garage can be traded for new structures. 5. If the alley is to be paved, the grading may be difficult to accomplish and still maintain existing drainage patterns. This may also require additional surveying to get enough information to design the alley drainage. CC: Glen Schlueter o� toC) o 14r% 0 a d` g 1 II 9 8 NEW RESIDENCE t �t.33 pry , y^ NEW GARAGE I $ -row = 0 _ Z-'Io L� i N L; T.ow-IoZ.o1 4 EXISTING RESIDENCE TO REHAIN AS IS T \ EXISTING OONLRETE �O\• PdilO \�r�5 PITKIN STREET I SITE PLAN GI y�0.-0' WIDE 0 1p /Tofu oF=u1=5 Elgv. m Z N IL IL +CtE�v` BERNTI-I RESIDENCE NO REVISION DATE A.s�oanTG.S � bmzi\r4%Z DC.s14td LTD. A�) 4E{D3 INNOVATION DRIVE, SUITE 7 FORT COUINe, CO B0525 970 225-2323 FAX 970 225.2395 SHEET: I NO: I I FINAL 6.12.01 330 EAST PITKIN STREET FORT COLLINS, CO 50524 BERNTH RESIDENCE NO REVISION DATE .4S.SOUnTv N ) B�tc�n6 DC--i4tI L-TD. A� 4903 INNOVATION DRIVE, SUITE 1 FORT COLLINu' co 90525 970 225-2323 FA% 970 225-2395 SHEET: 1 NQ; I FINAL 6.12.01 339 EAST PITKIN STREET FORT COLLINS, CO 50524 BERNTH RESIDENCE 338 FAST MTKIN &TREET FORT COLLINS. CO 80524 NO REVISION DATE n7 baziltz Dc� LTD. 'L1'tY'�i'/ 4803 IMMOVAT40N DRIVE, SUITE I FORT Column, DD B0525 970 225.2323 FAX 970 225-2395 SHEET: 1 NO: I 1 FINAL fo.12.01��