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Tt Environmental Assessment Report I Chevron U S A Products Company,508 Charter Way,Stockton, CA May 11 1995 10 INTRODUCTION This report is submitted by Groundwater Technology, Inc to summarize the methods and results of additional environmental assessment work conducted on March 15, 16 and 23, 1995, at Chevron Service Station Number 9-2033 located at 508 Charter Way, Stockton, California (Figure 1) All work was conducted in accordance with Groundwater Technology's Work Plan for Soil and Groundwater Assessment, dated November 11, 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 sod bonngs, installing and developing a groundwater monitoring well in three 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 A drilling/mondoring well Installation permit was obtained from the San Joaquin County EHD A copy of the permit is 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 Bonngs On March 15 and 16,1995, Groundwater Technology supervised the drilling of soil borings MWA , MW -2 and MW -3 to a depth of 51 5 feet below ground surface (BGS), and SBA to a depth of 36 5 feet BGS utilizing a truck -mounted drill ng equipped wdii 8 -inch outside -diameter (O D) hollow -stem augers All drilling equipment was steam cleaned pnor to drilling each boring, and sampling equipment was washed in an Alconox (detergent) solution and rinsed with water between sampling intervals All sod generated from the boring was placed on and covered wrth plastic sheeting and temporarily stored onsite Soil was removed from the site on April 24, 1995 by Integrated Wastestream Management, Inc (IWM) and disposed of at the Browning -Ferns Industries landfill in Livermore, California • 0071 EAR rprlChr I OW `111 W l.rl�Vv�vDv7ir-�, ril� ❑❑❑ TECHNw)GY