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HomeMy WebLinkAboutSupporting Documentation - Drainage - 09/18/2025 COLORADO CIVIL GROUP, INC. • 2204 Hoffman Drive • Loveland, CO 80538 • 970-278-0029 September 18, 2025 Wes Lamarque Fort Collins Water Utilities Engineering 281 North College Avenue Fort Colins, CO 80524 RE: Axis International Academy Site Improvements and Drainage Modifications Mr. Lamarque, We are pleased to submit this preliminary drainage evaluation for the planned improvements at Axis International Academy (AIA), located at 3939 Automation Way, (Lot 1 of the Collindale Business Park and is in the Northeast Quarter of Section 31, Township 7 North, Range 68 West of the 6th Principal Meridian, City of Fort Collins, County of Larimer, Colorado) which is approximately 6.38 acres. A vicinity map is presented in Figure 1 below. Figure 1: Vicinity Map COLORADO CIVIL GROUP, INC. • 2204 Hoffman Drive • Loveland, CO 80538 • 970-278-0029 Project Summary The site is part of the Fox Meadows Drainage Basin. The AIA site consists of an existing building, existing parking lot, landscape amenities and an existing swale that wraps around the northern property line and parts of the eastern and western property lines. It should be noted that all site runoff is conveyed to an existing drainage swale located in the northeast corner of the site. This existing drainage swale is well vegetated and appears to be an effective permanent water quality BMP. This project intends to keep this existing feature in place to meet LID requirements. There are no on-site below grade conveyance stormwater systems, other than the 30-inch RCP outlet pipe from the existing swale. The proposed improvements include remodeling the existing building for the PK -8 school, additional concrete walkways, new playgrounds and a new parking lot. Previous Studies There is an approved Storm Drainage Report, completed on March 14, 1989, for the entire Collindale Business Park, prepared by Stewart and Associates, Inc. The report discusses a Regional Detention Pond for Lots 1, 4, 6, 7, 8, 9 and 10 of the development. The AIA site is Lot 1. The original calculations for Lot 1 estimate a developed runoff coefficient of 0.85, utilizes the coefficient factor of 1.25 for 100-year storms and has a total site 100-year runoff of 44.8 cfs. The approved drainage report states a 27-inch RCP culvert was to be installed to carry the sites flow beneath Automation Way to the Reginal Detention Pond on the east side of Automation Way. The site’s release rate was based on the 10-year rate of 21.9 cfs. Figure 2: Detention Pond Location COLORADO CIVIL GROUP, INC. • 2204 Hoffman Drive • Loveland, CO 80538 • 970-278-0029 Drainage Evaluation Summary To determine if additional stormwater detention would be required for the project (beyond what is provided for within the existing Regional Detention Pond), the site’s proposed hydrology was evaluated. Basin Evaluations Fort Collins Stormwater Criteria Manual (FCSCM) provides runoff coefficients based on proposed land use surface types. These were utilized to determine the composite runoff coefficients of each basin. Values from this table are presented in Table 1. Table 1: Surface Type Runoff Coefficients The composite runoff coefficients were adjusted by applying frequency adjustment factors (C f) for the appropriate design storm event. Composite coefficients Frequency Adjust ment Factors found in Table 3.2-3 of the FCSCM utilized are presented in Table 2 below. Hardscape or Hard Surface Asphalt, Concrete 0.95 Rooftop 0.95 Recycled Asphalt 0.80 Gravel 0.50 Pavers 0.50 Landscape or Pervious Surface Lawns, Sandy Soil, Flat Slope <2%0.10 Lawns, Sandy Soil, Avg Slope 2%-7%0.15 Lawns, Sandy Soil, Steep Slope >7%0.20 Lawns, Clayey Soil, Flat Slope <2%0.20 Lawns, Clayey Soil, Avg Slope 2%-7%0.25 Lawns, Clayey Soil, Steep Slope >7%0.35 Surface Type Runoff Coefficient (Cx) COLORADO CIVIL GROUP, INC. • 2204 Hoffman Drive • Loveland, CO 80538 • 970-278-0029 Table 2: Frequency Adjustment Factors The proposed basin hydrology summary is presented in Table 3 below. Table 3: Proposed Condition Basin Summary Regional Detention Pond Evaluation The site’s composite runoff coefficient and total developed flow, including all new AIA improvements, are both less than what the approved Reginal Detention Pond was designed for from Lot 1. Since both values are less than what was approved, no additional on site detention will be required with the proposed improvements. See Table 4 below for the comparison summary. Table 4: Proposed Condition Basin Summary 2, 5, 10 1.00 25 1.10 50 1.20 100 1.25 Storm Return Period (years)Frequency Adjustment Factor (Cf) 100-Year 2-Year 100-Year I100 Q2 Q100 (acres)(minutes)(in./hour)(in./hour)(ft3/s)(ft3/s) A 0.99 11.8 0.35 0.44 2.1 7.4 0.74 3.22 B 2.77 11.1 0.55 0.69 2.1 7.4 3.26 14.21 C 2.62 11.9 0.69 0.87 2.1 7.4 3.87 16.85 TOTAL 6.38 0.58 0.72 7.87 34.28 2-Year C2 100-Year C100 2-Year I2 Basin I.D. Basin Area Time of Concentration RunoffRunoff Coefficients Rainfall Intensity Approved*0.85 44.8 Proposed 0.72 34.28 * -Storm Drainage Report Collindale Business Park, March 14, 1989, prepared by Stewart & Associates, Inc. Condition 100-year Runoff Coefficient 100-Year Q100 (ft3/s) COLORADO CIVIL GROUP, INC. • 2204 Hoffman Drive • Loveland, CO 80538 • 970-278-0029 Water Quality Capture Volume & LIDS Treatment The primary goal of the water quality components within detention ponds is to remove pollutants from stormwater runoff before entering natural waterways. We are proposing to utilize the existing natural vegetation swale prior to the outlet culvert beneath Automation Way, as water quality control for the site. This swale is heavily vegetated, serves as a natural feature to help settle out the undesired pollutants and is established in nature. The proposed improvements aim to keep the existing swale as is and avoid any disturbance within it. See images below of the existing swale and current vegetation. Image 1: Outlet Culvert Area Image 2: Vegetation along east property line COLORADO CIVIL GROUP, INC. • 2204 Hoffman Drive • Loveland, CO 80538 • 970-278-0029 Image 3: Vegetation along north property line/established tree Image 4: Vegetation along north property line COLORADO CIVIL GROUP, INC. • 2204 Hoffman Drive • Loveland, CO 80538 • 970-278-0029 Enhanced water quality treatment systems for stormwater have been required within Fort Collins since 2013. The City of Fort Collins LID ordinance requires that 75% of all newly added or modified impervious areas be treated by LID techniques . The new impervious area is primarily associated with the new parking lot. We would request that the existing vegetation within the swale serve as the LID requirement for this project. The runoff from all new improvements are conveyed to the existing swale, therefore 100% of the new impervious area is being treated through a LID technique. Figure 2, below, shows the extent of natural growth within the swale. Figure 2: Site Map COLORADO CIVIL GROUP, INC. • 2204 Hoffman Drive • Loveland, CO 80538 • 970-278-0029 Conclusion Although the proposed site modifications discussed in this memo do increase the overall site imperiousness from today’s current condition, the increased amount remains lower than what was approved with the design of the Regional Detention Pond. As such, the existing storm system appears to have the capacity to effectively convey the runoff from the new site improvements to the existing Reginal Detention Pond. The proposed modifications are in compliance with the existing system constraints. If you have any questions regarding the planned site improvements and drainage modifications, please let me know. Sincerely, Lindsey Green, P.E. Colorado Civil Group, Inc. 970.278.0029 lgreen@ccginc.us COLORADO CIVIL GROUP, INC. • 2204 Hoffman Drive • Loveland, CO 80538 • 970-278-0029 Supplemental Information COLORADO CIVIL GROUP, INC. · 2204 Hoffman Drive · Loveland, CO 80538 · 970-278-0029 Previous Studies STORM DRAINAGE REPORT COLLINDALE BUSINESS PARK MARCH 14, 1989 PREPARED FOR K. BILL TILEY STEWART & ASSOCIATES, INC. L 214 NORTH HOWES FORT COLLINS, CO 80521 STORM DRAINAGE REPORT• COLLINDALE BUSINESS PARk• Collindale Business Park is within the Fox Meadow Drainage Basin. The property is located on the west side of Timberline Road and extends west to the Union Pacific Railroad. The property begins 1330 feet south of Horsetooth Road and runs south approximately 1700 feet to the top of a ridge. The Tiley property covers only the north 1330 feet, and the property to the south belongs to Tom Chandler and Don Chadwick. The gross area of the property, including the Chandler and Chadwick properties, the west z of Timberline Road, and the East z of the Union Pacific Railroad R.O.W. is 44.5 acres. There is no offsite run—off onto the site. The south boundary is a ridge from which the drainage goes southerly to the Chandler sump. Flows from the west are blocked by the Railroad embankment. The north boundary is the low point and drainage flows east along this north line. There is an irrigation ditch running east parallel to and about six feet north of the north line. This ditch belongs to Bob Shields. The ditch can.carry irrigation water from Warren Lake across the golf course, under the railroad and along the north property line. Historically, this ditch has carried storm drainage under the railroad from the golf course and from .the railroad right—of—way. This flow from the golf course, according to the Fox Meadows report is Q2=1.0 c.f.s. — Q10=3.0 c.f.s. — Q100=9.0 c.f.s. per page 12 of the report. We propose to not distrub this ditch or alter the flows which it now receives. The attached map shows the entire 44.5 acres divided into 10 sub —basins and a detention pond area, which are shown as parcels 1 through 10 on the map. We propose to provide detention for parcels 1,4,6,7,8,9,10 and the pond area. The total area being detained in the pond will be 44.5 acres minus 5.7 acres in Parcel 2, minus 1.3 acres in Parcel 3, and minus 3.1 acres in Parcel 5, which equals 34.4 acres. Detention shall be provided on site on parcels 2 and 3 for the difference between 2 year undeveloped run—off and 100 year developed run—off. -Parcel 5, the'Chadwick property, has a 10 year undeveloped run—off of 1.4 c.f.s. which will be carried through the proposed drainage system to the detention pond, area. Future detention must be provided on Parcel 5 when and if its present use is changed. The undeveloped 10 year out —flow from Parcels 2 and 3 was used to determine gutter flows because it is greater than the future allowable out —flow when the Parcels are developed and on —site detention is provided. These out —flows are shown on sheet 14 of this report. The proposed detention pond is located at the northeast corner of the site. The outfall from the pond will drain under Timberline Road to the east and then into the Sunstone swale. The new pipe under Timberline Road is per the design plans of the Fox Meadows Business Park Drainage Channel. We plan to carry the storm runoff by overland flows to the detention pond. The majority of the flow will be carried to the pond by a drainage swale which runs to the north along the west side of Timberline Road. Storm Drainage Report Collindale Business Park March 14, 1989 Page 2 The Collindale Business Park will be developed in phases. The first phase will be the streets, Parcel 1, the drain swale along Timberline Road, and the detention pond. The detention pond area will be used as a settling basin for erosion control during the first phase construction period. No outlet shall be connected to the Sunstone Swale before the streets and grading on Parcel 1 are completed. At the time of connection, erosion control may be needed to protect the outfall from sedimentation. A concrete pan is to be placed in the drain swales to prevent erosion. Flow capacities of these pans are calculated on sheet 13 of this report. The attached calculation sheets show the run—off calculations from each of the parcels, the allowable gutter flows, the allowable outflow from the detention ponds, the required detention, and the volume of the pond. Also, there are run—off computation sheets showing flows at design points. These design points are shown on the attached map. Out —flow from the detention pond will cross under Timberline Road in a 24 inch pipe which empties into the Sunstone swale. This 24 inch pipe will also carry out —flow from the W.W. Reynolds property located directly north of the Collindale Business Park. The W.W. Reynolds out —flow is approximately 5 c.f.s. There will not be a property owners association for this development, therefore we propose that the .City of Fort Collins maintain the detention area and channels. A 2 year or 2 growing season time period is required, plus, acceptance by Stormwater Utility, prior to assuming maintenance. Should the adjacent property owners desire to place more intense landscaping in the detention area and channel than that required by the City, they shall become responsible for placing and maintaining this additional landscaping. All landscaping in the detention area and channels shall be subject to approval by the Stormwater Utility, City of Fort Collins. Office of STEWART & ASSOCIATES, INC. o(f•.+...,,. 3/S1dr9 Phillip I. Robinson, P.E. & L.S. G\ST Ei?F;iji 4502 2 COMP,UTATIOW> ., James KIStewart & Assoc. j Fort Collins, Colorado t I I By: PIF Date 116 8 Client: f ill' 7— ey Sheet No. 3 of f 4- Chkd By: ' Date Project: ( 0&1701a4e 3051'nes5 Bark Job No. Subject 'S Orrg rair'laae Calc(Aot4-ior)J f offal Gr-w /4ra.a. = ¢4-. S acres inel• ;/Z JZ/ro%z%i Serlier4 chadwic c) 14i,s4ciric G= 0.20 — -57 = O:SB e7 Cl.-.zoo eoO I ^ t QZ - G)lor 0 20)0.6)¢¢.5) z 7. I Z cts ALLoV,l/t4-13LC- oUTr-14LL Ir) Per acre 7,1Z 44+.5 = 0.J6 cfs J ac. Deve1a CGh i 7 1 0' S. Fi-UwI zonins SlvPe off- Stree{ -use o.¢ r e fa e la-S i i i i l o%vMe 0 PO cz e En Jon I E )e ai-1 o i O 4-Z I 500 3 `/ Oo 0 l0Z000 l 26 OA q q vo0 reOirec/ I Z.3/3Z00 i i j, Uglv.e i 300 z1750 z 70t06 Tor^+- UolvMe 130(I Z30 0 w 7 s'-o J 37 500 345050 i r COMPUTATION James WStewart & Assoc. ' Fort Collins, Colorado i By: P1IS Date Client: k% !3i i % lIey Sheet No.4—of Chkd By: Date Project: Co%l g P 6vs Pu F'a f Job No. cL ir- i Subject et i l/1 ci inar! e cct cc'l k:2kI5 7-0fa1 Deb en lo J Vl eC — /rea To kl —(Are4, oP Por-eels z, 3 s) M.zs DIArrrz.rl NMET+tG _ 44.5-- l0,1 = .3¢,4- acres T 10 zo 30 U FG 90 1Z0 too 300000 zorXioo 100000 z 7.3 15-06 7? S.z 34.¢ z 4-C,SC S I ZSC9 G8 3.5 ; 268R66 z. G I.Bs 1.05 33 35-y13 3100q CbM . PUTATIONO STEWARI -Z, OCIATES Consultirrg Eq3ineers and Surveyors 214 N. Howes St. Ft. Collins, CO 80521 (303) 482-9331 By: PI R Date Client: 13ill T IPY Sheet No. -5 of Chkd By: Date- Project: CO CIO Ie 3 V5 i h ely Subject -S-h rpn D 0'-\ 1?e e / v n 7arc If 2, 3 #!;' I t57 5" 45 14W-011" D, ei r,No V1 0- 0. p tiv lij b RO T II, 0-0 0 I F k-J G( I'(" I3 h: 1 ! ) Cre i I ' s lee r-k 5 O e I 0()Wow L7e4 V, die 9 TL 37 nt/ 3.7 a. zz 1 SFr- , PAR CE[ r 0/4 U 11-5k 1 bee- 13 7 I f V r 5- e I L/O lv 01) f 3 01 e p' r'' I ti Ic u p m^ r y v• EO cr I v m jU yov^ lcvti L 1L11 U L 30.vdj troy w CL o V M tuL O Q poi O O M+ t pv Mt Mt ul fli col c M O V M ri rJ t nl N r-1 M N N ti N i rM t} i- j w N M r,\ j C) rJ- M u u u N VJ a b r M N V s M N1 r' 0 4- v Upc 0 r rl ? o a 41 w O W E a C cam;. y J n L o, mom} C r r rO ON 1 r. E r O N 1s W Q u l9 1n w V u O r j p 00 a. Cy'• g M , N a L ll L o`er o r1i o ti N C I u a 4 C U CI JW > p O L v O l L i"1 + M } T } o- n VZ gz o d j r d- M M u r1i w 9 a d M Op. CO e lr V u co o o p00oO n lr a Lr a o- e r o N o a rw;o C r w 0 W u a N i JW p v V C 60, a Mz r• ^' M M dJth + M t i- + Q M i l7 r, 1 w w M 2 p Na J a4.- Qi Mh r v- o O 1 1 V` M •' CA CI a' 1 COMPUTATION* STEWARTIL' Sr )CIATES Consultin3Engineersanu Surveyors . - 214 N. Howes St. Ft. Collins, CO 80521 . (303) 482-9331 By: EJ R Date Z Client:' 30) Ti f e y Sheet No. of Chkd By: Date Project: L0 CJ a I d 13vs (n of 5 Vo rk- Subject f_o rrT7 17 rcrin itv — GO Her C? C- Ir7ijiQ I Lo p I. crass s I e.=i_:- L j _..I- X IZ. i !? r QZj I; calv.l,. I. I I_ Q.4.Z; I I I! iz Jr- 7 Q. k z ro GZ Olt l 0 y le el%i 4f pk I0L090! sI 5- 7 0 7ZS: 17 to. IJI 0 it 0_3 0. 010J 71 z Golre. c._ it aI I j I j A/ J1 41. V 1'ef W el r C- 4 I e r J C_ 1-Cr e R; i L e 7.. 0 f i- (_ VJ r 0 A Z_­ ­ COMPUTATIONS STEWART""t Sf CIATES tCorisultingb-xgineersano Surveyors 214 N. Howes St. Ft. Collins, CO 80521 (303) 482-9331 By: Date.. Z 17),rr7 Client: LC 13M TiIeZ Sheet No. I Of Chkd By: —Date— Project: COffi f) Jcz le. T3 . us n '05 - Jr PO4 / Subject Storms VrOl in Q e ir ee-L Cct cxcit:g L (C L 1. U IL on ri at- C. at I j Jz_ 2 LLL d,o Leo. S I _ zS I j i I i JI. F 3 T Aaw d'' 4- 0 1.6 C7. 7 I el 3. Al CIATESCOMPUTATIONESTEWART S. CorisultiMEnSineersanu Surveyors 214 N. Howes St. Ft. Collins, CO 80521 (303) 482-9331 By: Date 2 z a Client: d I IIP.y Sheet No. I I of A— Chkd By: Date— Project: '('—`olb'o-,ccn-le Cusfe)e-ri -PC, Subject n lej,S ol el <4 z2i12e5 L V r 93 -57- II 5r R) S jii gel F-7 T S L/ ":;P 511 jT' I li i i I Il COMPUTATION'.. STEWART \.Ir OCIATES C"isulting ErvZineers and Surveyors 214 N. Howes St. Ft. Collins, C080521 (303)482-9331 By: PIK Date Client: Lr- 13 ill 71) e e-. Sheet No. l3 of Chkd By: Date Project: 13v5illesf Pork Subject -O-Orwn 2rcalnc(e- efe) c r—I ow I n --57oun-s tArov 6 Sw'gle-s f a" I, ic f 4-11 z 0' 67 ic/ V el z ur 0 ire A4 Oiz- Pa 77 a oi AA STORMWATER REVIEW COPY Final A rovE Report 8 Z40 3 Date ADDENDUM TO STORM DRAINAGE REPORT FOR COLLINDALE BUSINESS PARK FOR THE AMENDED OVERALL DEVELOPMENT OF COLLINDALE BUSINESS PARK PREPARED FOR THOMAS CHANDLER PREPARED BY STEWART AND ASSOCIATES, INC. 103 SOUTH MELDRUM STREET FORT COLLINS, COLORADO 80521 303/482-9331 AUGUST 6, 1993 ADDENDUM TO STORM DRAINAGE REPORT FOR COLLINDALE BUSINESS PARK FOR THE AMENDED OVERALL DEVELOPMENT OF COLLINDALE BUSINESS PARK SITE DESCRIPTION The Amended Overall_ Development Plan for Collindale Business Park includes all land in the SET of the NE; and in the -NET of the SET of Section 31, Township 7 North, Range 69 West of the Sixth P.M., City of Fort Collins, County of Larimer, State of Colorado, which lies -east of the Union Pacific Railroad and north of the City of Fort Collins property known as Timberline Wetlands. Included in the total site is that part of the Timberline Storage P.U.D. and that part of the undeveloped Chandler property which drains south to the Timberline Wetlands, as well as all lands of Chandler, Chadwick and the previously developed Collindale Business Park area which flows northeast to the existing detention pond at the northeast corner of the Collindale Business Park. PROPOSED DRAINAGE We have included with this report a plan of the Collindale Business Park area. This map was a part of the 1989 Collindale Business Park Drainage Report,and all of the parcels draining northeast to the detention pond were shown. The enclosed map is updated to include the Timberline Storage P.U.D. and also the undeveloped Chandler property which drains south to the Timberline Wetlands. The Timberline Storage P.U.D. drainage report prepared in April 1993 by Stewart & Associates, Inc -..shows that a north sub —basin of 0.75 acres will drain to the north through a detention pond with a release rate of 0.32 c.f.s. into Automation Way. This onsite detention quantity and flow release rate into Automation Way substant.ially complies with the requirements of the 1989 Collindale Business Park Drainage Report. The south sub —basin of 3.63 acres will drain undetained into the Timberline Wetlands, with the appropriate erosion control procedures being utilitized. There are no development plans at this time for the remainder of the Chandler property which will drain south into the Timberline Wetlands. At the time that development is proposed for this remaining land, a detailed drainage plan and report_ shall be prepared, and onsite detention shall be required if the developed imperviousness is greater than that provided for in the Fox Meadows Master Plan. All that part of the Amended Business Park which drains to the patterns and quantities shown in therefore, further development in and with the City of Fort Collins Control. Phillip Robinson, P.E. & L.S. Overall Development Plan of north will remain unchanged the 1989 Collindale Business that part shall comply with Criteria for Storm Drainage 11111911111ese'0Br, the Collindale from the drainage Park Report; the 1989 report and Erosion 1I w`15. _. Gr. Y Y a NttF.,n•ee AFG."vlSCsivfmi,A.i a v \\ l AMENDED OVERALL DEVELOPMENT PLAN OF COL L /NDAL E BUSINESS PARK RLP Zone MEADOWS ;SUBDIVISIONII 1962 I 0 SO DO I too 400 1 1 i __ ---- -- -- RAIL ROAD ;---`--- IOFT--= DF= WAY_ RLP Zone E ;'GOLF COURSE PHASE SIX ' PHASE THREE PH 4SE FbUR 3 1 4.5 acres gross___ 4.4 acres net y 5.4 acres gross, i 4.9 acres net / 11 68 acres gross f` 6.4 acres net 1 i 2 I Et/Hhg MawNswHp gdAllp I am AUTOMAT/O jt SEVENPHASE 3.5 q 33 ncres n es Zz P/HA4. SE . TWO 6 acres gross 5..5 acres net g; ----------____-- re t Ione lPZoe PHASE F1VE I W 4Z 6.5acresgross4.9 net a b 1 / i acres DETENTION POND; y r HT P/- fAS a I SHARED DETENYIDN 4.4 acres gross I C/ aa M'' 1HAS,Er E/ BONE4.4 acresross3.6 acres net a 9.7 acres gross 3.5 acres net 8.2 acres net / SOO.01'33' W --' Soo 11.1;;;z, fx2c ' ti .l1T- red IN cwwr N $NJ/m J/-r-sfv=—= -- LEGAL DESCRIPTION A tract of land sown in the East { of Section 31. Township 7 North. Range 68 West of the Sloth P.M., City of Fort Collins. Cwnty of Larlrr. Slate of Colorado. which. considering the Ent lim of the Northeast { of said Section 31 as baring S 00' 05' 00" E and with all bearings contained herein relative thereto, is contained within tad boundary lines which begin at the East i Comer Of sold Section I. and run thence along the East Jim of the Southeast { of, said Section 31, S 00' 01' 33" W 871.62 foot; thanca N 69' 58' 27' W 30.00 fast; thence N 71' oil 48- W 291.97 feet; than.. N 63' 52' 18' W 279.45 hotl thence N 76' 54' 16" W 187.11 f..q thence N 81. 49' 26" W 316.81 het W the East right-of- way llln of the Union Pacific Railroad; thence along sold right. of+ry line, ROD' 00' /3" E 1.011.25 feott than.. S B9' 56' 27" E 1058.38 het to •paint on the East line of the Northeast S of said Section 311 than.. along sold Ent Ilne. 5 No 05' 00" E 1330.19 het to the point of beginning. containing 49.6202 acres, sore or less, and being wb2set to all easmants and rights-of- eaY now In place or of record. RL P Zone 3I PIANIIIIR AYO 70NIIS CERTIFICATION Apprard by Lilo Planning ad Zoning bard of the City of fort Collins. Colorado. an this _ day of 1 Secretary of Planning and Zoning Board , Q . DOERS SIGNATURE The uWar, igmd, being the lawful Doers of tbe property described on this site pLn an Aeroby certify Nat they accost the conditions and ns restrictiosat forth anaid sits plan. Signed Dot. Signed Data Signed Don Signed Dab Signed Date Signed Date I 1 1 SiTE DATA ExistingZm/ np its dead B£ AAishe" Building He/pit — 40 test 7pto/ Maximum Floor Arm — 656,504 square het ANTICIPATED LAND USES office 50 x NonufocNrinp 25 7S Wan/ lous/nf 25 % Al/ Anf/c/potod ( and Wes W1 0e owllodN for all Fdases. 0 a i n yl o 0 V Oil J ' 7 S W W Q N Q10_ YI 2 a.. 1.,. I curer ONE 0 r denier aYasae ONE 36 131 Warren Lake CC 0 LOLLL I N OIA-) L F C>, ID: P'. Scale I in feet I 1000 500 0 1200 7= Legend: drainage divides open channel with 7- direction of flow stormsewers and drains with direction of flow general direction of flow of surface drainage 17ponding areas, detention ponds, etc. A-) drainage concentration points e4% FOX MEADOWS BASIN I BASIN H IExisting Drainage Patterns Figure 2 RESOURCE CONSULTANTS, INC. - Fort Collins, Colorado I see Table 31 16 4 I 1.0 Noo•OG a1'G -/ I330.89• _ N / I / // I N µpA}Z of .TIA13E;ZLINe 5T0rZ GE F'VD // \\ NOTE , Shieins Irrieo-o^ d-c I I / __. EA=:"0.75I AG ` 0 517E DETENTI'O N = 53 .6 G . F. /i \ cprri !S S40 t+e iI `/ / `///_ RELe SE-1:N1i6-.AUTUJMf-1T/ON_..WA- Ki — 0.32 C)S / 1 tro ,,-, e/ - \—^ P-7 we p r000se`-o Cno,i• dis.vb h/ed,'dljey7; 5. i • / \ _` O.35G -^/ / /' 3 Jdc DETEWTION RE?'JI M=40,EO cf OETENnO =?7C9 c ra LLDw OLE OVT.L.ow : /• ZS c-is S. C' Od2544G75 , /nvssLm.l%c.3n <fs 11 / /C / ../ // A TOM 1 i IOty/ . DRIVE • a' q o rN AAA c '•''o : c r SZO y ali y/ // / Ac L / / ./ T :-coasT 4 cATCO rtnsla CoNSTR10o7 wr2 8 ru7vQF ^,rO:v2a1.9=f9w=SLJ.i. a'o Iu 3ATCA51A1 ' r r o I/•(j' r- Jhp E?' IST/ NG - Fcor.,IN,T V / d Lo car"'•` elb .J P ( lf. J. e. O> eD'. / / / r 2 °I ? / _ IN- -i.5. .1r .5 •IS a•e. 27.L:6 AF4LIN! JVE'(i IN+ ). O 5 oe 06 44•'E--Ge LrZ9 —'/-— / —' —^— _— ; Sm oO 46'G 29e 0_ --- — • 5 W=49'--I !01--------=r;c= =—` I# CORMER SIC T/ON3 TWA&Ep(..r of c NivT-C-li 1...I1V G.—/ / 1V /.Sn•. _\\ F_xIST 62" RCP —1I I— G--- V )_ I\\, .•-_% Loor/hre Imo\ \ )M7in,G zb ws vrTu NOTE : DETENTION S ---- /.. .-: 4 _ -<• 5.TMAcE ` o- evaed oO fsheels 15F1[ ON THIS TRAcT_ 1.F.:: -:--- ., , 0EL/ELOPMENT /5 MORE IMPEIZWOUS Tl/4N:_F0, l.MEF1DO.WS l3.951AJ_ M957ER ° 0 1eo rce ----- ---.... ._ 1 C\/ISF_D _ DR> Cf/Nf+GE nt iN .FOR 3MENDED O EtZALUDEVELOPM'ENT. PLAN coLLIND LE 6V- SI/ESS P.32} I COLORADO CIVIL GROUP, INC. · 2204 Hoffman Drive · Loveland, CO 80538 · 970-278-0029 Proposed Analysis AU T O M A T I O N W A Y AXIS INTERNATIONAL ACADEMY UN I O N P A C I F I C R A I L R O A D LOT 1 REPLAT OF LOT 3 OF THE MINOR SUBDIVISION PLAT OF COLLINDALE 3942 AUTOMATION WAY LOT 2 COLLINDALE BUSINESS PARK NINTH FILING 3930 AUTOMATION WAY LOT 1 COLLINDALE BUSINESS PARK NINTH FILING 3902 AUTOMATION WAY LOT 3 HORSETOOTH EAST BUSINESS PARK 3801 AUTOMATION WAY OWNER: SADHU DENVER, LLC LOT 5B REPLAT OF LOT, COLLINDALE BUSINESS PARK 3RD FILING 4001 AUTOMATION WAY OWNER: INNOVATION HOLDINGS LLC 2.0% 0.99 AC A 56% 2.77 AC B 73% 2.62 AC C - P L O T D A T E PR O J E C T I N F O R M A T I O N SH E E T I N F O R M A T I O N PR O J E C T P H A S E AR C H I T E C T SE A L ISSUE DATE: PROJECT #: CO N S U L T A N T T - 970.484.0117 F - 970.484.0264 315 East Mountain Ave Suite 100 Fort Collins, CO 80524-2913 © 2015 www.rbbarchitects.com ARCHITECTS REVISIONS: SI T E P L A N A D V I S O R Y RE V I E W 12 / 4 / 2 0 2 4 9 : 2 7 : 1 0 A M 2513 AX I S I N T E R N A T I O N A L AC A D E M Y 09/18/2025 39 3 9 A U T O M A T I O N W A Y FO R T C O L L I N S , C O 8 0 5 2 5 DESCRIPTION DATE 2204 HOFFMAN DRIVE LOVELAND, COLORADO 80538 (970) 278-0029 CCG COLORADO CIVIL GROUP, INC. ENGINEERING CONSULTANTS CALL THE UTILITY NOTIFICATION CENTER OF COLORADO 3 DAYS BEFORE YOU DIG 811 OR 1-800-922-1987 www.UNCC.org LANDSCAPED AREAS GRAVEL STREETS WALKS & CONCRETE ROOFS LEGEND 0 scale feet 8040 1" = 40' 1 PROPOSED SITE IMPERVIOUS EXHIBIT TABLE B-1: BASIN PARAMETERS Proposed Condition 0.95 0.95 0.80 0.50 0.50 0.10 0.15 0.20 0.20 0.25 0.35 (acres) A 0 0 0 0 0 0 0 0 0 0 43,185 0.99 B 29,944 22,797 0 1,542 0 0 0 0 0 66,483 0 2.77 C 54,376 19,881 0 5,410 0 0 0 0 0 34,449 0 2.62 TOTAL (acres) 84,320 42,678 - 6,952 - - - - - 100,932 43,185 6.38 Basin I.D. Basin Categories and Areas (SF) Asphalt, Concrete Rooftop Recycled Asphalt Gravel Pavers Lawns, Sandy, Slope <2% Lawns, Sandy, Slope 2-7% Lawns, Sandy, Slope >7% Lawns, Clayey, Slope <2% Lawns, Clayey, Slope 2-7% Lawns, Clayey, Slope >7% Hardscape or Hard Surface Landscape or Pervious Surface Basin Area TABLE B.2 - TIME OF CONCENTRATION Proposed Condition tc tc Length Slope ti ti Slope Velocity tt tt tc Check (acres) (feet) (ft/ft) (min) (min) feet (ft/ft) (feet/sec) (min) (min) (min) (min) A 0.35 0.44 0.99 30 0.18 13.6 12.0 330 0.013 Grass Swale 1.0 5.3 17.3 11.8 NO 11.8 B 0.55 0.69 2.77 35 0.02 22.3 16.7 200 0.020 Asphalt w/ Concrete Gutter 2.6 1.3 17.9 11.1 NO 11.1 C 0.69 0.87 2.62 45 0.03 16.4 9.4 350 0.008 Asphalt w/ Concrete Gutter 1.8 3.3 12.7 11.9 NO 11.9 Basin I.D. Runoff Coefficient Basin Parameters C2 Type of Land Surface Final tc tc Check C100 Area Overland Flow Concentrated Flow Length TABLE B-3: BASIN HYDROLOGY Proposed Condition 100-Year 2-Year 100-Year I100 Q2 Q100 (acres) (minutes) (in./hour) (in./hour)(ft3/s)(ft3/s) A 0.99 11.8 0.35 0.44 2.1 7.4 0.74 3.22 B 2.77 11.1 0.55 0.69 2.1 7.4 3.26 14.21 C 2.62 11.9 0.69 0.87 2.1 7.4 3.87 16.85 TOTAL 6.38 0.58 0.72 7.87 34.28 2-Year C2 100-Year C100 2-Year I2 Basin I.D.Basin Area Time of Concentration RunoffRunoff Coefficients Rainfall Intensity