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Ell�.yt® } Mr James Barton June 14, 2004 Page 7 ' analyses will be collected in brass liners, capped with teflon tape and plastic end caps, and then placed in re-sealable plastic bags The brass liners will then be stored in Iced coolers and transported to a state-certified laboratory under chain-of-custody documentation Selected soil samples will be analyzed for concentrations TPHg using EPA Method 8015M, BTEX and MtBE using EPA Method 8260B Samples selected for laboratory analysis will be ' based on elevated PID readings, sample depth, and soil iithologic data A minimum of one soil sample from each boring will be submitted for chemical analysis Field methods and procedures to be used by ENSR during drilling and installation of the proposed wells are ' summarized in Attachment B The groundwater monitoring wells will be constructed using 2-Inch diameter, flush-threaded, Schedule 40 PVC casing installed to a total depth of approximately 70 feet bgs The wells will ' be screened from 50 to 70 feet bgs with a 0 02-inch machine slotted casing Final screened interval will be based on field observations The annular space will be filled with No 3 Lonestar, or equivalent, sand (filter pack) from 2--feet above the top of the well screen to the maximum ' depth of the well A minimum of 2 feet thick bentonite seal will be placed on top of the filter pack Above the bentonite seal to 1 foot bgs the annular space will be sealed with neat cement grout A concrete surface seal will be installed to set the traffic rated vault box Proposed well Mconstruction details are presented in Figure 3 ' Soil Stockpile Sampling and Disposal Activities Soil cuttings generated during drilling and well installation will be temporarily stored on site either in 55-gallon DOT drums or stockpiled on and under plastic sheeting pending review of disposal options and laboratory sample results Soil samples for chemical analyses will be collected in brass liners and capped with Teflon sheeting and plastic end caps and placed in re- sealable plastic bags The soil samples will then be stored in iced coolers and transported to a ' state-certified laboratory under cram-of-custody documentation for chemical analysis Development and decon rinsate water will be stored on site in appropriately labeled 55-gallon DOT drums and will be disposed of at a Unocal approved facility ' Well Development and Groundwater Sampling The newly Installed groundwater monitoring wells will be developed a minimum of 72 hours after their installation This will allow the neat cement grout seal time to cure The wells will be 1 developed using a surge block and submersible pump Groundwater samples will be collected from the newly developed monitoring wells following development Groundwater samples will be submitted to a state-certified laboratory under chain of custody protocol for analysis of TPHg using EPA Method 8015M, and BTEX and MtBE by EPA Method 8260B • J 1ProiectsW694015098 293TmalkReporlsZ098 Work Plan doc ' Over 30 Years of Excellence in Environmental Services