HomeMy WebLinkAboutLot Certifications - 12/10/2015 (3)CONSTRUCTION
City of Ft. Collin r,021 Plans
Approved By_
Storm Drainage Certification for:
New Mercer Commons II
900 Centre Ave
Fort Collins, Colorado
Permit # B1500355
December 3, 2015
Mr. Wes Lamarque
City of Fort Collins Stormwater
700 Wood Street
Fort Collins, CO 80522
INT13RWEST [ O N S U L.T I N G GROUP
Re: New Mercer Commons II —Storm Drainage Certification
Dear Wes,
Please accept this letter as the Drainage Certification for the New Mercer Commons II
project. Survey of the site was completed on November 24, 2015 by Washburn
Surveying.
My assessment is that the items constructed are in general conformance with the
approved design. I have attached the as -built survey of the site and as -built drawings for
the grading and storm system. I have also attached the checklists used for Multi Family
and Commercial Sites and Bioretention Cells. Finally, the attached photos are from the
dates of October 26 h through November 71h, 2015. Please note that the final landscaping
of the Bioretention Pond was not completed prior to the recent snow and will be done in
the Spring. 11
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,
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
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COMMERCIAL, MULTI -FAMILY AND SUBDIVISION
CERTIFICATION CHECKLIST
Project Name: New Mercer Commons II
Date: 12/2/15
Interwest Responses in
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
• Provide Pond Cross -Sections and Spot Elevations (especially @ Pond Embankment
and Pond Flow Line)
• Positive Fall to Pan (if applicable)
• General Pond Grading including all Side -Slopes
• Invert Elevation
• Forebay Construction and Elevation
• Spillway Weir (Location, Elevation, Height, Opening Width) NIA
• Placement and size of riprap or alternative permanent erosion control measures
R7,za
• 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)
• Berm and Embankment Compaction Level
• Subsurface Media for Water Quality Ponds and Swales
1
G ty of
' 2. Swales `VA - NO SWALES
• Location (are they within easement?) - N/A
• Dimension and Cross -Section Verification - N/A
• Longitudinal Slopes and Side -Slopes - N/A
• Spot Elevations - N "A
• Permanent Erosion Control Measures (drop structures, riprap, lining- N/A
• Tie-in to Storm Lines, Pans, Curbs, or other appurtenances - N/A
• Required Minimum Freeboard, Provided Freeboard - N/A
• Landscaping Infringement on Flow Line? - N/A
3. Pi es
Interwest was not present during the pipeline installation, to our best
knowledge and according to Beacon 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. Constraints of the site force a 0.2%
minimum slope as was designed and approved.
• Pipe Capacity Calculations (if slopes are significantly altered from design) - OK
• Invert Elevations - OK
• Installation and Backfill - OK, per Contractor
• Cover - 0 K
• Encasement and Clearance from other nearby utility lines - OK, per Contractor
• Joints Type and construction - OK, per Contractor
4. Concrete Pan Channels- N/A- NO CONCRET PAN CHANNELS
• Size - N/A
• Slope - N/A
• Cross Section - N/A
• Thickness - N/A
• Elevations - N/A
N
of
City Collins
5. Inlets
Interwest was not present during the inlet installations, to our best
knowledge and according to Beacon Construction, the inlets were
installed in accordance with the approved construction plans.
• Size and Type - OK
• Size of Opening (or name of Standard Detail used) - OK
• Grate Elevation - OK
• Invert Elevation - OK
• Box Size - 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) - N/A
• Cover - N/A
• Backfill - N/A
• Geo-Textile Liners - N/A
• Clean -Outs- N/A
3
ForfCollins
f......
9. Curb Cuts
• Size - N/A
• Tie-in to Swale, Pipe or other appurtenances - N)'P
10. Common Open Spaces- N/A
• Overall grading contours of open spaces- N!A
• Spot elevations adjacent to private lots (property corners) - NIA
B. Grading Certification:
Certification of Grade Elevations:
• 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
!` Verification of site grading:
• Engineer to evaluate site grading compliance with the approved grading plan. - OK
• As -built elevations are to be redlined onto the approved grading plan sheet showing
the as -built spot elevations next to the design spot elevations so compliance can be
verified and documented. - OK
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 - WA
• Riprap Bedding- NI;A
• Cut -Off Walls or Channel Drop Structures Cross -Sections - NiA
• Sediment Basins - N''At
• Water quality ponds/Sand Filter/Bio Retention Construction and liners -- OK
• Permanent Netting Mats or Blankets - OK
• Mulching and Seeding - NIA, Next Season
4
Construction Inspection Checklist for Bioretention Cells: New Mercer Commons II 11-30-15
Item/Activity Yes I No N/A Documentation/Submittal Requirements
Excavation
Heavy equipment did not travel over bioretention cell
during excavation
X
Bottom of cell was "ripped" after excavation
X
Photograph before/after "ripping". Photo 1 and 2.
Bottom of cell is flat and level
X
Photo 3.
Excavated area is protected/surrounded by
sediment/runoff control BMPs during construction
X
Photograph. Area is self-contained.
Inlet
Inlet invert elevation is at least 3 inches above
containment wall/berm
X
Measure/record distance between inlet and top of
containment wall/berm
Upstream catchment drains to inlet
X
Forebay
Forebay is installed according to design specifications
X
Forebay has flat, concrete bottom
X
Outlet structure/Overflow
Outlet structure/overflow elevation is confirmed
X
Measure/record distance from overflow to top of
media filter. Overtops at Back of Walk
Impermeable Liner
Impermeable liner meets design specifications
X
See attached information.
Impermeable liner attached to concrete perimeter wall
X
Photo 4.
Impermeable liner is not exposed
X
Photo S.
Underdrain System
Underdrain pipe is per design specifications
X
At least one cieanout is provided per underdrain lateral
X
Photo 6.
Cleanout pipe is not perforated
X
Cleanouts covers are installed and watertight
X
Underdrain is NOT wrapped in geotextile fabric
X
Underdrain orifice plate installed at outlet structure
X
i
of
ort`i°ilins
D. Post -Construction Site Cleanup:
• Construction Debris Clean -Up — 0K
• Smoothing of Ruts in all Construction Areas - fir,
• Reseeding of all Areas Affected by Construction Activities - OK, Ongoing
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:
Engineer's contact information:
Michael Oberlander
(Name)
moberlander@interwestgrp.com
(Email address)
970-460-8471
(Telephone number)
Interwest Consulting Group
(Company Name)
1218 W. Ash, Suite A
(Company Address)
Windsor, CO 80550
c,00� '•ate
PE STAMP
Underdrain integrity tested after backfilling using TV
and/or water test
X
Filter Media
Filter media composition is per design specifications
X
See attached email documentation.
Filter media was "machine mixed" by supplier prior to
delivery
X
See attached email documentation.
Filter media installed flat and level
X
Photo 7.
Other Structural Components
Containment wall/berm is continuous and level X Photo 8.
Land aping
Final landscaping does NOT include sod
X
Final Landscaping will be completed next season
Final landscaping (wood/rock mulch) is flat and level
X
Final Landscaping will be completed next season
Vegetation is planted according to landscape design
specifications
X
Final Landscaping will be completed next season
Verify that weed barrier is not installed
X
Final Landscaping will be completed next season
Temporary irrigation installed
X
If N/A, then verify that permanent irrigation is
installed to establish/maintain vegetation
Close Out
Upstream catchment stabilized prior to diverting runoff
into bioretention cell
X
Photo 1. Before ripping.
t
Photo 2. After ripping.
R
i
r
Photo 3. Bottom of cell flat and level.
Photo 4. Impermeable liner.
Photo S. Impermeable liner not exposed.
Photo 6. Cleanouts present.
Photo 7. Media flat and level.
Photo 9. Wall continuous and level.
Photo 9. Underdrain. Photo 10. Outlet.
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RU MY 2000B, 3000B & 4000B
Meets GRI-GM17 Standard Specification
® ISO 9001:2008
CENTIRED MANAGEMENT S115TEM
TIIOQF%
ASTM D5199
20.0
21.0
30.0
31.2
40.0
415
mils, (mm)
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(0.78)
(1.00)
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Ibf/in,width, (N/mmwidth)
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120(21)
125(22)
165(29)
180(32)
220(39)
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800
950
800
1000
800
1000
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20
22
27
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30
45
45
60
60
80
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(200)
(200)
(267)
(267)
(356)
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>400min.
OvENAcwGATB5oC(90Days)
ASTMD5721/D5885
Pass
Pass
Pass
UV RESUTAN(E (1600 Hours)
GPo GM11
Pass
Pass
Pass
Moamum UsETB,wtawm
1WF
1801
180OF
82°C
820C
820C
LowTEmP, iw AcT FumTEw
ASTM D746
<-70
-70
-70
F, (0
(<-57)
(<-57)
(<-57)
DLMENXWSTABIu`rv% WX1EE
ASTMD1204
<2
MuwuaALTkw%EtDNGl m
ASTMD5617
>90
>120
>90
>120
>90
>120
A D5397
CRACK W
Appeppends A
> 400
111a H0TO FAILLM
PERMS
ggrains/ft'/hr/in. Hg
�PH
0.022
(grams*/day/mm Hg)
Methoil 73
(0.030)
(0,0g)
(0.014)
1. ., I
BONDED SEAM S70101
ASTM D4545 Mod."
40
45
60
70
75
80
Ibf/invvk h,(N/anvA th)
(70)
(79)
(105)
(119)
(131)
(140)
SEAM PEEL ADHESM
ASTM D4545 Mod."
30
40
45
60
70
85
lbVinwidth,(N/anwiddr)
(53)
(63)
(63)
(93)
(105)
(121)
Nominal Weight [Thousand Square Feet: RUFCO 2000E - 100 lbs., RUFCO 3000B - 150 lbs., RUFCO 4000B - 200 Ibs
Tests are an average of hsD and IJ directions.
•' Raven Industries performs seam testing at 12" per minute.
RUFCO® 20001, 30006 and 40006 are membranes consisting of a veryflexible, linear low -density
polyethylene (LLDPE). LLDPE provides high elongation, tremendous tear resistance and bursting
(SD
strength. A minimum carbon black content of 2.0% provides excellent protection from UV rays and
harsh weather conditions. Manufactured from virgin resins, RUFCO 20000, 3000B and 4000E do
not contain plasticizers which can migrate to the surface, causing premature aging.
Note: To the best of our knowledge, unless otherwise stated, these are typical property values and are intended as {rid
guides only, not as specification limits. Chemical resistance, odor transmission, longevity as well as other performanceLj
criteria is not implied or given and actual testing must be performed for applicability In specific applications and/or
conditions. RAVEN INDUSTRIES MAKES NO WARRANTIES AS TO THE FITNESS FOR A SPECIFIC USE OR
MERCHANTABILITY OF PRODUCTS REFERRED TO, no guarantee of satisfactory results from reliance upon r
contained information or recommendations and disclaims all liability for resulting loss or damage. Limited Warranty
available at www.RavenEFD.coni ❑
. t
Engineered Films Division _ 800-635-3456
P.O. Box 5107 E; efdsales@ravenind.eom scan QR Code to download
INDUSTRIES Sioux Falls, SD57117-5107 www.ravenefd.com current technical data sheets
Ph: (605) 335-0174 • Fx: (605) 331-0333 1/12 EFDtt55 via the Ravenwehsite
RUFCff 2000B,3000B & 4000B
Meets GRI-GM17 Standard Specification
Product Description
RUFCO® 2000B, 3000E and 4000B are membranes consisting of
a very flexible, linear low -density polyethylene (LLDPE). LLDPE
provides high elongation, tremendous tear resistance and
bursting strength. A minimum carbon black content of 2.0%
provides excellent protection from UV rays and harsh weather
conditions. Manufactured from virgin resins, RUFCO® 2000B,
3000E and 4000E do not contain plasticizers which can migrate to
the surface, causing premature aging.
Product Use
RUFCOO 2000B, 3000E and 4000B are used in applications that
require excellent outdoor longevity and chemical resistance.
These are very flexible materials that will conform to uneven
surfaces. Rufco° 2000B, 3000E and 4000B meet the GRI-GM17
Standard Specification.
Size & Packaging
C_ RUFCO® 2000E is available in 50,000 square foot panels and
RUFCO' 3000B in up to 35,000 square foot panels. RUFCO' 4000B
is available in up to 25,000 square foot panels. All panels are
accordion folded and tightly rolled onto a heavy duty core for ease
of handling and time saving installation.
Rufcd
INDUSTRIES
Large Factory Welded Panel
Product Part #
RUFCO................................................................................... 2000B
RU F C O................................................................................... 30008
RUFCO................................................................................... 4000B
APPLICATIONS
Decorative Ponds
Oil Field Pit Liners
Pond/Canal Liners
Mine Tailing Ponds
Outdoor Covers
Interim Landfill Caps
1 Fire Ponds
Waste Water Ponds
Remediation Liners
Golf Course Pond Liners
Vapor Retarders
Brine Ponds
Farm Ponds
Leachate Collection Ponds
i9 2012 RAVEN INDUSTRIES INC. All rights reservt,c:.
Erika Schneider
From: Matthew Holthouse <matthew@beacon-con.com>
Sent: Tuesday, December 01, 2015 5:36 PM
To: Erika Schneider
Cc: Mike Oberlander
Subject: FW: NMC II Raingarden Cert
Erika - See below. Will this work for mix verification?
Mike — I should have you inverts late tomorrow. They have to come re -shoot one man hole.
Matt Holthouse
0:970.212.2432 1 C:970.413.0331
� PO Box 270218, Fort Collins, CO 80527
Aelp conserve our natural resourcesl Do you really need to print this e-mail?
From: Steve Martin [mailto:Steve@martinandsonsco.coml
Sent: Tuesday, December 01, 2015 7:22 AM
To: Matthew Holthouse <matthew(beacon-con.com>
Subject: FW: NMC II Raingarden Cert
Matt
See information from Hageman on the Bio Sand.
Thanks
Steve Martin
Vice President
Martin & Sons Excavating, Inc.
970.635.0404 — Office
970.635.0413 — Fax
970.566.1950 - Cell
From: Roger Hageman [mailto:roaer(@hecinc.net]
Sent: Monday, November 30, 2015 5:09 PM
To: Steve Martin
Subject: RE: NMC II Raingarden Cert
Hi Steve,
This is in response to Ericka's and or Matt's request for clarification concerning the Bio-Retention Sand Media (BSM) that
vas sold by us to Martin and Sons Excavating.
This is the makeup of the BSM:
Martin & Sons Ex
Mixing Portions for Loader Operator
Products Mixed
% of 1cY
Ground Cedar
10%
0%
Sand
65%
Compost
Soil
15%
10%
Totals
100%
We make thousands of Cubic Yards of this material each year.
The material is windrowed and mixed with a large Wildcat mixer, 4 different times before stock piling.
Please let us know if you have further questions.
Roger Hageman
Phone: 970-221-7173
Cell: 970-566-1918
Fax: 970-221-7163
Email: rogerna.hecinc.net
From: Steve Martin [mailto:Steve@martinandsonsco.coml
Sent: Monday, November 30, 2015 2:27 PM
To: Roger Hageman <roeer@hecinc.net>; Matthew Holthouse <_matthew@beacon-con.com>
Subject: FW: NMC II Raingarden Cert
Roger
Could you help me respond to Matt at Beacon Construction concerning the Bio Retention sand.
See message below.
thanks
Steve Martin
Vice President
Martin & Sons Excavating, Inc.
970.635.0404 — Office
970.635.0413 — Fax
970.566.1950 - Cell
From: Matthew Holthouse (mailto:matthewCa�beacon-con.com]
Sent: Monday, November 30, 2015 1:23 PM
To: Steve Martin
Subject: FW: NMC II Raingarden Cert
04
41LICTION & INDUSTRIAL
WHITE CAP
,re dit Services 501 W. Church Street Orlando, FL 32805-2247
If. �HKX DKM �FKS
SOLD TO: 29364000
MAI 4 1 IN s UUNL; LALAVA I WU
18868 WCR 3
BERTHOUD CO 80513
BRANCH ADDRESS
043 - FORT COLLINS
(970) 224-3010
334 S. SUMMIT VIEW DR.
FORT COLLINS CO 80524
INVOICE
50001485445
07/09/2014
STEVE
TERRITORY: PAir— N—Tr( T.
SHIP TO: 29364999 NDS WHITE CAP CONST SUPPLY
P.O. Box 4852
ORLANDO,FL 32802-4952
P.ot.'."P4151A 4 for,
18868 WCR 3
BERTHOU D CO 80513
-14rx"
416 ;-,;13 1 6,111 .i.
•l7><iifl hi- --r
i 7
O6/24f2014
13770309
SIEVE MARTIN
TROY,
SETH J
BURROW,
DENNIS
MAP
2. OUR TRUCK
0
0
1
0.00
1
DELIVERY TAG#: 1657944
SHIPPING NOTES: PLEASE DELIVER TODAY
I
SPfRUFC030008
RUFCO 30008
1200
0.75 SOF
0
1200
900.00
31.501
2
SHIPPING
SHIPPING AND HANDLING
1
75.00 EA
0
1
75.00
0.001
For questions regarding this invoice please call 1-800-WHITECAP
(1-800-944-8322).
TOTAL GROSS 975.00,
TOTAL TAX 31.501
NO REFUNDS OR EXCHANGES ON NON STOCK MERCHANDISE
Visit http:/Avhftecap.com/misc/terms — and conditions.pdf to view complete terms and
TOTAL SHIPPING
ANDHANDLING 0.00
RECEIVED BY DANSUNTZ SIGNATURE COPY ON FILE
Ph"
. . . . . . . . .
1,006.50
Page 1 of 1