18038_AquAir II_SV and Soil Workplan_20151203

Terracon Consultants, Inc.2020-E Starita Road Charlotte, NC 28206
P [704] 509 11777 F [704] 509 1888 terracon.com
December 3, 2015
Mr. Randle Rose
Director of Real Estate
McGrath RentCorp
5700 Las Positas Road
Livermore, California 94551
E:[e-mail]
RE: Revised Proposal for Soil Sampling and Soil Vapor Investigation
Aquair II Brownfields Site
13300 Sam Neely Road
Charlotte, Mecklenburg County, North Carolina
Terracon Proposal: P71157E108
Dear Mr. Rose:
Terracon Consultants, Inc. (Terracon) is pleased to submit this revised proposal to McGrath
RentCorp to conduct soil sampling and soil vapor investigation activities at the above-referenced
site. The project information, Terracon’s scope of services, schedule and budget requirements
are provided in the following sections.
A. PROJECT INFORMATION
The vacant and mostly wooded site is located at 13300 Sam Neely Road in Charlotte,
Mecklenburg County, North Carolina. The site is described as approximately 75 acres which is
a portion of a larger parcel (Mecklenburg County tax parcel 20141101) comprised of 153.92
acres. The site is generally characterized as the portion of the larger parcel located south and
west of railroad tracks that traverse the larger parcel. The 153.92-acre parcel is currently
owned by Westinghouse Real Estate Development, LLC. Formerly, the site was operated as a
manufacturer of diatomaceous earth and vanadium pentoxide and later as a chemical blending
and solvent reclamation facility until approximately 1988.
The site is bound to the north and northeast by railroad tracks and the remaining portions of the
larger 153.92-acre parcel. The site is bordered to the east by railroad tracks and industrial
development consisting of Layne Inliner, Site Works and Safety Kleen Systems. A residential
neighborhood is located to the south of the property and industrial development is located to the
Revised Proposal for Soil and Soil Vapor Investigation
Aquair II Brownfields Site ■ Charlotte, North Carolina
December 3, 2015 ■ Terracon Proposal No. P71157E108
Responsive ■Resourceful ■Reliable 2
west of the site consisting of Texas Pipe & Supply and Alro Steel. Based upon topographic map
interpretation and site observations, the groundwater flow direction at the site is inferred to flow
to the east towards and unnamed tributary of Steele Creek which is located east of the railroad
tracks.
Based on available historical information, the site was mostly farm land with apparent rural
residential structures from at least 1938 until development of two buildings on the site in the
mid-1960s. Reportedly, the buildings were occupied by Chemical Development and Estimate
Corporation (a.k.a. Regent Land Company or Regent Company) which manufactured
diatomaceous earth and vanadium pentoxide until 1972. From 1974 to 1977, the central portion
of the property was occupied by Chemtrol Corporation which blended hydroxyacetic acid and
water and conducted solvent reclamation activities. Aquair leased the property in 1977, shortly
after Chemtrol ceased operations at the site, and began solvent reclamation activities and
manufacturing of chromium compounds. Aquair ceased reclamation operations in 1986 but
continued to produce chromium compounds until 1988. Reportedly, the site has been vacant
since 1988. The on-site buildings were demolished in approximately 2000. Based on the
former operations at the site and the property having been admitted into the North Carolina
Brownfields Program, the documented impacts to the site are considered to be a Controlled
REC (or CREC) because the impacts on the property are maintained by either engineered or
administrative controls.
According to a review of various assessment reports and regulatory information, the North
Carolina Department of Environmental Quality (NCDEQ) Superfund Section conducted Phase I
and Phase II Site Screening activities at the property in 1990. As a result of the NCDEQ
findings, Delta Environmental Consultants (Delta) was contracted to perform a comprehensive
assessment of the site in 1992 and 1993. Delta detected soil and groundwater contamination
on the site which prompted the facility to be listed as a North Carolina Inactive Hazardous Site
(Aquair Corporation Site, NCD074511361). In 1999, stabilization measures were conducted at
the site including the removal of vanadium pellets, debris and a septic tank system and the
installation of a bedrock aquifer groundwater recovery system. In 2003, S&ME began
assessment activities to delineate the contamination in the soils and groundwater. The soil
areas were identified as vanadium pellet storage areas, the septic tank and drain field, and
areas beneath the footprint of the production building and the aboveground storage tank farm.
Groundwater contaminants extended from the facility to the east, beyond the railroad tracks to
other portions of the 153.92-acre parcel. Vanadium and chlorinated compounds were the major
constituents of concern in the soils and groundwater. In 2004, S&ME installed an air sparge
remediation system to work in conjunction with the bedrock aquifer recovery system. The
remediation systems continued operation at the site until 2011. The systems effectively
reduced the magnitude of the contaminant plume but constituent concentrations were still
relatively high. In 2011, the current owner of the property (Westinghouse Real Estate
Revised Proposal for Soil and Soil Vapor Investigation
Aquair II Brownfields Site ■ Charlotte, North Carolina
December 3, 2015 ■ Terracon Proposal No. P71157E108
Responsive ■Resourceful ■Reliable 3
Development Corporation) initiated a Brownfields Agreement with the NCDEQ in their “Ready
for Reuse” program that included the entire 153.92 acre parcel. As part of the Brownfields
agreement, soil vapor sampling was conducted at the site that detected chlorinated compounds
above non-residential vapor screening levels. A receptor survey indicated no water supply wells
are located within 0.5 miles of the site. TKC Land Development II, LLC (TKC) submitted a
Brownfields Application in 2014 as a Prospective Developer (PD). In July 2015, TKC executed
a Brownfields Agreement with the NCDEQ with the following stipulations:
1) NCDEQ will not require active groundwater remediation.
2) Development at the site is restricted to industrial, office, retail or other commercial
use. Multi-family residential may be developed in the southwest portion of the site.
3) An Environmental Management Plan (EMP) must be developed if disturbances in the
soil contamination areas are planned. The restriction does not include disturbances
of less than 6 inches from surface.
4) A vapor intrusion mitigation plan must be developed if buildings are constructed in
the area of groundwater contamination. The plan must be approved by the NCDEQ.
5) Abandonment of wells on the property requires notification to the NCDEQ thirty days
prior to the beginning of activities.
6) An annual report must be submitted to the NCDEQ which documents redevelopment
changes to the site.
7) Limited groundwater monitoring will be conducted on portions of the 153.92-acre
parcel, not including the site considered for acquisition by McGrath RentCorp.
The outline and location of proposed future buildings is shown on Figure 1.
B. SCOPE OF SERVICES
Task 1 – Soil Sampling
Soil samples will be collected in the area where impacted soil is known to exist on the site. This
area is hatched brown on Figure 1 and is based on an existing brownfields survey plat. The
location of the proposed soil borings will be established in the field with a decimeter accuracy
GPS unit. The same unit will also be used to record boring locations. Development plans
potentially include the removal and grading of the upper 0.5 feet of soil in this area. To evaluate
the current conditions of the surface soils, 13 soil samples (SB-01 through SB-13) and one
(blind) duplicate sample will be collected from a depth of 0 to 0.5 feet below ground surface
(bgs) interval. Soil samples may also be collected from the borings for the soil vapor points as
described in the next section. Proposed sample locations are shown on Figure 1.
Revised Proposal for Soil and Soil Vapor Investigation
Aquair II Brownfields Site ■ Charlotte, North Carolina
December 3, 2015 ■ Terracon Proposal No. P71157E108
Responsive ■Resourceful ■Reliable 4
The borings will be advanced manually using a clean hand auger. Prior to advancing each
boring, the hand auger will be cleaned. The samples will be submitted for laboratory analysis of
volatile organic compounds (VOCs) by EPA Method 8260, semi-volatile organic compounds
(SVOCs) by EPA Method 8270, and the following metals by EPA Method 6010B/7470:
Antimony, arsenic, barium, beryllium, cadmium, chromium, cobalt, copper, iron, lead, mercury,
nickel, selenium, silver, thallium, vanadium, and zinc. Sampling methodologies are depicted on
Table 1.
Soil samples will be collected and placed in laboratory provided containers, labeled, and placed
on ice in a cooler which will be secured with a custody seal. The samples and completed chain-
of-custody forms will be transported to Pace Analytical in Huntersville, NC, a North Carolina
certified analytical laboratory, on a standard analytical schedule.
Task 2 – Soil Vapor Sampling
RATIONALE AND OBJECTIVE
The soil vapor (SV) investigation is designed to evaluate potential vapor intrusion concerns and
potential subsurface impacts from historical on-site or off-site conditions identified during
previous Phase 1 and 2 assessments. The investigation will assess the potential for vapor
intrusion impacts to the future development of the site.
Specifically, the proposed investigation is focused on the area where the future slab on grade IC
Building and the future office building (mobile unit with a crawlspace, stabilized on a raised
masonry block foundation) are proposed. Currently, this area is covered by grass and trees.
Four shallow SV samples are proposed in the area within the proposed building footprint. The
proposed sample locations are labeled SV-01 through SV-04 on Figure 1. The approximate
extents of the future buildings are shown in blue.
INSTALLATION AND SAMPLING METHODOLOGY
Technical approaches and methods outlined in this soil vapor investigation proposal are in
general accordance with the Interstate Technical and Regulatory Council’s Vapor Intrusion: A
Practical Guideline (2007) and Vapor Intrusion Pathway: Investigative Approaches for Typical
Scenarios (2007), as well as DWMs Vapor Intrusion Guidance (2014).
Terracon will attempt to advance soil borings utilizing a hand auger at the three proposed SV
sample locations. Borings for the shallow SV points will be advanced to a depth of about 5 feet
bgs or hand-auger refusal, whichever is shallower. No SV points will be installed shallower than
Revised Proposal for Soil and Soil Vapor Investigation
Aquair II Brownfields Site ■ Charlotte, North Carolina
December 3, 2015 ■ Terracon Proposal No. P71157E108
Responsive ■Resourceful ■Reliable 5
3 ft bgs to avoid drawing ambient air into the SV screen (short-circuiting). Groundwater is not
anticipated to be present in the three borings.
Unsaturated zone soils will be screened utilizing a photo-ionization detector (PID). A soil
sample will only be collected from each boring that exhibits PID readings greater than 10 parts
per million (ppm) or if staining or odors are apparent. Potential soil samples are labeled SB-14
through SB-17 on Figure 1. The samples will be submitted for laboratory analysis of volatile
organic compounds (VOCs) by EPA Method 8260.
Soil samples, if collected, will be placed in laboratory provided containers, labeled, and placed
on ice in a cooler which will be secured with a custody seal. The samples and completed chain-
of-custody forms will be transported to a North Carolina certified analytical laboratory on a
standard analytical schedule.
A new, 6 or 12 inch long stainless steel wire mesh soil gas screen attached to Teflon tubing will
be inserted into the boring and the annular space between the implant and the boring will be
backfilled with well filter pack sand to 0.5 feet above the top of the screen. Hydrated bentonite
grout will be used to fill the remainder of the borehole to ground surface.
Prior to drilling activities, Terracon will contact NC-One Call, a public utility locating service, to
locate on-site underground utilities. In addition, Terracon will engage a private utility locator to
identify underground utilities that could be present at the proposed boring locations.
In order to test the integrity of the vapor sampling point seal, both a shut-in test and a helium
tracer test will be conducted at each sample point. In addition to the tracer test performed in the
field, one sample will be analyzed for helium by the analytical laboratory. One duplicate soil gas
sample will be collected to assess laboratory method precision.
The interior volume of each sample point will be purged to ensure the conditions inside the point
reflect soil vapor conditions. After purging, soil vapor samples will be collected in a laboratory
supplied, pre-cleaned Summa canister with a flow controller set for 5 minutes. The vacuum
pressure of the sample canister will be monitored and recorded at regular intervals throughout
the sampling period.
An outdoor air sample (OA-01) will also be collected concurrently with the soil vapor samples to
assess the presence of VOCs in ambient air. The outdoor air sample will be collected upwind of
the soil gas sample points and the sample intake will be located approximately 5 feet above
ground surface. The ambient air sample will also be collected in a laboratory supplied Summa
canister through a section of tubing attached to a flow controller set for 4-6 hours.
Revised Proposal for Soil and Soil Vapor Investigation
Aquair II Brownfields Site ■ Charlotte, North Carolina
December 3, 2015 ■ Terracon Proposal No. P71157E108
Responsive ■Resourceful ■Reliable 6
Following completion of the field activities, the Summa canisters (6 canisters/samples), along
with chain-of-custody documentation, will be shipped to Eurofins AirToxics, Inc. in Folsom,
California for laboratory analysis of volatile organic compounds (VOCs) by EPA Method TO-15,
TO-15 Low Level, and ASTM-1946 (helium). The complete analyte list will be reported for each
respective analytical method.
Task 3 - Preparation of the Soil Vapor Investigation Report
Upon completion of site activities and receipt of the analytical results, a written report will be
prepared that will include the following items:
· Documentation of field activities;
· Site plan showing pertinent site features;
· Sampling point construction diagrams/locations;
· Analytical laboratory results;
· Data evaluation and presentation of findings; and,
· Recommendations concerning further action, if necessary.
Task 4 – Preparation of an Environmental Management Plan
Terracon will prepare an Environmental Management Plan (EMP) for the proposed
redevelopment activities at the site. The EMP is required under the Brownfields Agreement to
protect the health and safety of the workers during redevelopment activities and post-
development activities and to establish criteria for handling impacted media if encountered
during redevelopment.
Schedule
Terracon is prepared to commence work on this project within one week of receipt of written
notification to proceed. It is anticipated that our field activities will be completed in
approximately two days. Laboratory results should be available 4 business days after receipt of
samples by the analytical laboratory. The final written report would be submitted to McGrath
RentCorp approximately three weeks after field activities have been concluded. This written
report will reflect final results, findings and recommendations, and will take precedence over any
verbal reports that Terracon personnel may have provided.
All field services will be performed under modified Level D safety personal protective equipment.
The analysis, comments and recommendations presented in the written report will be based on
the information obtained during or assessment activities.
Revised Proposal for Soil and Soil Vapor Investigation
Aquair II Brownfields Site ■ Charlotte, North Carolina
December 3, 2015 ■ Terracon Proposal No. P71157E108
Responsive ■Resourceful ■Reliable 7
Terracon’s services will be performed in a manner consistent with generally accepted practices
of the professional undertaken in similar studies in the same geographic area during the same
time period. Terracon makes no warranties, expressed or implied, regarding its services,
findings, conclusions or recommendations. Please note that Terracon does not warrant the
work of laboratories, regulatory agencies or other third parties supplying information used in the
preparation of the report. These assessment services will be performed in accordance with the
scope of work agreed by you, our client, as set forth in this proposal and are not intended to be
in strict conformance with the previously discussed guidance documents.
Findings, conclusions and recommendations resulting from these services will be based upon
information derived from on-site activities and other services performed in accordance with this
scope of work. Such information is subject to change over time. Certain indicators of the
presence of hazardous substances, petroleum products, or other constituents may have been
latent, inaccessible, unobservable, undetectable or not present during the performance of these
services; thus, we cannot represent that the site is free of hazardous or toxic substances,
petroleum products, or other latent conditions beyond those identified during this assessment.
Subsurface conditions may vary from those encountered at specific borings or wells or during
other surveys, tests, assessments, investigations or exploratory services; the data,
interpretations, findings and our recommendations are based solely upon data obtained at the
time and within the scope of these services.
C.COMPENSATION
Compensation information is included in a separate document.
Revised Proposal for Soil and Soil Vapor Investigation
Aquair II Brownfields Site ■ Charlotte, North Carolina
December 3, 2015 ■ Terracon Proposal No. P71157E108
Responsive ■Resourceful ■Reliable 8
D. AUTHORIZATION
The terms, conditions, and limitations in the attached Agreement for Services between Terracon
Consultants, Inc. and McGrath RentCorp, and sections of this proposal incorporated herein,
shall constitute the exclusive terms and conditions and services to be performed for this project.
If this proposal meets with your approval, please sign the attached Agreement for Services and
return a signed copy to our office via fax at 704 509-1888, e-mail or mail to our Charlotte Office.
We appreciate the opportunity to provide this proposal and look forward to working with you on
this project. If you have any questions or comments regarding this proposal, please contact us
at [phone].
Sincerely,
Terracon Consultants, Inc.
Carlo Zanon, P.G.Christopher L. Corbitt, P.G.
Senior Staff Geologist Senior Project Manager
Attachments: Figure 1 – Proposed Soil and Soil Vapor Sample Locations
Table 1 – Sample and Analysis Plan
Agreement for Services
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Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AEX, Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS User
Community
PH. [phone] terracon.com
2020 STARITA RD, SUITE E CHARLOTTE, NC
FIGURE
1
PROPOSED SOIL AND SOIL VAPOR SAMPLE LOCATIONS
PROPOSED MCGRATH RENTCORP FACILITY
13300 SAM NEELY ROAD
CHARLOTTE, NC
P71157E108
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11/30/2015
Project No.:
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1 inch = 150 feet
Legend
Site Boundary
!U Outdoor Air Sample
!U Proposed Soil Vapor and Soil Sample Location
!(Proposed Surface Soil Sample Location (0-0.5 ft bgs)
Proposed Building Footprints
Area of Soil Contamination
Tax Parcel Boundaries
Notes:
- ft bgs = feet below ground surface
- Locations of building footprints and site features are approximate.
- Sample locations may be adjusted based on field conditions.- Parcel data obtained from Mecklenbrug County GIS website.
- Area of impacted soil based on 2015 Brownfields Survey Plat.
Table 1
Sampling and Analysis Plan
Aquair II Brownfields Site
13300 Sam Neely Road
Charlotte, Mecklenburg Couny, NC
Terracon Proposal No. P71157E108
SAMPLE ID SAMPLE MEDIUM SAMPLE INTERVAL (FT BGS)ANALYTICAL METHODS
SB-01 Soil 0-0.5 8260 (VOCs); 8270 (SVOCs); 6010B/7470 (Metals)
SB-02 Soil 0-0.5 8260 (VOCs); 8270 (SVOCs); 6010B/7470 (Metals)
SB-03 Soil 0-0.5 8260 (VOCs); 8270 (SVOCs); 6010B/7470 (Metals)
SB-04 Soil 0-0.5 8260 (VOCs); 8270 (SVOCs); 6010B/7470 (Metals)
SB-05 Soil 0-0.5 8260 (VOCs); 8270 (SVOCs); 6010B/7470 (Metals)
SB-06 Soil 0-0.5 8260 (VOCs); 8270 (SVOCs); 6010B/7470 (Metals)
SB-07 Soil 0-0.5 8260 (VOCs); 8270 (SVOCs); 6010B/7470 (Metals)
SB-08 Soil 0-0.5 8260 (VOCs); 8270 (SVOCs); 6010B/7470 (Metals)
SB-09 Soil 0-0.5 8260 (VOCs); 8270 (SVOCs); 6010B/7470 (Metals)
SB-10 Soil 0-0.5 8260 (VOCs); 8270 (SVOCs); 6010B/7470 (Metals)
SB-11 Soil 0-0.5 8260 (VOCs); 8270 (SVOCs); 6010B/7470 (Metals)
SB-12 Soil 0-0.5 8260 (VOCs); 8270 (SVOCs); 6010B/7470 (Metals)
SB-13 Soil 0-0.5 8260 (VOCs); 8270 (SVOCs); 6010B/7470 (Metals)
SB-14 Soil 0-5'8260 (VOCs); 8270 (SVOCs); 6010B/7470 (Metals)
SB-15 Soil 0-5'8260 (VOCs); 8270 (SVOCs); 6010B/7470 (Metals)
SB-16 Soil 0-5'8260 (VOCs); 8270 (SVOCs); 6010B/7470 (Metals)
SB-17 Soil 0-5'8260 (VOCs); 8270 (SVOCs); 6010B/7470 (Metals)
DUP-01 Soil 0-5'8260 (VOCs); 8270 (SVOCs); 6010B/7470 (Metals)
EB-01 Water Not Applicable 8260 (VOCs); 8270 (SVOCs); 6010B/7470 (Metals)
SV-01 Soil Vapor (Gas)5 TO-15
SV-02 Soil Vapor (Gas)5 TO-15
SV-03 Soil Vapor (Gas)5 TO-15
SV-04 Soil Vapor (Gas)5 TO-15
DUP-02 Soil Vapor (Gas)5 TO-15
OA-01 Outdoor Air (Gas)Not Applicable TO-15 Low-Level
Notes:
ft bgs - feet below ground surface
One duplicate sample will be collected for soil and one duplicate sample will be collected for soil vapor. The sample locations for duplicate samples will be determined in the field.
Metals analysis for soil and water samples to include the following analytes: Antimony, arsenic, barium, beryllium, cadmium, chromium, cobalt, copper, iron, lead, mercury, nickel, selenium, silver,
thallium, vanadium, and zinc.