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P Environmental Assessment Report 1 Chevron U.S.A. Products Company, 139 South Center Street.Stockton CA January 25 19% 1.0 INTRODUCTION This report is submitted by Groundwater Technology, Inc. to summarize the methods and results of additional environmental assessment work conducted on November 29 - December 1, 1996, at the Chevron Service Station Number 9-0057 located at 139 South Center Street, Stockton, California (Figure 1). All work was conducted in accordance with Groundwater Technology's Work Plan for Additional Soil and Groundwater Assessment, dated October 19, 1994, and approved by the San Joaquin Public Health Services, Environmental Health Division (EHD). This work included conducting a background review of the site and immediate vicinity, obtaining necessary permits, developing a health and safety plan for field activities, drilling and sampling four soil borings, obtaining "grab"groundwater samples from two borings, installation and development of a groundwater monitoring well in one of the borings, and preparation of this report. 2.0 ADDITIONAL ASSESSMENT WORK 2.1 Background Review/Permitting/Site-Specific Health and Safety Plan Groundwater Technology conducted a technical review of all relevant information available prior to proceeding with site assessment work. Drilling/monitoring-well-installation permits were obtained from the San Joaquin County EHD. An encroachment permit was obtained from the State of California Department of Transportation (CalTrans) to facilitate installation and monitoring of groundwater monitoring well MW-7. Copies of the permits are included in Appendix A. Following a complete review of site conditions, Groundwater Technology prepared a site-specific Health and Safety Plan as required by the Occupational Safety and Health Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response"guidelines (29 CFR 1910.120). The document was reviewed and signed by all Groundwater Technology personnel and subcontractors prior to commencement of work at the site. 2.2 Soil Borings On November 29, 1995, Groundwater Technology supervised the drilling of soil boring S13-7 to a depth of 36.5 feet below ground surface (BGS) utilizing a truck-mounted drill rig equipped with 8-inch outside- diameter (O.D.) hollow-stem augers. On November 30- December 1, 1995, Groundwater Technology supervised the drilling of soil borings MW-7, SB-6 and SB-9 to depths of 45.5 to 51.5 feet BGS using a limited-access drill rig equipped with 5.75-and 8-inch O.D. hollow-stem augers. All drilling equipment was steam cleaned prior to drilling each boring, and sampling equipment was washed in an Alconox (detergent) solution and rinsed with water between sampling intervals. All soil generated from the 0068 EAR,,pt tChv641 Ir-^ GRoiJ [��JaTER I 7___I TECHNOLOGY