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HomeMy WebLinkAboutSite Certifications - 06/24/1993, Northern Engineering Services,� Inc. /v June 23, 1993 Mr. Glen Schlueter Stormwater Utility City of Fort Collins 235 Mathews P.O. Box 580 Fort Collins, Colorado 80522-0580 Sinai Approved Report re: Kingston Woods P.U.D. ()ate ��l3 inage certification Project No. 9315. 0 430� `vJ S c r v Dear Glen: Northern Engineering has performed a field inspection and survey of the constructed drainage improvements for Kingston Woods P.U.D. The intent of this work has been to confirm compliance with the design intent of construction plans which were prepared by this office in August of 1992. Two sheets of drawings have been red -lined to show the extent of this work and the results of the survey and are attached to this letter. Volume calculations for the detention pond are also attached for your review. During construction of the project, it was discovered that unforseen conditions to the west of the site caused the drainage from an existing driveway to be blocked. As a remedy, the drive surfaced was elevated, a drain pipe placed under the drive and a small swale was placed to carry runoff from the drain pipe into the Pleasant Valley and Lake Canal. Calculations were made to assure that the invert of the swale would be above the water surface in the canal. Since the sediment trap located at the outlet from the detention pond was in place at the time of the certification survey, it is undetermined whether or not the orifice plate has been installed. In order to control outlet flows from the pond during the time that the sediment trap is in place, it is recommended that either of the following measures be taken: 1. Remove the sediment trap, install the orifice plate and replace the sediment trap. 420 S. Howes • Suite 106 • Fort Collins, Colorado 80521 • (303) 221-4158 • Fax (303) 221-4159 Kingston Woods PUD Drainage Certification page 2 2. Constrict the opening into the standpipe of the sediment trap with cap with a 7-inch opening. Prior to the construction of either of these options, it is understood that the developer will escro 150% of the estimated cost to install a control device. We esti ate that either option can be placed a cost of $200. T e scrow amount, therefore, should be 300. 00. We find that the constructed drainage improvements have been built in substantial compliance with the design work which was prepared for this project. Work remaining to be completed consists of seeding of the disturbed areas. It is our understanding that a letter of credit has already been submitted to the City of Fort Collins which covers 150 per cent of the cost of this seeding. If you have any questions or comments as you review this material, please contact this office at your earliest convenience. REj�'P,, Sincerely, `���.�`°�Q,0O NORTHERN ENGINEERIN SERVICES, IIp�o'�P�� V00 n 5 � awz o Michael F. Jo rs,P.E. 90,c�•• '; LIAs� A -z-7, ; l 2&.37 '31 � S,' ', IOJ •�f,� t V,>j L-, (c 1 !o , -yzaz 3, (� ) ,+ caPo�c N. L !ate mot' lc.lw4S�jv.a � c�a� c�r.�,.f 2S l.2 .g yG 3. TPa 15 - A n-),J Z4- Irvc- ,A p orx ej (L-;- 5 F'� k—1 N D W Lam' To C.,Sh GL 1 ti.. )ej N' ` At(v`:ZIrp4-: &f) j; PI�Z `LDPZ t� too qjz tuv-�, 1 A s 4z b�� _,_; 4- Z 95 w w 85 0+ .}; q- Z 95 J w 850 POND SECTION ##2 LOCATED 19' (AVr-) FRnAA F FNn np- Dmin 90.5 ARE =329sq. ft. w-rvv U+OU 0+80 1+00 STATION FROM N. PROPERTY LINE POND SECTION #3 It I OCATFn 45' (AV(-- 1 G-Dr)hA U- H.W. L. = 90.5 inn A . ARE ,, =350sq. ft. iff, • �_ ••-r-rU+OU 0+80 1+00 STATION FROM N. PROPERTY LINE Q POND SECTION ##4 It LOCATFD 95' (AVr 1 MMA r rKn, nr- nn H.W. El. = 9 0. 5 ARE =320sq. ft. 0+40 U-rov U+50 1+00 STATION FROM N. ► IFZOPERTY LINE Z O 95 Q J W 85 v-- POND SECTION #5 I nCATFr) 145' (AVG.) FROM E. END OF POND EL. = 90.5 LW. REA=20 s > ft 0+00 0+20 0+40 0+60 0+80 1+00 STATION FROM N. PROPERTY LINE Z 0 95 w J W P L 0+00 85 It POND SECTION #6 LOCATED 195' (AVG.) FROM E. END OF POND H.W1 EL. = P0.5 ARE =103sa ft. 0+20 0+40 0+60 0+80 1+00 STATION FROM N. PROPERTY LINE POND SECTION #7 LOCATED 245' (AVG.) FROM E. END OF POND H.W. ARE EL. =25sq. 30.5 ft. l 0+00 0+20 0+40 0+60 0+80 1+00 STATION FROM N. PROPERTY LINE Project Name: Kingston Woods P.U.D. Project No.: 9315.00 Detention Volume Calculations XSEC AREA AVG A LENGTH (sq.ft.) (sq.ft. ) (ft.) 1 0 2 329 164.5 19 3 350 339.5 25 4 320 335 50 5 200 260 50 6 103 151.5 50 7 25 64 50 8 0 12.5 120 VOL CUM. VOL (cu.ft.) (cu.ft.) 0 0 3125.5 3125.5 8487.5 11613 16750 28363 13000 41363 7575 48938 3200 52138 1500 53638 Sp1llwey Mush Pass r-Top of Spillway IOyr. 9.orm PunCT'P 12'PER�OR�ret] fil �WIND, — I I �Illl—�Ilr;l I I--IIII��II — FLOW 'fI� q I un I�. lien R G P I �1LI Mir I IIII 1,1 AS5re9�Ez Piled WWir@ Mesh 12 (��lin),�`6ove IoporPipe General Notes: PIPE OUTLET. WITH GRAVELFILTGR 1. Sediment shall be removed when one half of the basin design depth has been filled. 2. Removed sediment shall be deposited in an area tributary to a sediment basin. SEDIMENT TRAP Circular Channel Analysis &. Uesign Solved with Manning's Equation Open Channel - Uniform flow Worksheet Name: Comment: Line A Full Capacity Solve For Full Flow Capacity Given Input Data: Diameter.......... 2.00 ft Slope ............. 0.0134 ft/ft Manning's n....... 0.012 Discharge.........28.37 cfs Computed Results: Full flow Capacity..... 28.37 cfs Full Flow Depth........ 2.00 It Velocity.......... 9.03 fps Flow Area......... 3.14 sf Critical Depth.... 1.84 ft Critical Slope.... 0.OI16 ft/ft Percent Full...... 100.00 Full Capacity..... 28.37 cfs QMAX @.94D........ 30.52 cfs Froude Number..... FULL Open Channel Flow Module, Version 3.42 (c) 1991 Haestad Methods, Inc. * 37 Brookside Rd * Waterbury, Ct 06708 Circular Channel Analysis k. Design Solved with Manning's Equation Open Channel - Uniform flow Worksheet Name: Comment: Check Capacities of storm drainage pipes Solve For Full Flow Capacity Given Input Data: Diameter.......... 1.25 ft Slope ............. 0.0043 ft/ft' Manning's n....... 0.012 Discharge......... 4.85 cfs (",omputed Results: Full Flow Capacity..... 4.85 cfs Full Flow Depth........ 1.25 ft Velocity.......... 3.95 fps Flow Area......... 1.23 sf Critical Depth.... 0.89 ft Critical Slope.... 0.0065 ft/ft Percent Full...... 100.00 % Full Capacity..... 4.85 cfs QMAX @.94D........ 5.22 cfs Froude Number..... FULL Open Channel Flow Module, Version 3.42 (c)°1991 Haestad Methods, Inc. * 37 Brookside Rd * Waterbury, Ct 06708 Circular Channel Analysis & Design Solved with Manning's Equation Open Channel - Uniform flow Worksheet Name: Comment: Check Capacities of storm drainage pipes Solve For Full Flow Capacity Given Input Data: Diameter.......... 1.25 ft Slope ............. 0.0040 ft/ft Manning's n....... 0.012 Discharge......... 4.43 cfs_ Computed Results: Full Flow Capacity..... 4.43 cfs Full Flow Depth........ 1.25 ft Velocity.......... 3.61 fps Flow Area......... 1.23 sf Critical Depth.... 0.85 ft Critical Slope.... 0.0061 ft/ft Percent Full...... 100.00 % Full Capacity..... 4.43 cfs QMAX @.94D........ 4.76 cfs Froude Number..... FULL Open Channel Flow Module, Version 3.42 (c) 1991 Haestad Methods, Inc. * 37 Brookside Rd * Waterbury, Ct 06708 Circular Channel Analysis & Design Solved with Manning's Equation Open Channel - Uniform flow Worksheet Name: Comment: Check Capacities of storm drainage pipes Solve For Full Flow Capacity Given Input Data: Diameter.......... 2.00 ft Slope ............. 0.0040.ft/ft Manning's n....... 0.012 Discharge......... 15.50 cfs-' Computed Results: Full Flow Capacity..... Full Flow Depth........ Velocity.......... flow Area......... Critical Depth.... Critical Slope.... Percent Full...... Full Capacity..... QMAX @.94D........ Froude Number..... 15.50 cfs 2.00 ft 4.93 1'ps 3.14 sf 1.42 ft 0.0055 ft/ft 100.00 1.5.50 cfs 16.67 cfs FULL Open Channel Flow Module, Version 3.42 (c) 1991 liaestad Methods, Inc. * 37 Brookside Rd * Waterbury, Ct 06708 Circular Channel Analysis & Design Solved with Manning's Equation Open Channel - Uniform flow Worksheet Name: Comment: Check Capacities of storm drainage pipes Solve For Full Flow Capacity Given Input Data: Diameter.......... 2.00 ft Slope ............. 0.0080 ft/ft Manning's n....... 0.012 Discharge......... 21.92 cfs Computed Results: Full Flow Capacity..... Full Flow Depth........ Velocity.......... Flow Area......... Critical Depth.... Critical Slope.... Percent Full...... Full Capacity..... QMAX @.94D........ Froude Number..... 21.92 cfs 2.00 ft 6.98 fps 3.14 sf 1.67 ft 0.0077 ft/ft 100.00 % 21.92 cfs 23.58 cfs FULL Open Channel Flow Module, Version 3.42 (c) 1991 Haestad Methods, Inc. * 37 Brookside Rd * Waterbury, Ct 06708 Circular Chaime.1 Oiia.Jy!-.,j:-3 0, C)esiqil Solved wil.1-1 r"falmillq's ("hallm,4 (Ill'iJo,1111 I tow Wovksheot Name!- ll%JTiysJ-.on Isi. Comment: 24" RCP----S'I'ORM SEWFP LINE Solve ve. For A C 1, Ll ;9 .1, P I-- h F.)IpLlt Ocita- Oialflete) ...... I o p I., . . . . . ..... . 11 .. ma n I I i I iq , s 11. - . .... E) i -c, ha) <Y ----------- comrmj t t�d Resu 1. is De p t, h . . . . . . . . . . . .. . VO.L(:)(, i ty .... Flow ow ea .......... Critical DehLll ... rercent Ftill ...... F t . i 1.1 Ca p a c. i 1,-. y .. - . - OMAX @.941)....... . Fr(:)Llcle NLJlllbPl- . . . . 2 M) f , I.. f 1 75 1 1- 4 Al 87 Al 7 l< 'In —L,7 Open Channel Flow Module. Version 3./12 1.991, Haestad Methods. fiic. f, 37 BI-C)(AMide Rd e Wat-erbul-Y. Ct 0670P ­ "S I MM AW§ I who x. 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Y f- � , �.. iFe � ���� .:t L�1 ;5� ';, r M !',♦ _. ! � �.L l 'k', _. .., . � w� ��) "��1 �>J�r._..f.". ]V .::Y/� Now T1 FINISHED GRADE EVEV. \ 1 } 99 20 TOP OF FOUNDATION ELEV. /I MIN ¢5' ABOVE FINISH GRADE T l000 Phu .520 TTI 1 BLDG, SET RACK �.�. ANaE Ill AN OLUExT ' IDRIVE-OVER CURB GUTTER AND SIDEWALK y TYPICAL LOT ORADWa LOTS 6 BLOCK A / -GLAEo � [LIES- y ' LOTS 5-3. BLOCK 2 1 PAN 0.1pI"AM You x. LOTS JAE. CONC. PAN DETAIL FINISHED GRADE EVEV p0A i1 TOP OF FOUNDATON ELEV. �oG.3 iGF MILK 0.5MOVE FRESH GRADE 20' BLDG. SET SACK M E.G. = REMOVE EXISTING IRRIGATION GATE NO. 116 PATCH DITCH BANK WITH CLAY PER SOTS REPORT III IiSu; iL r-I f ii_itV; NT 2 9'O' P A0 )021 _As AN 1 Z 33.32' % os - OA - 7 Fr 5 4 ` 13 ■ 1 I ■ •• 01.2 F.G. \ 1005 F.G.' 99.7 F.G.1 98E F.D.1 976F I.v96.6 F.G. 1 AY 8/ 1012 F.G. I - PAT ON s' EXISTING IRRIGATION DITCIY NO / DRIVE -OVER CURB. GUTTER AND SIDEWALK NO MODIFICATION REGERADE TOP OF EAST BANK,' NS MI Loe rc�pt ar aCorP ITT v /vAL CANAL070 Au aF WALR 1 � ii r' SECTION B-B. eE" Il TYPICAL LOT CROSS-SECTION ALONG BF CN gR,,N31Tlp THE PLEASANT VALLEY AND LAKE CANAL Gpf OITCX REI�C qOp EC IS?lWC IB.pNT C 91A.ONSr}RUC)IpH LEGEND P�C�E�C NTR"'oWtJ" _"OWE' ---IO----- EXIST. CONTOURS O101EI�Er ISNi a DADS cGTIpN" F09 SCE -wJ- PROPOSED CONTOURS Al --- PROPERTY LINE B0N01I caMlEol lml• W .lmRR Mr �, s EXIST CURB. GUTTER d WALK '�"*<'? A°`MN �,v, r'a°iv�'"Te 1 ,I CENTERLINE OF ROAD a,.,,� ET M DONAWu � Il ."°" ^°OW ' At ---------- HISTORIC BASIN BOUNDARY w,'�1r'� 1 ,B""r'°",R"`.. ," ,1Avl. Carl .AIR t -� DEVELOPED BASIN BOUNDARY SAArAAASAWIMILSE, ' INor I we ALL R So 1 �! RUNOFF FLOW DIRECTION n.RA VAL 1Y my NN .A. ..® Pr d Q DESIGN POINT Nux.e }p BASIN DESIGNATOR APPROVED BY PLEASANT VALLEY A LAKE CANAL B�. L BASIN AREA: AC THIS AY OF go, AD 1992 F.G. ADDS F.D. Jl11 ) I 1s 10 AN_.__ i y OY 21 I ' 221 , 9 1 1021 F.G. 1 1018 F.G. 1025 FG 1Ol f.G. 22 ` F.G. D.15 I 11 1 55 III 11 II )III 1 r 11 ________-- - - If al t 6.01F.G. W.G. i%I F.G. f 97.2 -a"F.\G. I'�l'1 962 F.G. I� 14 I? 2 FAIOL] F.c. �00.9 FG�N�1[ 7 28 I 8 1 NIP I D4 10I�_ i LOCKs 19 BEG. .31T - Al -L d9 IFG. r 1 2 C v 14 h 4 PLA Lw "N@ 9Mi 91 •� �.,•. 0 F.L, A 9 I 9J., MT2 F. G• j ♦ CM rlE FL DE L0 A IS 4 � gas F.c. '' "�, 5 � P\- f .Al 1.8 BLO '2 't 929 FC yff°i`u Pit ;t , SIR Lin I/ 96.9 F. 96.9 F G. T D VIR E .B 19B.9 9 ] _ 1 1 ' 9S,E F.G. ' 97.0 F. r g _ , 1 _ y BD 5.8 FNf 1I 1 9 l 3/ - a _ 9`4.0 F.G.' \ fuF.G. - B .a. 7 WiQrlP:xd7YL.L.t. /"hat _ _ ,r - - 50 R.o.w. -p6. '�� �' x.B - - `sG R.9.c- _ Ce _ STORM SEWER WILLIS SMITH' fL ��N41 - �S Tin} --s ^ � r,41 ral 1 _05) 1 ROAD for _ _ - - Se on uLvwT - )V _ ' f _� N39°441 Yv Ij�- 10J4.06' I ` -_- NOTES: - - _ - - - )BEE sxt la - R _ - _ '� - - NO.97E EXISTING 91RIBAiR)N GATC I. MAINTENANCE OF THE DETENTION POND B OPEN TRACTS SHALL BE THE H0. N>. % .d RESPONSIBILITY OF THE KI NGSTON WOODS NOMEOMNERS ASSOCIATION <d" .r TTx15yw ie'.0 x'Ba c0.VBi a+ .df °n �°` J a 1 .+wefrnr6zOrr T VALLEY 6 LAKE CANAL IS TO BE �1 '-------"----------- 2. EXISTING PIP RAP IN THE PLEASANT ATHE �GnRE Iw - ---- ----- -- ----- J_.h,L1.1 JE- VILLAGE .U.L. wRPS IAFE 1 1 Mmu I MUSLIM I an[ I I RELOCATED TO THE NORTHERLY BANK OF THE RELOCATED CANAL FROM STA L�Ti ("4GIIl/1r- 5�I - c r'1 IIf=� 16.40 DI THE BON CULVERT. AS SHORIN ON THESE PLANS. - T L,,,,102 B.Ll AREA B I i k1 Will I I t 1 k t [ P It Tel life I] IIN I [ W M11 ..� m 3. THE SEDIMENT POND SHALL BE CONSTRUCTED WITH THE FIRST ERASEUsti ml..rfr IPi.K 1s1 Ill! 111 bb111N1lift) Itl Ilpb11111f11 III IIp11MUllalal b111 IIIAIIIAI Ildsl hbl MaRoJ� � OF DEVELOPMENT. DISTURBED AREAS Of THE SITE WILL BE SEEDED AS -_-'-' --' """' --' -'---------- --- DESCRIBED IN THE DRAINAGE REPORT. tl=Tu 11N11 I 1 1 wr ISSN, I 11CIN wN'w I III.A. ILLS IN Id I1.6 1111 w 1 1.1 I'L I w l N 1.1 I 19.0 21.2 11.0 4.0 H.R I 1.11 LIDS 1NWEYIM 4. LOTS IN THE AREA OF THE PLEASANT VALLEY B LAKE CANAL MAY BE SUBJECT k I.A.51 IIAM IN LS 11.4 16.11 w I 1.1 1.11 1.11 25.1 15.E 1I.N I.0 WAR 11,R 11.51 TO SHALLOW GROUNDWATER. IT IS E MADE THAT A DETERMINATION OF I In 6 I NINNIN Slml I I N I II.0 16.I5 IN LI 11.1 11.11 } I L1 4.51 1.1115.1 15.E 11.6I 1.M NA I I.If 11.11 a I ' I PROTECTIVE MEASURES. IF ANY. BE SLIDE WITH THE ASSISTANCE OF A LP.I Bit I t t { k1 ASIDE I 3 1 k I f 1 k IIN ION It IIN I G 1 Y IIN N I LD 11.15 In 13 ILI 11.1Iw 1.1 1 A.$ 1 1.1I IL5 11.1 It." I.fl ILW 14.15 I1.11 1 DUAL IFI ED SOILS ENGINEER. Irl -.. DIMIMWNI..... III11JIN......1fit 11p.NNllkkl.Net111A111M1 lies) fall) A 1 1.61.... IN to NA 11.1I IN 1.1 11Arm 1.1IILS ...1...W LN.....I B.IS ILO ' ................................................................................................................ 1 11.WI..........INNI rIr11W MN111r111eel Wr rNN. IN HIRf1111r1 ...................,... I1.11 I.H 5. PRIM TO CONSTRUCTION OF 10' RADIAL SWING GATE. ITS DESIGN MUST BE APPROVED I I I I I I 1 1 S I I I,.........INO OW111N N N tllml NO 1MM. WE HlHlallw ....................... I I.N I." I BY PLEASANT VALLEY AND LAKE CANAL COMPANY. R I I B.011.11 IS I.1 1.5 6.11 1.6I in 1.41 LN ILS I nA I1.] II.0 I.N 11.1111.E LN 1 I LW NAT IS IJ 1.1 I.S 11N 1.4 I's Be I 1J I I61 IL5 II.N SM 11.111 I.1I I.9 'Men IT 1 1.14 11.11 1511.1 LI 1.41 1.1 I IN 1.H 1.1 S.$ 11.1 1.1 II.N In ILI) I LN 1.0 1 1 1.41 If.N 11 1.1 LS 1.1 11N 13 1.1 1.1 I 1.4I 11.4 ILI 11.0 LN 11,111 Let Lll at 10.4910.10 VI 1.4 I411 11.11 1.11 1.6I I4.1 11.1 ILU [.II II.11 11.11 1.11 1 1 1.11 II.M If 1.1 1.1 1.1 I All1111.1l 1.0 ME 1 IL5 11.1 11.41 B.II IPA 1 AM 1.91 w REQUIRED VOLUME...................__1 )IJI I0.lt s11 1.1 EI.1 Ll 1 1.1 I f111.11 1.5 Lf 111.1 D.S II.N l.N 1LIS 11.N II.N SAT � DETBRIDN PD10 151 LN 11.11 II 11.1 9.1 LI1 1.11 III L11 L1 BE I ME 16516N LN NA I I'll 410 ED.%I LATE /.I1 Mr..� II 1 pit .. • • ca. ft. 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O,E - - HTPH Ei6-,- NORTHERN ENGINEERING I NEER I NG SERVICES I CES EAST OF`SENECA Pro Ject: 9123.04 Print Dote: K91 u1998 GRADNG B DRAINAGE STREET. 420 SOUTH HOWES SUITE 106, FT. COLLINS. COLORADO 80521 Sc01 e: F•50' _ Deel ner: MVK Chocked by: MF. I 1 - (303) 221-4158 OrnPtennn ItVK I D..nn..A .UI1V m LfIT l T SHEET 13 BEE sxEET H of A FOR FOM PAND FAN DETAIL Jill Ir M e0' .OT 2 H' CL L RCF. LNE'A' Scale. 1' _ SO ISM WHEY a FOR PROR' D LDT 1 4 E 4 91. - 1,19 - -RAVEL GUTTER DIKE - (TYPICAL) ER _fi -- =SHELDS BENCHMARK ISC o SE COR. OF SEC. ]1- OF INTERSECTION OF NORSFi0 I ELDS STREET)00CHMARK IS I.3]' IRgER THAN CITYT - City of Fort Collins. Colorado UTILITY PLAN APPROVAL y AFSIOV40: n1AN CIIIICKBD A CRICKED BY:.a�._.:�l�_ WICKED BYr J�[r KINGSTON WOODS P.U.D. GRADING AND DRAINAGE PLAN Sheet 12 16 00 F I'✓4"'(IOK lE