HomeMy WebLinkAboutSite Certifications - 09/29/2014September 25, 2014
Mr. Glen Schlueter, Mr. Dan Mogen
City of Fort Collins Stormwater
700 Wood Street
Fort Collins, CO 80522
Re: Prospect Station —Storm Drainage Certification
221 Prospect Road
Permit #B1305058
Dear Glen and Dan,
INTPRWEST CON S U LT.I N G G R O U P
Please accept this letter as the Drainage Certification for the Prospect Station project.
Survey of the site was completed on August 13, 2014 by Washburn Surveying.
Site visits were performed on August 14, September 9, and September 22, 2014. Since
the August 141h site visit, the site has been cleaned up, roof drains connected into the
minor pipe systems, curb opening installed on the south side of the site, and the two bio-
retention facilities (rain gardens) and site have been landscaped.
My assessment is that the items constructed are in general conformance with the
approved design. I have attached the checklists used for Multi Family and Commercial
Sites and Bioretention Cells. I have also attached the as -built survey of the site and as -
built drawings for the grading and storm system. Finally, I have attached several photos
of the site visits from August 141h, September 91h and 22W.
We appreciate your time and consideration in reviewing this certification. If you have
any questions or need additional information please feel free to call at any time (970)
460-8471.
Sincerely,
mt;W64 aa_L�
Michael Oberlander, P.E., LEED AP
Colorado Professional Engineer 34288
1218 W. ASH, STE. C, WINDSOR, COLORADO 80550
TEL, 970.674.3300- FAX 970.674.3303
f4-
Photo *22—Sietembber 9,
-a
Photo #3. September 9, manhole north of building needs to be cleaned out.
16 --a L-' `
Photo #4. September 22, manhole has been cleaned out.
Photo #5. September 22, outlet channel to south built, escrow for seeding.
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Project Name: Prospect Station
Date: 9/25/13
Interwest Responses in Red
COMMERCIAL, MULTI -FAMILY AND SUBDIVISION
CERTIFICATION CHECKLIST
Please fill in all applicable items in this Certification Form for Commercial, Multi -Family and
Overall Single Family sites. A copy of the approved grading plan must be submitted with the as -
built grading plan.
Use "OK" for items checked or actual numbers for items verified/surveyed in the field.
Use "N/A" for items that are not applicable to the site that is being certified.
Please provide an As -Built Redlined or Mylar drawing showing the following:
A. Detention Facilities Certification
1. Pond Certification — N/A - NO PONDS
• Provide Topographic Records and Volume Verification Calculations — NIA
• Provide Pond Cross -Sections and Spot Elevations (especially @ Pond Embankment
and Pond Flow Line) — N/A
• Positive Fall to Pan (if applicable) — N/A
• General Pond Grading including all Side -Slopes — N/A
• Invert Elevation — N/A
• Forebay Construction and Elevation — N/A
• Spillway Weir (Location, Elevation, Height, Opening Width) — N/A
• Placement and size of riprap or alternative permanent erosion control measures —
N/A
• Orifice Plate and/or Water Quality Outlet Structure Installation — Confirmed in the
field and installed correctly per drainage design — NIA
• Water Quality Capture Volume (Volume Required, Volume Provided and Water
Surface Elevation)— N/A
• Berm and Embankment Compaction Level — N/A
• Subsurface Media for Water Quality Ponds and Swales — N/A
2. Swales
• Location (are they within easement?) — OK
• Dimension and Cross -Section Verification — OK
City of
Fort Collins
• Longitudinal Slopes and Side -Slopes - OK
• Spot Elevations - N/A
• Permanent Erosion Control Measures (drop structures, riprap, lining)- NO —Need
seed
• Tie-in to Storm Lines, Pans, Curbs, or other appurtenances - OK
• Required Minimum Freeboard, Provided Freeboard - N/A
• Landscaping Infringement on Flow Line? - N/A
3. Pipes
Interwest was not present during the pipeline installation, to our best
knowledge and according to Dohn Construction, the pipeline was installed
in accordance with the approved construction plans and City
Specifications.
• Size and Type- OK, Please see storm plan and profile as -built sheets
• Slopes (As -Built and comparison to 0.4% Minimum) - OK, Please see storm
plan and profile as -built sheets.
• Pipe Capacity Calculations (if slopes are significantly altered from design) - OK
• Invert Elevations - OK
• Installation and Backfill - OK, per Contractor
• Cover - OK
• Encasement and Clearance from other nearby utility lines - OK, per Contractor
• Joints Type and construction - OK, per Contractor
4. Concrete Pan Channels
• Size - OK
• Slope - OK
• Cross Section - OK
• Thickness - OK
• Elevations - OK
5. Inlets
Interwest was not present during the inlet installations, to our best
knowledge and according to Donn Construction, the inlets were installed
in accordance with the approved construction plans.
• Size and Type - OK
2
• Size of Opening (or name of Standard Detail used) — OK
• Grate Elevation — OK
• Invert Elevation — OK
• BoxSize—OK
6. Street Cross -Pans
• Size — OK
• Type — OK
• Grade — OK
• Elevations— OK
• Cross -Sectional Depth — OK
• Tie-in to Curb and Gutter— OK
7. Culverts
• Size —N/A
• Type — N/A
• Invert Elevations— N/A
• Headwalls or Wing Walls— N/A
8. Sub -Drains
See Bioretention Cell Checklist for details.
• Size — N/A
• Type (Perforated/Solid) — NIA
• Cover —N/A
• Backfill — N/A
• Geo-Textile Liners — N/A
• Clean -Outs — NIA
9. Curb Cuts
• Size —OK
• Tie-in to Swale, Pipe or other appurtenances— OK
3
of
Fort Collins
B. Certification of Grade Elevations Adjacent to Drainage Facilities:
• Minimum Opening Elevations— OK
• Top of Foundation Elevations— OK
• Comparison to 100-year Water Service Elevations — OK
• Comparison to Freeboard Elevations and Base Floodplain Elevations — BFE — N/A
C. Certification of Erosion Control Measures:
1. Permanent BMP Measures:
• Permanent Vegetation (no more than 6" bare spots and weeds under control) — OK
• Riprap or alternative permanent erosion material — N/A
• Riprap Bedding— N/A
• Cut -Off Walls or Channel Drop Structures Cross -Sections — N/A
• Sediment Basins — N/A
• Water quality ponds/Sand Filter/Bio Retention Construction and liners — OK
• Permanent Netting Mats or Blankets — N/A
• Mulching and Seeding— OK
2. Temporary BMP Measures:
• Mulching and Seeding— N/A
• Temporary BMP Measures as shown on Erosion Control Plan— N/A
D. Post -Construction Site Cleanup:
• Construction Debris Clean -Up— OK
• Smoothing of Ruts in all Construction Areas— OK
• Reseeding of all Areas Affected by Construction Activities — OK, Ongoing
4
Collins
.Cityof
r `rt`i�
E. Statement of Compliance:
This certification is signed and stamped and by signing this form the Engineer(s) attests that
they have inspected the site and to the best of their knowledge the as -built conditions of
the drainage facilities are as described in the above form and in the As -Built plans enclosed.
Failure to properly disclose all known information could result in the rejection of this
certification and prevent the release of any and all Stormwater Utility permit holds on
Building Permits and/or Certificates of Occupancy within this development.
F. Signature and Stamp by a Colorado Registered Professional Engineer
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RECORD DRAWING
DATE: 9110/14
Al. Ppi W.y1gUPX LAND SYPKYIN:�
8/15/2UN
NOTES, UNITS IOF STREET CLR SHOWN AREAPPROXIMATE. FINALUMRSARETOBE
DETERMINED IN THE FIELD BY THE CITY ENGINEERING INSPECTOR. ALLREPAIRS
SHALL BE IN ACCORDANDC.I7H THE CT' STREETREPAIR STANDARDS.
2, SEE LANDSCAPE PLAN FOR REVEGETATION METHODSAND DETAILS.
3. STORM PIPE CONSTRUCTION SHALLSE RCPCLASS III BEDDED PER
STANDARDS OR MR 35 PVC PIPE BEDDED PERCTIY SANTARYSEWER
STANDARDS.
4 ONSREIMPROVEMENTSWILLBEPRIVATELYOWNEDANDMAINTAINED.
5. ALL U'RLT' CONETRUCIION SHALLCONFORM TO CURRENT STANDARDS AND
SFECIFICATONS
6 ALL EARTHWORK AND PAVEMENTCONSTiUCTON SHALL BE IN ACCORDANCE
WITH THEGEOTECHNICALREPORT FORTHE SRE AND LCUA55 AS APPLICABLE.
ADD A900- FT TO ALL SPOT ELEVATIONS.
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