HomeMy WebLinkAboutLot Certifications - 08/01/2006E.ngin.sc:s Planners Surve3ynr_�:
July 12, 2006
Project No. BERNTD-5J5H-0 1 -208
Mr. Dave Carlson
Eri it-ic-ar-ing
Loveland 970-667-6286 Toll Free 866-379-6252
Fax 970 667-6298
ww. landmarkltd.com
3521 We,r. Eisenhower 31vd. Loveland. Colorado 80537
STORMWATER
RECEIVED
JUL 1 4 2006
Cottier Construction, Inc.
P.O. Box 1051/��
Fort Collins, Colorado 80525
RE: Grading and Drainage for Lot 2 of the Park South Commercial Plaza Subdivision, 4"
Filing, a.k.a. Horsetooth Carwash, 3620 Manhattan Ave., Fort Collins, Colorado,
Permit No. 130507276.
Dear Mr. Carlson,
Surveyors from Landmark Engineering Ltd., recently performed a topographic survey of the site referenced
above. At that time, concrete curb and gutter, asphalt, sidewalks, retaining walls, storm pipes, and
detention ponds had been installed. The topographic survey determined elevations on the stormwater
pipe inverts, detention ponds, retaining walls, and other site features. Using this field survey, AutoCAD
Land Development Desktop 2006 was used to generate surfaces and calculate the stage -storage curves
for the two onsite ponds. The design detention requirements were compared to those stated in General
Note No. 2, on Sheet 5 of 8 of the Dan Bernth, Park South Commercial Plaza Subdivision, Lot 2, 4`h Filing,
Horsetooth Carwash, Fort Collins, Colorado, Job No. BERNTH- 5J5H-01-208, as prepared by Landmark
Engineering Ltd., dated November 11, 2005. The Note No. 2 reads "Grades in detention ponds facilitate
drainage plan design as shown on the original plans for Park South Commercial Plaza Subdivision, Fourth
Filing, dated April 5, 2005, Sheet 6 of 8. As graded the detention volume of 0.025 ac.ft. and WQCV
volume of 0.035 ac.ft. is exceeded at the 100 yr. HWEL of 5043.85." The net volume required is
approximately 0.060 ac.ft. These required volumes were determined in the previous drainage design and
report prepared by North Star Design, Inc., Job No. 170-04, dated April 5, 2005, Sheet 6 of 8. The
drawings by North Star Design, Inc. were reviewed and approved by the City of Fort Collins in May of
2005.
Based on the "As -Built" survey, the west pond was determined to have a volume of 0.024 ac.ft. at an
elevation of 5043.85. The east pond was determined to have a volume of 0.047 ac.ft. at an elevation of
5043.85. In addition, the three 18-inch storm drain pipes connecting the two ponds would be totally
submerged at this elevation and would therefore provide an additional 0.003 ac.ft. of detention storage.
Therefore, the total ponds volume is approximately 0.074 ac.ft. which exceeds the required 0.060 ac.ft.
Qvt" , H b o
Mr. Dave Carlson
Cottier Construction, Inc.
Project No. BERNTD-5J5H-01-208
July 12, 2006
Page 2 of 2
Therefore, to the best of my knowledge, the site drainage and grading have been constructed in substantial
compliance with the Landmark Engineering Ltd. design plans and meet the above stated requirements. A
copy of the stage -storage curves for the west and east ponds are attached for your reference.
If you have any questions, please do not hesitate to contact our office.
Sincerely,
LANDMARK ENGINEERING LTD.
Rodney A. arr,E'° STOFtflNWATER
26857 _ RECEIVED
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JUL 14 2006
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LEGEND
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PROPERTY BOUNDARY
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EASING EASEMENT
EASING CURB h CUTTER
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EASING WATER LINE
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EASING SEWER LINE
EXISTING STORM PIPE
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EASING CONTOUR
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PROPOSED CURB k GUTTER
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PROPOSED CONTOUR
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PROPOSED RETAINING WALL
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PROPOSED SPOT ELEVATION
' ` __ I \\ i I 1. HANDRAILS O SICF E REWIRED ADJACENT TO ME TOP OF ALL RETAINING WALLS
E ____J 'N / L____ 1 In I ADJACENT TO SI WALKS
---I \\ f----- I TO 2 GRADES IN DETENjIW PONDS FACILITATE DRAINAGE PLAN DESIGN AS SHOWN ON ME
I.,. I I \ / I I I I ORIdNA PLANS [Oft PARK SCUM COMMERCIAL PLAZA SUBDIVIdIXJ, FOURTH RUNG,
I Y I DATED 4/5/05, SHEET B OF B. AS GRADED ME DETENTION VOLUME OF 0.025 AC. FT.
.+5 I (N AND WOCV VOLU OF O.05 AC. FT. IS EXCEEDED AT ME 100 YR. HWTl OF 5043.85,
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I I I I i n 3, pETAININC WALLS BE VERSA-LO< OR EQUAL. INSTALLED PER MANUFACTURERS
4�L I I I NO 555
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All,PHASE 2 GRADING PLAN SHEET
ifI
FORM
NAS PREPARED THESE PLANS. BY E%EWTON AND/OR SEAL
IY AFFIRM RESPONSIBILITY TO ME LOCAL ENTITY. AS
ENGINEERING WORK. FOR ERRORS AND OMISSIONS CONTAINED IN
1PPROVAL OF MESS PLANS BY ME LOCAL ENTITY ENGINEER
ME ENGINEER WHO HAS PREPARED THESE PLANS OF SUCH
MDR, TO ME E%lEN0 RERMITED BY LAW, ME ENGINEER
HOLD HARMLESS AND INDEMNIFY THE LOCAL ENTITY. AND ITS
IYEES, FROM AND AGAINST LIABILITIES, CLAIMS, AND DEMANDS
TOM ERRORS AND OMISSIONS CONTAINED IN MESS PLANS.
AT THESE FINAL CONSTRUCTION PLANS WERE PREPARED UNDER
ION, IN ACCDRONG W1M APPLICABLE CITY OF FORT COLLINS AND
STANDARDS AND STATUTES, RESPECTIVELY; AND THAT I AM
FOR ME ACCURACY OF DESIGN. REVISIONS, AND RECORD
NAVE NOTED ON MESS PLANS
BEEN REVIEWED BY ME LOCAL ENTITY FOR CONCEPT ONLY. ME
PLY RESPWdBUTY BY ME REMEWING DEPARTMENT, ME LOCAL
ME LOCAL DIMITY FOR ACCURACY AND CORRECTNESS OF ME
1ERMORE, ME REVIEW DOES NOT IMPLY THAT THE QUANTITY OF
I ME ME FINAL WANIIES REQUIRED. ME REVIEW SHALL NOT
NY REASON AS ACCEPTANCE OF FINANCIAL RESPONSIBILITY BY
JTR ADDITONA OUMITIES OF ITEMS SHOWN MAT MAY BE
E CONSTRUCION PHASE.
Fort Collins. Colorado
PLAN APPROVAL
x:
City Engineer
Date
D BY:
III h Wastewater Utmty,
Date
D BY:
Storm Water Ut21ty
Date
D BY:
Parks k Recreation
Date
D BY
Traffic Engineer-
Date
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