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A S S O C I A T E S I N C <br /> While the sampler is advanced, O-ring seals and an expendable drive point will provide a <br /> watertight system to ensure sample integrity. <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 tubing <br /> with a check valve attached to one end will be inserted down the casing until it is immersed in <br /> groundwater. Water will then be pumped through the tubing and to the ground surface by <br /> oscillating the tubing up and down. <br /> Following soil and groundwater sample collection; the borings will be backfilled with neat cement <br /> grout to the ground surface. All drill cuttings, if any,will be stored on-site in a 5-gallon container <br /> pending laboratory results. <br /> Sample Analysis <br /> Selected samples will be immediately ,placed on ice and delivered under chain-of-custody <br /> documentation to American Environmental Network (AEN), a State-certified laboratory, for <br /> analysis. Soil and groundwater samples will be analyzed for total petroleum hydrocarbons as <br /> gasoline (TPHg) using EPA Method 8015 Modified, benzene, toluene, ethylbenzene, and xylenes <br /> (BTEC using.EPA Method 8020, oxygenate fuel additives using EPA Method 8260, and total <br /> lead. <br /> Report Preparation <br /> Upon completion of all field activities, a summary report will be prepared for submittal to <br /> PHS/EHD. ATC will prepare a report that will include a description of all field activities, <br /> laboratory analytical results,boring logs, and recommendations. <br /> All work described in this workplan will be performed under the direction of a California <br /> Registered Professional Engineer. All field work will be completed in accordance with ATC's <br /> Site Safety Plan{SSP) and Quality Control/Quality Assurance Plan on file with PHS/EHD. <br /> Proiected Schedule <br /> Once approval of this workplan has been received, ATC will schedule drilling activities. State <br /> Cleanup Fund preapproval for this scope of work was received April 10, 1998. It is anticipated <br /> the drilling will be completed in one day. ATC will notify PHS/EHD at least 48 hours :prior to <br /> beginning any field activities. The summary report will be submitted to PHS/EHD approximately <br /> four to.five weeks after the completion of field activities. <br /> wM4981\repods\wkpIdoc 3 <br />