10002_Rea_Building 6-VMI Letter 2012_12_21

Certification of Vapor Mitigation Installation-Building 6 S&ME Project Number 1353-12-060
Silos, Charlotte, NC (Brownfields Site No. 11009-07-60) December 21, 2012
______________________________________________________________________________________
2
Vapor Mitigation System
As approved in the Notification letter, the vapor mitigation system for Building 6
consisted of a spray-applied (Geo-Seal®) seamless membrane located beneath the
building’s concrete slab and above the ground surface. The membrane consists of a
bottom layer of Geo-Seal Base, then the spray-applied 60-mil (minimum thickness)Geo-
Seal Core, and topped with a Geo-Seal Bond layer. The installation of the vapor
mitigation system was generally installed per the design specified in the approved April
12, 2012 Notification letter and appended Technical Specifications for Vapor Barrier And
Active Venting System, Silos Community (Technical Specifications) dated April 11, 2012
prepared by WSP-Sells. The only deviation from these specifications was the August 24,
2012, NCDENR-approved reduction in specified curing time of the spray-applied barrier
(Geo-Seal Core) prior to collecting thickness measurements. This reduced curing time
was based on information and specifications provided to the NCDENR by the
manufacturer.
Installation Dates
Since Building 6 is a relatively small building, the installation of the vapor barrier was
conducted in one day (December 11, 2012). S&ME was present and observed the
installation and conducted the specified Quality Assurance/Quality Control (QA/QC)
testing, as indicated on Table 1.Figure 4 indicates the approximate location of the
various QA/QC thickness test locations.
QA/QC Testing
As specified in the approved Notification and Technical Specifications, S&ME conducted
and/or observed the following QA/QC testing during membrane installation:
Observed the ground surface for sharp objects prior to installing the barrier
system;
Observed and documented the installation of the Geo-Seal Base;
Observed and documented the installation of the spray-applied Geo-Seal Core;
Observed the sealing of penetrations (i.e., piping, wiring conduits, etc.);
Collected two samples per approximate 1,000 square feet of the Geo-Seal Base
and Geo-Seal Core after application and measured for thickness;
Observed and documented the smoke testing of the membrane installation, prior
to installation of the Geo-Seal Bond layer; and
Observed the installation of the Geo-Seal Bond layer.
FIGURES
Scale: AS SHOWN
Checked by:DAH
Drawn by: RAS
Date:11/1/12
USGS Topographic Map
Silos Site
121 Lancaster Street
Charlotte, North Carolina
Figure
1S&ME Project No.: 1353-12-060
Site Area
Charlotte West USGS Quadrangle dated 1993 and Charlotte East USGS Quadrangle dated 1967 and Photorevised in 1988.
Scale: AS SHOWN
Checked by: DAH
Drawn by: RAS
Date:11/1/12
2009 Aerial Photographic Map
Silos Site
121 Lancaster Street
Charlotte, North Carolina
Figure
2S&ME Project No.: 1353-12-060
Map obtained from Mecklenburg County GIS Website
Site Boundary
Light Rail
Corridor
South
Boulevard
Youngblood
Street
Fairwood
Avenue
Griffith
Street
Lancaster
Street
Remount
Road
Approximate
Scale: 1” = 186’
Silos
SILOS (EXISTING)SILOS (EXISTING)SILOS (EXISTING)
POOL AREA
S I T E C O N C E P T U A L P L A N
P R O P O S E D W O O D F I E L D S I L O S C O M M U N I T Y
L A N C A S T E R S T R E E T & Y O U N G B L O O D S T R E E T
C H A R L O T T E , N O R T H C A R O L I N A
3
1 3 5 4 -1 1 -1 9 8
1 " = 8 0
D D H
1 -1 1 -2 0 1 2
R A S
FIGURE NO.
S C A L E :
P R O J E C T N O :
D A T E :
D R A W N B Y :
C H E C K E D B Y :
W W W .S M E I N C .C O M
REFERENCE:BASE MAP PROVIDED BY DESIGN RESOURCE GROUP, PA. PLEASE NOTE THIS MAP IS FOR INFORMATIONAL PURPOSES ONLY. IT IS NOTMEANT FOR DESIGN, LEGAL, OR ANY OTHER USES. THERE ARE NO GUARANTEES ABOUT ITS ACCURACY. S&ME, INC. ASSUMES NORESPONSIBILITY FOR ANY DECISION MADE OR ANY ACTIONS TAKEN BY THE USER BASED UPON THIS INFORMATION.
0 80 160
Feet ±
12
34
56
SR2SR1
BUILDING 6 VAPOR BARRIERTHICKNESS SAMPLE LOCATIONSWOODFIELD SILOS COMMUNITYLANCASTER STREET & YOUNGBLOOD STREETCHARLOTTE, NORTH CAROLINA
4
1353-12-060
DDH WWW.SMEINC.COM
SCALE:
PROJECT NO:
DATE:
DRAWN BY:
FIGURE NO.
12-19-12
1 " = 20 '
Q :\1 3 5 3 \2 0 1 2 \0 6 0 S i l o s \f i g 4 _V a p o r B a r r i e r S a m p l e s B l d g 6 .m x d
ENGINEERING LICENSE NO: F-0176
±
REFERENCE:BASE FIGURES PROVIDED BY DESIGN RESOURCE GROUP, P.A. AND HOUSING STUDIO, P.A. PLEASE NOTETHIS MAP IS FOR INFORMATIONAL PURPOSES ONLY. IT IS NOT MEANT FOR DESIGN, LEGAL, OR ANY OTHERUSES. THERE ARE NO GUARANTEES ABOUT ITS ACCURACY. S&ME, INC. ASSUMES NO RESPONSIBILITY FORANY DECISION MADE OR ANY ACTIONS TAKEN BY THE USER BASED UPON THIS INFORMATION.Approximate Sample Locations
0 20 40
Feet
TABLE
Table 1
Summary of QA/QC Testing Results
Sample
ID
Average
Thickness1
Pass/
Fail2
1 0.1050 Pass
2 0.1170 Pass
3 0.0893 Pass
4 0.0955 Pass
5 0.1425 Pass
6 0.0936 Pass
SR-1 0.1870 Pass
SR-2 0.1456 Pass
Notes:
N/A = Not Applicable
Yes
12/11/2012
Observe installation of
Base, spray-applied Core
layer, collect thickness
samples, and observe
smoke testing.
Building 6 -
Sprinkler Room
Yes Yes Yes
1 Thickness measured with pre-calibrated calipers.
3 On August 17, 2012, NCDENR verbally approved a reduction in required curing time that reduced the time between application of spray-on barrier (Core layer) and thickness
testing from >24 hrs to same day as application. An email written approval was sent from the NCDENR on August 24, 2012.
Building No. 6 - Silos Community
Poindexter Drive & Griffith Street
Charlotte, Mecklenburg County, North Carolina
S&ME Project No. 1353-12-060
Date Activity Location
Thickness
Measured?
Thickness Measurements Smoke
Testing
Conducted?
NCDENR Brownfields Project No. 11009-07-60
2 Thickness measurement required to be a minimum of 74 mil (0.074") for 14 mil thick Geo-Seal Base layer and 60 mil thick Geo-Seal Core layer in order to meet specification
requirement of 60 mil for Geo-Seal Core layer.
Yes
Smoke
Testing
Pass?
Comment
Building 6 Yes
SITE PHOTOGRAPHS
Silos Community Site
121 Lancaster Street, Charlotte, NC
Project #: 1353-12-060
Sheet 1 of 2
9751 Southern Pine Blvd.
Charlotte, NC 28273
Photo 1
D a t e :
1 2 /1 1 /2 0 1 2
P h o t o g r a p h e r .
J i m m y
G o s n e l l
Location Silos Community – Building No. 6
Remarks Preparation of subsurface for vapor barrier installation.
Photo 2
D a t e :
1 2 /1 1 /2 0 1 2
P h o t o g r a p h e r .
J i m m y
G o s n e l l
Location Silos Community – Building No. 6
Remarks Installing Geo-Seal Base upon subsurface.
Silos Community Site
121 Lancaster Street, Charlotte, NC
Project #: 1353-12-060
Sheet 2 of 2
9751 Southern Pine Blvd.
Charlotte, NC 28273
Photo 3
D a t e :
1 2 /1 1 /2 0 1 2
P h o t o g r a p h e r .
J i m m y
G o s n e l l
Location Silos Community – Building No. 6
Remarks Smoke testing after Geo-Seal Core spray-applied to Base and prior to Bond Layer
being installed.