18037_City_Center_Inn_AWP_20150710

Work Plan for Additional Site Assessment (Revision 1)S&ME Project No. 4335-14-075
SkyHouse II, N. College and 9
th Streets, Charlotte, Mecklenburg County, NC July 10, 2015
2
potential exists for these structures to have used heating oil tanks to store heating oil on the
premises.
Based on discussions in an email sent by Mr. Mike Greene of Novare Group (Novare) to Mr.
Roger Smith of S&ME on June 26, 2015, Mr. Greene requested S&ME prepare a work plan to
address Ms. Eckard’s request that Novare further assess these identified RECs,and to further
assess the soil and groundwater at the site.
As stated above, the Work Plan and Cost Estimate was initially submitted to Ms. Eckard on July 1,
2015 for review and Work Plan approval. On July 8, 2015, Ms. Eckard replied via email with
questions and requested changes to the Work Plan. S&ME submitted an email response on July 9,
2015, that addressed Ms. Eckard’s comments and provided explanations and minor changes to the
work plan. Upon review, Ms. Eckard approved the work plan with the edits and comments on July
9, 2015. The below work plan/scope of services and corresponding cost estimate is revised to
incorporate the approved changes.
WORK PLAN / SCOPE OF SERVICES
Task 1: Project Management, Coordination, SIP, and Health & Safety Plan
S&ME will coordinate with the public (NC OneCall) and private utility locators to evaluate areas
of proposed sample locations on the site Property, and procure a Subsurface Investigation Permit
(SIP), as required by Mecklenburg County. S&ME will also coordinate with a North Carolina
licensed drilling contractor to conduct borings to assess site soils and to install and abandon
temporary monitoring wells to assess the site groundwater, and with a North Carolina certified
laboratory to conduct laboratory analysis of soil and groundwater samples collected from the site.
Additionally, S&ME will also prepare a project health and safety plan in accordance with 29 CFR
1910.120 as required by OSHA.
Task 2: Soil and Groundwater Assessment at Proposed SkyHouse II Building Footprint
Soil Assessment
In order to further assess the site soils for evidence of potential impacts in the area of the proposed
Skyhouse II building,S&ME proposes to conduct up to twelve (12) borings at locations indicated
on the attached figure. The 12 borings are located in accordance with the grid sampling as stated in
the approved Soil Management Plan, Rev. 4 dated October 15, 2014 for “In-place Assessment and
Management of Site Soils”.
The borings will be advanced to a depth of 10 feet, refusal, or to the apparent groundwater surface,
whichever is encountered first using a direct push (Geoprobe®) type drilling rig. During
advancement, soils will be collected continuously from the ground surface to the termination depth
of each boring and the soils will be evaluated for evidence of apparent environmental impacts such
as indications of staining, odors and by collection of organic vapor measurements using a
photoionization detector (PID). Based on the field evaluations, one sample from each boring will
Work Plan for Additional Site Assessment (Revision 1)S&ME Project No. 4335-14-075
SkyHouse II, N. College and 9
th Streets, Charlotte, Mecklenburg County, NC July 10, 2015
3
be selected for submittal to the analytical laboratory for analysis of volatile organic compounds
(VOCs) using EPA Method 8260/5035 and polynuclear aromatic hydrocarbons (PAHs) using EPA
Method 8270. The sample interval selected from each boring for laboratory analysis will be based
on apparent evidence of impacts as listed above. After completion of the borings and soil
sampling, eleven of the borings will be abandoned either by filling with the soil cuttings (if no
groundwater is encountered) or by abandoning with bentonite to just above the ground surface (if
groundwater is encountered) and topped with soil cuttings. The remaining soil cuttings, will be
spread onsite in a vegetative area if no evidence of apparent impacts are noted. If impacts are
suspected in the soil cuttings, they will be either placed in a drum, secured, and labeled as to
contents, or stockpiled on plastic at the site (and covered) until laboratory results are reviewed as to
where and how the soils can be disposed.
Groundwater Assessment
One of the twelve borings will be extended to below the groundwater surface and a temporary
monitoring well installed. The tentatively planned location of temporary monitoring well is in the
approximate center of the proposed building footprint, assuming no evidence of suspected impacts
is observed in the twelve borings (see attached figure). However, should impacts be suspected in a
boring or borings, the temporary monitor well will be installed in the boring which exhibited the
most apparent evidence of impacts, based on field observations during boring advancement.
The temporary monitoring well will be installed to a depth of approximately 30 feet, refusal, or to
approximately 5 feet beyond the apparent groundwater surface, whichever is encountered first
using a direct push (Geoprobe®) type drilling rig. The temporary well will be constructed of 1.25-
inch PVC equipped with 10 feet of 0.010-inch slotted PVC screen and adequate casing to bring the
monitoring well to the ground surface. After installation, the well will be developed in order to
allow groundwater to freely flow into the well. After completion of development, a groundwater
sample will be collected for analysis of VOCs using EPA Method 8260 and semi-volatile organic
compounds (SVOCs) using EPA Method 8270. After completion of the sampling, the monitoring
well will be abandoned by removing the PVC casing and screen, and by filling the borehole with
bentonite to just above the ground surface and topped with soil cuttings.
Task 3: Soil and Groundwater Assessment at the Former Auto Sales/Service Station
Soil Assessment
In order to further assess the site soils and groundwater for evidence of potential impacts at the
former auto sales/service station,S&ME proposes to conduct two (2) borings at locations indicated
on the attached figure. Since there is no definitive location of an area of concern at the former auto
sales/service station, the location of the borings are based on the limited information from the 1963
Sanborn map. One of borings is proposed to be located in the area listed on the Sanborn as “Auto
Body Repair” and the other is proposed to be located in the area indicated as “Auto Service”. The
borings will be advanced to a depth of 30 feet, refusal, or to approximately 5 feet beyond the
apparent groundwater surface, whichever is encountered first using a direct push (Geoprobe®) type
drilling rig. During advancement, soils will be collected continuously from the ground surface to
Work Plan for Additional Site Assessment (Revision 1)S&ME Project No. 4335-14-075
SkyHouse II, N. College and 9
th Streets, Charlotte, Mecklenburg County, NC July 10, 2015
4
the apparent groundwater surface at each boring and the soils will be evaluated for evidence of
apparent environmental impacts such as indications of staining, odors and by collection of organic
vapor measurements using a photoionization detector (PID). Based on the field evaluations, one
sample from each boring will be selected for submittal to the analytical laboratory for analysis of
VOCs and PAH’s using the above referenced methods. The sample interval selected from each
boring for laboratory analysis will be based on apparent evidence of impacts as listed above.
Groundwater Assessment
After completion of the soil sampling, the borings will be extended to below the groundwater
surface (if feasible) and a temporary monitoring well will be installed in each. The temporary
monitoring wells will be installed to a depth of approximately 30 feet, refusal, or to approximately
5 feet beyond the apparent groundwater surface. The temporary wells will be constructed of 1.25-
inch PVC equipped with 10 feet of 0.010-inch slotted PVC screen and adequate casing to bring the
monitoring well to the ground surface. After installation, the wells will be developed in order to
allow groundwater to freely flow into the well. After completion of development, a groundwater
sample will be collected from each well for analysis of VOCs and SVOCs using the above
referenced methods. After completion of the sampling, the monitoring wells will be abandoned by
removing the PVC casing and screen, and by filling the borehole with bentonite to just above the
ground surface and topped with soil cuttings.
In order to establish a relative groundwater elevation and flow direction at the site, the three newly
installed temporary monitoring wells will be horizontally and vertically located, as referenced from
a site benchmark. After the groundwater level has apparently stabilized in each well, a depth to
water surface measurement will be collected and used to generate a relative groundwater surface
elevation.
Task 4: SIP Closure and Reporting
After receipt of final laboratory results, S&ME will provide the required information to
Mecklenburg County to close out the SIP, and summarize the activities, findings, results, along
with conclusions and recommendations within an Additional Site Assessment report for your
review. However, S&ME will provide you with the verbal results and laboratory reports, upon
receipt from the laboratory.
S&ME will compare the soil analytical results to the NCDENR’s Inactive Hazardous Sites Branch
(IHSB) Preliminary Soil Remedial Goals (PSRGs) – residential health based soil remedial goals.
S&ME will compare the groundwater analytical results to the 15A NCAC 2L .0202 Groundwater
Quality Standards and the NCDENR, Division of Waste Management’s Residential Vapor
Intrusion Screening Levels.
EXCLUSIONS
Unless specifically authorized as an addition to the Additional Site Assessment work scope, the
assessment will not include the following:
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SAMPLING LOCATION MAP (Rev. 1)N. COLLEGE STREET SITE300 & 314 NO. COLLEGE STREETCHARLOTTE, NORTH CAROLINA
1
4335-14-075
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SCALE:
PROJECT NO:
DATE:
DRAWN BY:
FIGURE NO.
07-10-15
1 " = 60 '
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ENGINEERING LICENSE NO: F-0176
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#G!Proposed Soil Sample Locations
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Former Residences (Approximate)
Former Auto Sales / Service Station (Approximate)
Proposed SkyHouse II Building
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Feet
REFERENCE: 2015 AERIAL PHOTOGRAPHBASE LAYERS WERE OBTAINED FROM THE MECKLENBURG COUNTY GIS WEBSITE. THISMAP IS FOR INFORMATIONAL PURPOSES ONLY. ALL FEATURE LOCATIONS DISPLAYED AREAPPROXIMATE AND ARE NOT BASED ON CIVIL SURVEY INFORMATION, UNLESS STATEDOTHERWISE.