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Page 5 least every 20 feet laterally Samples S-1 through 5-10 were collected to a maximum depth of 13 0 feet using either a stainless steel sampler connected to a 15 foot rod and slide hammer, or the bucket of the excavator according to Standard Operating Procedures in Appendix C Sample collection was witnessed by Ms Linda Turkatte, Registered Environmental Health Specialist, San Joaquin County Environmental Health Department. The pit was excavated to the top of groundwater at approximately 14 5 feet below ground surface Interim remediation of the groundwater included removing 1,800 gallons of groundwater which was pumped by Erickson from the pit on 20 April 1992, prior to filling the tank pit with clean fill The liquid was transported to Gibson Oil/Pilot Petroleum Facility in Redwood City (see Appendix D for the manifest) Soil sampling of the tank pit walls (total often samples, S-1 through 5-10) was performed on 4 April 1992 Soil was excavated to the top of groundwater PUMP ISLAND AREA On 16 and 30 May 1992, 534 cubic yards of soil were excavated from the pump island area The soil was screened and segregated in the field using a PID Artesian documented the soil removal process with field reports and photographs After the removal of soil having obvious staining, odor or detectable levels of organic vapors as detected on a PID, confirmatory soil samples in the walls and floor of the excavation were selected at least every 20 feet laterally Soil samples PI-1 through P1-12 were collected at a depth of 10 0 feet using either a stainless steel sampler connected to a 15 foot rod and slide hammer or the bucket of the excavator according to Standard Operating Procedures in Appendix C Mr Harlin Knoll, Senior Registered Environmental Health Specialist, San Joaquin County Environmental Health Department, witnessed the sample collection Soils were excavated to the top of groundwater at approximately 14 feet below ground surface 1