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v <br /> v <br /> A S S O C I A T E S I N C <br /> When the tool has been advanced to the desired depth, extension rods will be sent downhole to <br /> brace the bottom of the sample screen as the tool casing is retracted. When the casing is <br /> retracted, up to 41-inches of screen with slot sizes of 0.004 inches will be exposed. Teflon <br /> tubing with a check valve attached to one end will be inserted down the casing until it is <br /> immersed in groundwater. Water will then be pumped through the tubing and to the ground <br /> surface by oscillating the tubing up and down. <br /> Following soil and groundwater sample collection, the borings will be backfilled with neat �- <br /> cement grout to the ground surface. All drill cuttings, if any, will be stored on-site in a 55-gallon <br /> container pending laboratory results. <br /> Placement of Borings <br /> One CPT soil boring will be located immediately adjacent to the former UST locations to further <br /> evaluate the vertical extent of impacted groundwater and subsurface soil lithology. <br /> Three Geoprobe® soil borings will be located down-gradient from the former UST locations to <br /> further determine the lateral extent of petroleum affected soil and groundwater. The borings will <br /> be located between wells MW4 and MW5 to determine if impacted groundwater is migrating <br /> between the wells in the general direction of groundwater flow. <br /> Sample Analysis <br /> Selected soil samples will be immediately placed on ice and delivered under chain-of-custody <br /> documentation to a State-certified laboratory for analysis. Samples will be analyzed for total <br /> petroleum hydrocarbons as gasoline (TPHg) by EPA Method 8015, and for oxygenate fuel <br /> additives by EPA Method 8260B. <br /> Groundwater Sampling <br /> Groundwater samples collected from the borings will be submitted using chain-of-custody record <br /> to a State-certified laboratory. Groundwater samples will be analyzed for total petroleum <br /> hydrocarbons as gasoline by EPA Method 8015, and for oxygenate fuel additives by EPA <br /> Method 8260B. <br /> �� �!.+yt �Ev� <br /> Report Preparation <br /> Upon completion of the subsurface investigation activities, a summary report will be prepared for <br /> submittal to the EHD. The report will include a description of all field activities, laboratory <br /> analytical results, and boring logs. Additionally, the report will include lateral and vertical <br /> extents of hydrocarbons in soil and groundwater. <br /> wA14885\reports\wkpin.doc 4 <br /> 1 <br />