10036_South End Transit_Sub-Slab Soil-Vapor Sampling Letter Report_Final_01-24-13-OCR

January 24, 2013

Mr. Tony Duque
NC Brownfields Program
1646 Mail Service Center, Room 3409-K
Raleigh NC 27699-1646

Re: Sub-Slab Vapor Sampling Results
Transit-Oriented, Multi-Family Residential Project, Southline Apartments
140 Remount Road, Charlotte, North Carolina (the “Property”)
PSI Project Number: 0457116-3
Brownfields Project Number # 10036-06-60

Dear Mr. Duque:

PSI has conducted Post Construction Sub-Slab Vapor Sampling at the Multi-Family
Residential Project, Southline Apartments located in the northeast quadrant of
Remount Road and Dunavant Street in Charlotte, North Carolina. The apartment
complex is currently under construction.
Background
Based on the analytical results of sub-slab vapor samples collected on September 13
and September 28, 2012, vapor concentrations of TCE and chloroform were reported
beneath the upper floor slab of Building 17 and the upper and lower floor slabs of
Building 18 at levels that exceeded the NCDENR IHSB Vapor Intrusion Residential
Screening Levels for Acceptable Soil-Gas Concentrations for TCE and chloroform.

Chloroform was not a chemical of concern addressed in the site Brownfields
Agreement, and chloroform is a common off-gas when city water is used on a
property. At the time of the vapor sampling, the site was under construction and new
water lines were being installed throughout the property. During the installation of
these lines city provided water was released to the subsurface, which would attribute
to the elevated concentrations of chloroform in the soil gas samples. For these
reasons, PSI does not consider chloroform in the soil gas to warrant further testing.

No soil gas exceedances were detected in the soil vapor samples collected from within
the vapor mitigation systems installed in Buildings 8, 9, 10, and 11. No Further
analysis was needed with respect to vapor mitigation at these buildings.

The laboratory also reported concentrations of TCE in vapor samples BLDG 17 Upper,
BLD 18 Upper, and BLDG 18 Lower at 6.4 µg/m3, 5.4 µg/m3, and 22 µg/m3,
respectively, which slightly exceeds the NCDENR IHSB Vapor Intrusion Residential
Sub-Slab Vapor Sampling Results Summary Letter January 24, 2013
Southline Apartments, Charlotte, North Carolina Page 2 of 4
PSI Project No. 0457116

Screening Levels for Acceptable Soil-Gas Concentrations of TCE (4.2 µg/m3). Based
on these laboratory results, additional sub-slab vapor sampling was conducted at
Building 17 and Building 18 on December 14, 2012. This report summarizes those
results.
Sampling Methodology
On December 14, 2012, PSI personnel traveled to the subject site to collect four (4)
sub-slab soil-vapor samples. The soil-vapor samples were collected using 6-Liter
Summa canisters with three (3)-hour flow controlled orifices. The canisters and
regulators were pre-sterilized by the laboratory, and placed under vacuum prior to
shipment to PSI.

As per the approved sub-slab vapor sampling plan, sub-slab vapor samples were
collected from the following locations: Building 17 Lower, Building 17 Upper, Building
18 Lower, and Building 18 Upper (Building 17 and Building 18 are constructed on split
multi-level slabs). Sub-slab sampling tubes are installed in these buildings, extending
to the center of the respective vapor mitigation lateral piping. Prior to sampling, each
sample tube was purged using a peristaltic pump. After purging, a pre-sterilized
summa canister with a three hour regulator and orifice was connected to the sample
tubing. Once the canister was connected, the valve on the summa canister was
opened and the start time and initial vacuum reading was documented. This procedure
was followed for each of the vapor samples collected. After a minimum of three hours,
the canisters were checked to see if the vacuum had dissipated to below 10-inches of
mercury or less. If the vacuum was less than 10-inches of mercury, then the time and
vacuum was documented prior to closing the valve on the summa canister.

At the end of the sampling event, PSI collected the sampling canisters, marked them
with identifying labels, placed them in a shipping container and shipped them under
proper chain-of-custody to Con-test Analytical Laboratory in East Longview
Massachusetts. The collected air samples were analyzed for TCE by EPA Method
TO-15.
Air Sample Results
The laboratory analytical results for the sub-slab vapor samples collected on
December 14, 2012 indicate that TCE was not detected above the laboratory reporting
limit (0.54 ug/m3) in samples 17 Lower and 18 Upper.

The laboratory analytical results for the sub-slab vapor samples collected on
December 14, 2012 indicate that levels of TCE were detected above the laboratory
reporting limits in sample 17-Upper (0.78 ug/m3) and in sample 18 Lower (11 ug/m3).
The sample result for sample 17-Upper was reported below the NCDENR IHSB Vapor
Intrusion Residential Screening Levels - Acceptable Soil-Gas Concentrations (July
2012) of 4.2 ug/m3. The sample result for sample 18 Lower was reported slightly
above the NCDENR IHSB Vapor Intrusion Residential Screening Levels - Acceptable
Soil-Gas Concentrations (July 2012) of 4.2 ug/m3.
Sub-Slab Vapor Sampling Results Summary Letter January 24, 2013
Southline Apartments, Charlotte, North Carolina Page 3 of 4
PSI Project No. 0457116

Conclusions
 No concentrations of TCE in the soil gas above the NCDENR IHSB Vapor
Intrusion Residential Screening Levels for Acceptable Soil-Gas Concentrations
were detected in the soil vapor samples collected from below the slab of
Building 17 and Building 18-Upper. No further analysis is needed with respect
to vapor mitigation at Building 17 and Building 18-Upper.

 Analytical results indicated that the sub-slab vapor samples collected at the
lower floor slab of Building 18-Lower had vapor concentrations that slightly
exceeded the NCDENR IHSB Vapor Intrusion Residential Screening Levels for
Acceptable Soil-Gas Concentrations for TCE. The average levels of TCE under
Building 18-Lower during both screening events is 16.5 ug/m3.

 The buildings at the subject property are underlain with a chemical-resistant
vapor barrier and passive vapor mitigation systems. The specifications for these
systems were approved by Mr. Will Service of the Brownfields Program of
NCDENR on November 10, 2011. The vapor barrier and passive vapor
mitigation systems are operating as designed.

 Based on the laboratory results of sub-slab vapor sampling in Building 18,
levels of TCE decreased from September 2012 to December 2012. Results for
TCE in Building 18-Upper were reported at 5.4 ug/m3 (9/13/2012), and 0.78
ug/m3 (12/14/2012). Results for TCE in Building 18-Lower were reported at 22
ug/m3 (9/28/2012), and 11 ug/m3 (12/14/2012).

Recommendations
Based on the results of the sub-slab vapor sampling event PSI recommends the
following:

 No additional vapor sampling for TCE under Building 17 and Building 18-Upper.

 JLB Southline would like to discuss options with DENR regarding vapor issues
in Building 18-Lower. One option is to determine the actual sub-slab attenuation
factor of Building 18-Lower. In order to determine the sub-slab attenuation
factor of Building 18-Lower, radon samples will be collected through the existing
sample port, and inside of the structure. Radon measurement is proposed to
avoid interferences caused by off-gassing of VOCs by newly installed building
materials. Samples will be collected in Tedlar bags via peristaltic pump, and
analyzed by using scintillation counters and Lucas Cell method for Rn-222. The
analysis will be conducted in accordance with EPA 402-R-92-004, "Indoor
Radon and Radon Decay Product Measurement Protocols", 1992. The
attenuation factor is the ratio of the measured indoor radon levels to the sub-
slab radon levels. If the measured attenuation factor is sufficient to demonstrate
that the reported sub-slab TCE concentrations will not negatively affect the
Sub-Slab Vapor Sampling Results Summary Letter January 24, 2013
Southline Apartments, Charlotte, North Carolina Page 4 of 4
PSI Project No. 0457116

indoor air quality, then the existing passive mitigation system shall be deemed
acceptable with no further testing or modification required.

If you have any questions regarding this letter, please do not hesitate to contact our
office at 704-598-2234.

Sincerely,
PROFESSIONAL SERVICE INDUSTRIES, INC.

Bryan M. Lucas Paul Wachsmuth
Senior Project Manager Principal Consultant
Environmental Services Environmental Services

Enclosure: Table
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Laboratory Results
Page 1 of 14 12L0537_1 Contest_Final_MDL 12 21 12 1610
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Page 7 of 14 12L0537_1 Contest_Final_MDL 12 21 12 1610
Page 8 of 14 12L0537_1 Contest_Final_MDL 12 21 12 1610
Page 9 of 14 12L0537_1 Contest_Final_MDL 12 21 12 1610
Page 10 of 14 12L0537_1 Contest_Final_MDL 12 21 12 1610
Page 11 of 14 12L0537_1 Contest_Final_MDL 12 21 12 1610
Page 12 of 14 12L0537_1 Contest_Final_MDL 12 21 12 1610
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