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HomeMy WebLinkAboutDrainage Reports - 12/18/2001 (3)id-!x)A� STORM DRAINAGE AND EROSION CONTROL REPORT FOR LOT 1 OF THE K-2 INDUSTRIAL PARK 1012 NORTHEAST FRONTAGE ROAD LOCATED IN THE BOXELDER CREEK BASIN PREPARED FOR J.B. EXCAVATING PREPARED BY STEWART & ASSOCIATES 103 SOUTH MELDRUM STREET P.O. BOX 429 FORT COLLINS, CO 80522 TEL. 970-482-9331 FAX. 970-482-9382 OCTOBER 30, 2001 1 1 1 1 1 1 1 1 it I�1 Table of Contents Pages 1 and 2 Cover letter and text of report 3 Vicinity map 4 Historic site calculations 5 Developed site calculations 6 City FIRM map 7 County FIRM map 8 Elevation Certificate Pocket Site Plan Grading and Drainage Plan 1 1 1 1 STEWARTMSSOCIATES Consulting Engineers and Surveyors October 30, 2001 Mr. Basil Hamdan Stormwater Utilities City of Fort Collins P.O. Box 580 Fort Collins, CO 80522-0580 Dear Basil, RE: 1012 Northeast Frontage Road Lot 1, K-2 Industrial Park Mr. Jim Bath of J.B. Excavating has purchased this site and plans to move his excavation operation onto the site. The existing site consists of 2.48 acres which has two existing buildings with some concrete sidewalks and the remainder of the site is gravel surfaced. The zoning department is requiring the installation of some additional pavement on the parking area and on the driveway to the existing building. We propose to remove some of the gravel surfacing on the front portion of the site and replace it with landscaping and vegetation. Enough of the gravel surface will be replaced with vegetation to maintain a composite runoff factor for the site at slightly less than the historic runoff factor which now exists. The site is located in the Boxelder Creek Drainage Basin, and is in Flood Zone A4. There are no new buildings or additions to the existing buildings proposed. There have been some landscaping berms constructed in areas where the gravel surfacing was removed. AYRES Associates has made an analysis of the impact of these berms on the water surface in the flood plain area, and found that the berms will not cause a rise in the flood water surface elevation. The existing site and also the proposed developed site drains from the southeast corner to the northwest corner. The runoff is into the East borrow ditch of the I-25 frontage road. There is a low sump area in this borrow ditch and in the adjoining property to the East of the borrow ditch. This low sump area extends to the North from the Lot 1 site. Given a large enough rainfall, this sump area would fill up and overflow to the South. The depth in the sump at overflow would be about 5 feet. Because there is no outflow for the runoff from the Lot 1 site, we propose to provide enough new landscaping and vegetation on the site to more than offset the added runoff caused by installing the required paved parking area and driveway. James H. Stewart and Associates, Inc. 103 S. Meldrum Street • P.O. Box 429 • Ft. Collins, CO 80522 970/482-9331 9 Fax 970/482-9382 We are not providing onsite detention because of the proposed decrease in runoff from the site, and a variance is requested for this deviation from the City Stormwater Criteria. ' Also there are no water quality measures provided on the site and a variance is requested for this. The offsite sump area will act as a water quality settling basin. tThere is an offsite flow onto the Lot 1 site. This offsite flow will come from the property to ' the east. This offsite flow will have no adverse affect on the Lot 1 site, and will remain the same as it has been historically. The proposed development on Lot 1 will not effect the offsite flow. ' Erosion control was provided during the installation of the landscaping and seeding on the west portion of the lot. The landscaping has been completed. ' Calculations are included in this report which show the historic existing runoff coefficient and runoff quantities, and those are compared to the proposed developed site runoff coefficient and runoff quantities. Also included is a copy of the FIRM map for this area. The FIRM map dated March 18, 1996 indicates the site to be in Larimer County, but the property was annexed into Fort Collins in 1997 so ' copies of both the County and City FIRM maps have been included. A copy of the Elevation Certificate for the Lot 1 site is also included in this report. I A plan of the Lot 1 site showing the proposed development and drainage patterns is included in the pocket of this report. This report for storm drainage and erosion control was prepared in accordance with the City of Fort Collins Criteria. ' Sincerely, Richard A. Rutherford, P.. & L.S. RAR/meh \' \L, one ildlife Area �� \s Giddings \ 171i 3Jp. j' - �rj \\\. r•• b/a ° ..:\' x5rJ7 1,2_50_ -' �\ --- cS''\\.- — 34 o - ` UNyo°o ry it z i��\ 0 V f1TAl <9� �TIS-iH '�-.+°�• _ I .:I-`°/,' I 1 ° ii n u� it II 5079; It H !I ;ISt a ame ^ Fish n it 'I II :I pen nental Nursery ,• e�rnn II \ II _ I Q / i ack allow / i �•(� �o —_J` o;.p , �•; Junction �\\ � p DR / I ' o Io 494/ yI \ -- II Sinn `�.'1 \ ��\ L DO a�aaaae� 19 i I t o eta n Ce l • J �� � � • i i� - � `7-3 / I I �� .-n, oxeldery j�; I !„ ^•� 4. 4939-•\M;I�LBFRRJ s9 �,• .—�� j.. —�`_ Trai ;-• • railer q • ° 1� ('\=e7i� /---� i' 1 - {L Park /� �i \ !r•! . ,.. •� 71 :�i!� •I• �iCi•II.1 a d _ ,./:___"\I �'1�\\.. 141r I . ' �REs .evaar• r. iiv � � �� � r s t _ ... s e\ J II I a ai\Q �• IJ J�� ,. \ •VI \ U 15 14 1 1 1 1 1 1 1 1 1 STEWART&ASSOCIATES Consulting Engineers and Surveyors 103 S. MELDRUM, FORT COLLINS, CO 80521 PH. 482-9331 FAX 482-9382 By: P/ IZ Date: 3 O Client: S 3. Exe-o v o 4) n a Sheet No. 4- of Project: Lol- I K Z PQ r-�- (/ 01 Z n/ F - GrV r4acP rz�_ Subject: isO rl C S )fie S r g7_1 ;-. 1/ I_ ,1_. 1S ,T 0.,_- C Jura✓cl svrQ F_tv�M s_ou'eG r Lfono*~`tiwes _ s 1 o pc z 250 1 _ : ! -- — -Qw_ _ G_1. i/_ , 0 = i' 5; (z. 3 )(Z ,��}9� - I 3 _ j c-f s _ I �r_t C ! a I I ! -I--- 12S-()_ 53K, 5 ) I z. I i - E, r- r i i r I I 11 I I i I i I I I I I I I STEWART&ASSOCIATES 10 S. M 3DRUM, FAX FORT COLLINS, CO 80521 Consulting Engineers and Surveyors 11 By: / /Z Date: G 13 0 0 Client: s r,X Cot a t-✓ % n 9 Sheet No. of Project:_Lai- 1 o- j KZ /n Fo d s ' c/ i- (/412 All Fr-om J?oo Subject: 7e Sze l o p e �+ Jam)4 i9r�a - r _a.c i__.{ ._._ o i '. _�� 'µ 1_e3jl : 1 s F-i I ..� i : 1 a n_ f3:0_SF I G U I I -t(al z 1,�_(ao. o� t(�3coJ%.5s�.t_ o?�.(o_ed�+ �.3_G.B��C-o zs _!_1_I_ L — `I S_._ I G'Uff I— i"�l✓PI SV,HoCC{ io I-2 —�GL /- -= , -_�QiSZ_,d?Z �-'��2--��8__- 5�_J� <::_ �I I I i F-I� Ifr 1 p m = = = m m m m m m m m m —Boselder Creek Overflow Channel \ THIS AREF� WF15 RNNExED INTO THE CITY QY Tw= K 2 qNl lExA7701 1 IN 1997 1 497 I I LIMIT DETAILED STT UDY 1 ZONEAE 4s47 ast Island Divide \ ZONEAE motITT 1JG EFFECTS FROM •O Unnamed Roed 499 ZONE A4d ZONE FLOODING EFFECTS FROM BOXELDER CREEK OVERFLOW BURL/NGTON NORTHERN XA N O GP � City of Fort Collins vP AREA NOT INCLUDED LIMIT DETAILED STUDY ,,,, C! ----- ZONE A7 h. V) (EL 4954) y tLl z ZONE AO (DEPTH 3) P ZONE A7 ZONE A7 (EL 4943)_ I 05 WELD CANA. —LOT / S 17E ZONE Lgnnler CovnIV J=1RM Map / � 08 0101 - 0/80- F ZONE A2. 1 FEDERAL EMERGENCY MANAGEMENT AGENCY NATIONAL FLOOD INSURANCE PROGRAM ' ELEVATION CERTIFICATE Important: Read the instructions on pages 1 - 7. O.i"O.B. No. 3067-0077 Expires July 31, 2002 SECTION A - PROPERTY OWNER INFORMATION For Insurance Company Use: ' BUILDING OWNER'S NAME LL Policy Number V S 150 H7 BUILDING STREET ADDRESS (Including Apt.. Unit, Suite, and/or Bldg. No.) OR P.O. ROUTE AND BOX NO. Company NAIC Number 10/Z /Vorthear F on a ' CITY STATE ZIP CODE For>- Gol/fns. f�n Qnr7.111_ 1 rr<Urtr(I Y UtSURIPTIC) (Lot and Block Numbers, Tax Parcel Number, Legal Description, etc.) Lot ! K-2 /ndustria) Park Po D BUILDING USE (e.g.. Residential, Non-residential. Addition, Accessory, etc. Use Comments section if necessary.) A10n—residerrLcr! LATITUDEILONGITUDE (OPTIONAL) HORIZONTAL DATUM: SOURCE: LJ GPS (Typd): ( ##'-#W-##•##' or ##. kk##' L NAD 1927 LJ MAD 1983 L USGS Quad Map L-.I Other. SECTION B • FLOOD INSURANCE RATE MAP (FIRM) INFORMATION ©. B1. NFIP COMMUNITY NAME 8 COMMUNITY NUMBER B2. COUNTY NAME B3. STATE FOrt Collins 080)02 Lorimer I CO B4. MAP AND PANEL B5. SUFFIX B6. FIRM INDEX B7. FIRM PANEL 88. FLOOD 89. BASE FLOOD ELEVATION(S) NUMBER DATE 3 !e 9G EFFECT E/REVISED DATE 3 /e 96 ZONES) (Zone AO, use depth of flooding) �?¢ 6 3 ' B10. Indicate the source of the Base Flood Elevation (BFE) data or base flood depth entered in B9. "FIS Profile t2AFIRM LJ Community Determined LJ Other (Describe): B11. Indicate the elevation datum used for the BFE in B9: i <NGVD 1929 JJ NAVD 1988 LJ Other (Describe): B12. Is the building located in a Coastal Barrier Resources System (CBRS) area or Otherwise Protected Area (OPA)? L _j Yes J� No Designation Date: SECTION C - BUILDING ELEVATION INFORMATION (SURVEY REQUIRED) ' C1. Building elevations are based on: LJConstruction Drawings' LjBuilding Under Construction' 12<Finished Construction 'A new Elevation Certificate will be required when construction of the building is complete. C2. Building Diagram Number / (Select the building diagram most similar to the building for which this certificate is being completed - see pages 6 and 7. If no diagram accurately represents the building, provide a sketch or photograph.) C3. Elevations — Zones Ai-A30, AE, AH, A (with BFE), VE, V1-V30, V (with BFE), AR, AR/A, AR/AE, AR/A1-A30, AR/AH, AR/AO Complete Items C3a4 below according to the building diagram specified in Item C2. State the datum used. If the datum is different from the datum used for the BFE in Section B, convert the datum to that used for the BFE. Show field measurements and datum conversion calculation. Use the space provided or the Comments area of Section D or Section G. as appropriate, to document the datum conversion. Datum Conversion/Comments ' Elevation reference mark used for}CsOfn1 4- - 96 Does the elevation reference mark used appear on the FIRM? JJ Yes KJ No ❑ a) Top of bottom floor (ncluding basement or enclosure) 4-9 C 9 �0 ft.(m) ❑ b) Top of next higher floor _ ft (m) a `�INsirrl/a�,� ❑ c) Bottom of lowest horizontal structural member (V zones only) _ ft•(r1) 02 �'%` R t ttt7gj�6�,� ' ❑ d) Attached garage (top of slab) w a ?�.jG�9T EREO�Jt��J.sy'r^ ❑ e) Lowest elevation of machinery and/or equipment servicing the building ¢ 9 C 9 R(m) E - 0 *e ' ❑ f) Lowest adjacent grade (LAG) 4- 9 G 9 ZO ft. (m) z' ' a ❑ g) Highest adjacent grade (HAG) 9 G 9 j� ft.(m) 2 S f 30J00 Cl h) No. of permanent openings (flood vents) within 1 ft. above adjacent grade 5 p. ° F V. ❑ i) Total area of all permanent openings (flood vents) in C3h sq. in. (sq. cm) SECTION D - SURVEYOR, ENGINEER, OR ARCHITECT CERTIFICATION 111� c:ci ulluauon is to De signea and sealed by a land surveyor, engineer, or architect authorized by law to certify elevation information. 'I certify that the information in Secdons A, B, and C on this cergrrcate represents my best efforts to interpret the data available. I understand that any false statement may be punishable by fine orimprisonment under 18 U.S. Code Section 1001 CERTIFIE S NAME LICENSE NUMBER TITLE V. 1. Rnhins n co/Orado PE ¢ LS # g-50Z ✓. P �1 COMP Y E ADDRESS ` / e1 �a Aft/Jr i � 4-'o -A 1 1 -1 QITY STCTC To I'll /,1 rJ • O G O D Z SIGNATUR/� DATE, 9 T LONE 70EPH¢6 9331 MA Form 81 31, AU 99 SEE REVERSE SIDE FOR CONTINUATION REPLACES ALL PREVIOUS EDITION 'PORTANT: In these spaces, copy the corresponding information from Section A. For Insurance Company Use: JILDING STREET A RESS (Including Apt., Unit, Suite, and/or Bldg. No.) OR P.O. ROUTE AND BOX NO. Polio Number QZ o QS no _Y STATE ZIP CODE Company NAIC Number Co "n s GU 0 SECTION D - SURVEYOR, ENGINEER, OR ARCHITECT CERTIFICATION (CONTINUED) opy both sides of this Elevation Certificate for (1) community official, (2) insurance agent/company, and (3) building owner. DMMENTS I —I Check here if attachments ' SECTION E - BUILDING ELEVATION INFORMATION (SURVEY NOT REQUIRED) FOR ZONE AO and ZONE A (WITHOUT BFE) r Zone AO and Zone A (without BFE), complete Items E1 through E3. If the Elevation Certificate is intended for use as supporting brmation for a LOMA or LOMR-F, Section C must be completed. , Building Diagram Number (Select the building diagram most similar to the building for which this certificate is being completed — see pages 6 and 7. If no diagram accurately represents the building, provide a sketch or photograph.) ?. The top of the bottom floor (including basement or enclosure) of the building is LLJ ft.(m) I I lin.(cm) Lj above or U below (check one) the highest adjacent grade. i. For Zone AO only: If no flood depth number is available, is the top of the bottom floor elevated in accordance with the community's floodplain management ordinance? 1 1 Yes 1 I No 1 Unknown. The local official must certify this information in Section G , SECTION F - PROPERTY OWNER (OR OWNER'S REPRESENTATIVE) CERTIFICATION he property owner or owner's authorized representative who completes Sections A, B, and E for Zone A (without a FEMA-issued or ommunity-issued BFE) or Zone AO must sign here. ' ROPERTY OWNER'S OR OWNER'S AUTHORIZED REPRESENTATIVE'S NAME DDRESS CITY STATE ZIP CODE IGNPTURE DATE TELEPHONE ' OMMENTS L� Check here if attachments SECTION G - COMMUNITY INFORMATION (OPTIONAL) e local official who is authorized by law or ordinance to administer the community's floodplain management ordinance can complete , actions A, B, C (or E), and G of this Elevation Certificate. Complete the applicable item(s) and sign below. '. LI The information in Section C was taken from other documentation that has been signed and embossed by a licensed surveyor, , engineer, or architect who is authorized by state or local law to certify elevation information. (Indicate the source and date of the elevation data in the Comments area below.) L( A community official completed Section E for a building located in Zone A (without a FEMA-issued or community -issued BFE) or Zone AO. i. LI The following information (Items G4-G9) is provided for community floodplain management purposes. I I ISSUED I ' This permit has been Issued for. L) New Construction LI Substantial Improvement 1. Elevation of as -built lowest floor (including basement) of the building is: _ fL(m) Datum: ). BFE or (in Zone AO) depth of flooding at the building site is: _ ft.(m) Datum: ' DCAL OFFICIAL'S NAME TITLE OMMUNITY NAME TELEPHONE IGNATURE DATE OMMENTS —I Check here if attachments MA Form 01-31, AUG 99 REPLACES ALL PREVIOUS EDITIONS , LEGEND Property line ----------- maemmt line roaci right-of-way a section comer tie �I —A—F— fence NM Q I� existing contour ustin9 wofMine V' ti — —� e0is619 Peerhood power line ervaWg stomr enin pipe it§ existing concrete e prop" comer, SCALE - 1 "-JO' a gas meter Q 3 I d6 JULY 25. 2001 a sNctnc meter is 2 p l JO 0 Ja tw wHHHHHH 0 power pde ti I O n I CwAPinC SGItE - f££I ® wren meter Z I i O we post Ni ,ow existing spot shrwtim street light I � ` or4tirg hee I I I r l fi �f SB9°J9'00"E 375.00' e ' \\ nfe•mr-eeeAr4 �! ._______ � ter sama cola rr� wntir!WZ wane O �— -�__ T I 19 arecmw --r— 1 _ IN _ M'dwi IMI NIbT�i ICC l.. r __`fie.. it ]I ^ O /I�R llvali nyonla 9a0q I1f -- �I (i }I O " - - I o O a IFI ' O i i tre nnr __ ____ O- I I �.;�ifIxx Man }I I T g (D I� m q{ 1 •WwV __ - IV ------------ --- w.n men nlmr ___ __ _______ ____________---------------------- JO' pudic aoaee msimenf N89039'00"W 375.00' (f1E�0i I JPGPNt �� l As..ex.ew co, as te,s-,-ee Z O O F to _ _ Cwf MUlxry SYnff 5(uM NpMey M. 11 � rr � � � Z 0 VICINITY MAP SCALE - r'=2000' 0 r; 0 w o a a s BENCHMARK: City Of Fort Collins Benchmark No. 4-98 on the South end o/ n o ; West abutment wall at 1-25 and Vine Dnve. / /'� °i yy� ELEVA77ON . 4984.09 w a "" s i Q O 3 U a o O o 0 ' Q w N W 2 J z o z � o ] In V i z M $ o �W N� CI • 2 Oil: n m o� V � k 4 s 2 4 8 0 2 4 W E N P ti u� J Y i ry ry O WI)I 9 MASER 2 or 2 d LEGEND ' 1 pop My line I ---'---- waemenf tine 1----'—"— moo right-ofwoy NOTES: a'r-------- ascron comer tie 1, me top o/ rourMorm w ebnona shown 1 --Q am the minimum Newtions required for �.. protection fence lines protection frown the rIXl-boor storm. Minimumail rn«ahed host Bets, thanons aboea, the , tejer ase. or i wr/aroo streets, chor,nas ustditcrea woroaa, existing contour matt r grsoe Ionnfiar t as shown. master 9rodnnq polo ore to Oe vhown. existing waterline I 1. Nl lives shown qrc existing. I — —p_ — existing owrpead power line y _ —0— — exnFrq storm emirs ape d?i exroisting nefe Ia1 O property comer e gm meter 1 JULY 25, 2001 0 eleotrc meter m power polo t ® water meter !� 1 I I i GRAalllt .q(_VF - fFEI ❑ gate port I e existing spot elemhon avert light ; +° ..,, ♦ n• R° —� aanoce flow arrowsti' I i v :eb" ,ao 1 I II �:CI 9 a.lea..l i A SB9 J9 DOE J75 00 s • a 0' ee of E 1 ___ ________ __ ____ __ ____ _--------------- 0 181 rro-Mai . nr e•cmlraua •,r-. f i _.F 1 rr xer r. awtes awl �� ra u�..rn,r_-at OW { ° nrr a.y-acxu(�\� /EM s•mta /[lc[ _____ r r QWitless two aflbga 402j I y 1 28'i H«Lon IGo f� 11 F�1s-• w OIa n.— eq� r9 b { ti •� N� ) /w'•nr 111D1E: IT MYe z a ille enL'rs safNinq ? I • I O 'a • .(O •' a aM W I Ito dMeob b Waist $l ib ZO S �I sans O r �_ �; 1 01 /// 9 i 71\ ootc axsr v .o• _ / ds''' rp I s i w two MIN e. _ a O 510,31P Al ltl' P tlg`I �'' sue" F •� �e .s� . . mot Xww `n Know- w•F`°rowv.r:eu «aY N A ••_ f�n.0 I b 9^ 1__ __.. �0. b9� r T Sys I = i &EE IA® _. _. red° NBB•J700W 375.00 ` «b �^--- __-- .. ...... .......... �l I « ( i'IICI I I &EE.� NeVJ I I �e j I .� j 1 OIFlE Ifl) 1 BII I p I LJ®n I r saeeerr a,mr, of S bo 3-7-M STANDARD EROSION CONTROL CONSTRUCTION PLAN NOTES a��.mar w +sews ownee.e fe=as ar,r r.ww.e raloa b ra ewe are•ra ru v a..bas. aaaM. r=av snA�.w «awae.w re✓ «hell m r x.mre a rr u.,. e w .aa„.w. rwwr WUM1mvw Tr•rb' as r raaw w.+..w.nw—xru. aene.a r wbNvae a ✓W4 ^pavrb. .vrrmeab rwrrw:.m.6:w mwrwtM ✓'mr+ia me a-aw ael°•r pupa ewkla Mm. re xse a.4«ar re vrrwv mve(atrs a.six aab t fto w. mono 0, acl arcsr .men a reMw. ns w m e eery e 0 wars rwrr...nx r...an ^t-uaud w enw mv+n mo ft M w sm wertv vewa a.re Mu-ar-as aw....w °wr+N ve a00 ro u.n uT (wl emv Mus rx.�a rwrcu>r vr..w.. amnw F.e. %mrw. 1 u +«rw. -w ae..rr . e.r'�0�me•m•r.w.e.v.as.a.r.ur rwis e+�+v m.e..a.. araa�.mnw°++r ..w-.:r•w .. a.r.....a ane�vu. i+w�e�r�^wirvw a.. npx.. a,x e�wrr. w�awr awrrrr.+ . r.«--, rain r� •».ra ......�.«. .°e..aro.e> �...�a,..«....�,r Z O g we<.r.. w. �M rim �.nw^...�e•ro<wr .,,.r°„�r.. r.,., .a.... nrwre U �cp a,na... wasw n w,wv. aw.o-v a e.oe.r .uw wro cp ar..e b> robrp � N w.a wr.. M.W.eMr epra narrrb our 3 M rn4sY Z O V K O � O K a n r v • m 0 cn Qvz 3 ,,7� 0 2 co o 0 � c5 Q � � W 0' U � � gg o p g8 � F s s apn V e tl ' City of Fort Collins, Colorado O UTJLIIY PLAN APPROVAL o MPROYED: City r.ee;«.. Who CHECKED BY.: E wea, a waa.obr uwrr am CHECKED BY.' sa,mnw r uses am roe leamr arz CHECKED BY ra/w/or rsa s xaprnn am CHECKED BY.. es`w norrw Moermo, wra s¢a learax CHECKED BY: Z or .3 a,r.