ARCHIVED REPORTS_XR0008259 CASE 2

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12/02 '02 TUE 09 14 FAX 19259469968 ERMWEST WC IM004 Mr Harlin Knoll i 15 June 1999 Page 3 investigation are as follows • MW-1 -upgradient(southwest) of the former tank location, • MW-2-adjacent (southeast) of the former tank location, • MW-3 - downgradient (northeast) of the former tank location, and • 13-7- adjacent (northwest) of the former tank location The following sections present the procedures for perforrrung investigation activities. Soil Investigation ERM subcontracted Sub Dynamics, a private utility locator service and Underground Service Alert to identify subsurface utilities in the • boring/well locations prior to drilling Gregg Drilling and Testing, Inc, of Martinez,California, performed all drilling activities Soil borings were advanced using a truck-mounted, hollow-stein auger drilling technique Samples were collected with a split-spoon sampler measuring 2-Inches in diameter and 18 inches in length Soil samples were collected every 5 feet from ground surface down to the water table, approximately 38 feet below ground surface (bgs) Soil samples collected for laboratory analyses were placed in brass tubes,capped with Teflon tape and sealed with a polyethylene lid An ERM geologist recorded lithologic classifications using the Unified Soil Classification System on soil boring logs All soil samples were screened for volatile organic compounds (VOCs) in the field with a photoionization detector (PID) PID screening results and soil classifications are presented on soil boring logs included as Appendix A Drill cuttings were drummed and temporarily stored on site. ERM submitted representative soil samples for laboratory analysis based on PID screening and field observations Analysis of soil samples was performed to define the horizontal and vertical extent of impact All samples submitted for laboratory analysis were labeled and placed in a . cooled ice chest for shipment Soil samples were submitted for laboratory analysis of the following compounds.