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(:YA <br /> A S S O C I A T E S I N C <br /> Selected soil samples, at least two from each boring, will be immediately placed on ice and <br /> delivered under chain-of-custody documentation to a State-certified laboratory for analysis. <br /> Samples will be analyzed for total petroleum hydrocarbons as gasoline (TPHg, EPA Method <br /> 8015), total petroleum hydrocarbons as diesel (TPHd, EPA Method 8015), total petroleum <br /> hydrocarbons as kerosene (TPHk, EPA Method 8015), and total petroleum hydrocarbons as <br /> motor oil (TPHmo, EPA Method 8015) benzene, toluene, ethylbenzene, and xylenes (BTEX, <br /> EPA Method 8020), and oxygenate fuel additives (EPA Method 8260). <br /> Well Development and Groundwater Sam lin <br /> Measurement of depth to water in all wells will be completed to evaluate the direction and <br /> magnitude of the groundwater gradient beneath the site. The new wells, MW5 and MW6, will be <br /> developed using surge and bail techniques until the produced water is relatively sediment free. <br /> Prior to the collection of groundwater samples, a minimum of three well volumes (casing and sand <br /> pack) will be purged from wells MW 1 through MW6. Temperature, pH, water elevation, and <br /> electric conductivity will be measured and allowed to stabilize. Water samples will be collected <br /> using disposable bailers, one dedicated to each well. <br /> Groundwater samples collected from all six monitoring wells will be submitted using chain-of- <br /> custody record to a State-certified laboratory. Groundwater samples, four total, will be analyzed <br /> for TPHg, TPHd, TPHk, TPHmo, BTEX, and oxygenate fuel additives. Purge water will be <br /> stored on site in 55-gallon drums approved for hazardous liquid storage pending laboratory <br /> analysis. <br /> Soil Vaaar Extraction Test <br /> Petroleum impacted soil and groundwater can often be remediated using vapor extraction <br /> techniques. Vapor extraction of petroleum hydrocarbon impacted soil utilizes the fact that some <br /> petroleum hydrocarbon constituents can be volatilized or changed from the solid or liquid phase <br /> to the vapor phase at normal temperatures. The movement of air through the soil and <br /> groundwater, which is accomplished by extracting air from the subsurface through vapor <br /> extraction wells, facilitates the volatilization of contaminants to the vapor phase. These <br /> contaminants are then removed from the soil and groundwater by extracting the vapor with the <br /> petroleum hydrocarbons from the subsurface through vapor extraction wells and subsequently <br /> treating the vapor. <br /> ATC will perform a vapor extraction test (VET) to collect site specific data relative to vapor <br /> extraction from the subsurface and evaluate the feasibility of vapor extraction as a remedial <br /> alternative. The results of the pilot test will help to determine the effective radius of influence; to <br /> select the optimum off-gas abatement process; and to develop engineering design criteria for the <br /> construction of a remediation system at the subject site. <br /> w:162577VeporlslwkpinVaMExts.doc 4 <br />