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//4S=_ GEOMATRIX All soil and groundwater samples were collected following Geomatrix protocols. Mr. Infuma of PHS-EHD observed all soil and groundwater sampling procedures. Soil samples were collected inside the clear liners. The sample ends were covered with Teflon sheets, capped, and sealed with duct tape. Groundwater samples were collected in containers provided by the analytical laboratory. Liners and containers were labeled, placed in air-tight plastic bags, and stored in an ice-cooled chest prior to being transported to a State-of-California certified laboratory under Geomatrix chain-of-custody procedures. Soil samples were analyzed by American Environmental Network (AEN) of Pleasant Hill, California for benzene, toluene, ethylbenzene and total xylenes (BTEX) using EPA Method 8020, polyaromatic hydrocarbons (PAHs) using EPA Method 8310, and total extractable petroleum hydrocarbons (TEPH) using EPA Method 8015M quantified against a San Joaquin Valley crude oil standard provided by CPL. The grab groundwater sample was analyzed by AEN for BTEX using EPA Method 8020, PAHs using EPA Method 8310, total purgeable petroleum hydrocarbons (TPPH) using EPA Method 8015M quantified against a gasoline standard, and TEPH using EPA Method 8015M quantified against a diesel standard. Prior to the TEPH analysis, a silica gel clean-up was performed on the sample extract to remove polar biogenic material (non-petroleum hydrocarbons)that may interfere with analytical results. 3.2 TEMPORARY WELL INSTALLATION AND SAMPLING On 13 June 1997, a temporary monitoring well was installed approximately 5 feet east of former soil boring location SB-2 (Figure 2). Prior to field activities, Geomatrix obtained a well installation permit from the PHS-EHD, a copy of which is included in Appendix B. Well TW-1 was installed by Gregg Drilling and Testing, Inc., of Martinez, California, under the supervision of a Geomatrix geologist. The temporary well borehole was drilled with a hollow stem auger(HSA) rig. The boring was continuously sampled using a 4-foot-long core barrel sampler. A well log was prepared in the field by a Geomatrix geologist following the same procedures as described in Section 3.1 and is included in Appendix A. I:\WPD0CS\4097\ADDLINVB.D0C 5