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Soil Boring and Monrtonng Well Installation Report Page 2 Ranch Market Riverbank,CA September G 2000 • 3.0 PERMITTING/SITE-SPECIFIC HEALTH AND SAFETY PLAN Following a complete review of site conditions, SECOR 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 SECOR personnel and subcontractors prior to commencement of work at the Site Soil boring and well installation permits were obtained from the SJCEHD An encroachment permit was obtained for one GeoprobeTm boring in the County right-of-way in front of the Ranch Market Store from San Joaquin County Copies of these permits are included in Appendix A Underground Service Alert was contacted at least 48 hours prior to conducting the field work A private utility locator was also used to delineate potential underground lines and further define the locations of the current septic tanks at the Site and adjacent properties Prior to conducting the field work, SECOR also secured access agreements from four parcel owners where offsite bonngs and/or groundwater monitoring wells were to be drilled Copies of the access agreements secured from the three property owners are included in Appendix A 4.0 SOIL BORINGS,SAMPLING, AND WELL INSTALLATION • 4.1 Soil Borings On July 17 and 18, 2000 SECOR supervised the drilling of 4 GeoprobeTM soil borings (GP-1, GP-2, GP-3, and GP-4) to depths ranging from approximately 32 to 45 feet below ground surface (bgs) On July 24 and 25, 2000 SECOR supervised the drilling of 2 continuous core borings (SB-1 and SB-2) to approximately 75 feet bgs On August 8 through 11, 2000 SECOR supervised the drilling of five soil borings (MW-5, MW-6, MW-7, MW-8, and MW- 9) to a depth of approximately 40 feet bgs, one boring (MW-5d) to a depth of 70 feet bgs, and one boring (SB-3) to 35 feet bgs using a truck-mounted HSA drill ng equipped with 8-inch outside-diameter (O D ) augers Well completion details are presented on Table 1 The locations of all 13 soil borings are shown on Figure 2 In soil borings SB-1 and SB-2, a 5-foot continuous core barrels was used to retrieve soil for lithologic description, field photo-ionization detector(PID) measurements, and to retain soil samples for laboratory analysis at five foot intervals With the exception of SB-1 and SB-2, if soil samples were not previously collected nearby, samples were collected at five-foot intervals for lithologic description, PID measurements, and for collection of select soil samples to be submitted for laboratory analysis (Table 4) Note that not all soil borings were used to collect both soil and groundwater samples, as several were relatively close to an existing boring and "duplicate" samples were not needed All down-hole drilling equipment (augers, push rods, etc ) were steamed cleaned between each soil boring and the soil sampling equipment was cleaned and rinsed following collection File R-WcIIInstall&M&S rpt doe SECOR International Incorporated