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IProblem Assessment Report Page 5 Ranch Market,23569 South Santa Fe Road,Riverbank CA November S,2000 Given the Stanisluas River and well at Jacob Meyers Park are less than 1000 feet from the Site, a release at the Site to groundwater could potentially have an impact on the domestic ' weIls and the River However, all available evidence suggests no impact to the Park, River, and wells in that area from activities at Ranch Market There are several residences greater than 1700 feet to the north and up-gradient of Ranch Market (Figure 8) These wells north of ' the Site are up-gradient and, therefore, have not been impacted by past activities at Ranch Market No wells were observed within the 2000 foot-radius, south of the Stanisluas River in Riverbank, California 3.0 PERMITTING/SITE-SPECIFIC HEALTH AND SAFETY PLAN ' Soil vapor extraction wells V-1 through V-6 and air sparge well AS-1 were installed using the existing well installation permit for MW-6, originally obtained from the San Joaquin County ' Public Health Services,Environmental Health Division (SJCEHD) for Parcel No 249-070-012 (Appendix A) A SVEIAS feasibility test notification letter was sent to the San Joaquin Valley Air Pollution Control District Copies of the well permits and SJVAPCD letter of ' response are included in Appendix A Underground Service Alert was contacted at least 48 hours prior to conducting the fieldwork ' As required by the Occupational Safety and Health Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910 120), a liesite-specific Health and Safety Plan was reviewed and signed by all SECOR personnel and subcontractors prior to commencement of work at the Site ' 4.0 SOIL BORINGS, SAMPLING, AND WELL INSTALLATION 4.1 Soil Borings On September 21 and 22, 2000, SECOR supervised the drilling of 7 soil borings (AS-1, V-1, ' V-2, V-3, V-4, V-5, and V-6) to depths ranging from approximately 30 to 50 feet below ground surface (bgs) using a truck-mounted HSA drill rig equipped with 8-inch outside- diameter(O D ) augers Well completion details are presented on Table 2 The locations of the seven soil borings are shown on Figure 3 Soil samples were collected at selected depth intervals for lithologic description, field photo- ionization detector(PID) measurements, and to retain soil samples for laboratory analysis In soil boring AS-1, samples were collected at five-foot intervals, except at 30, 40, and 45 feet bgs In V-1 and V-2, samples were collected at 20, 25, and 30 feet bgs In V-3, samples were I collected at 15, 20, and 30 feet bgs Due to the close well spacing, no samples were collected in borings V-4, V-5, and V-6 I 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 of each soil sample The drill cuttings were placed on visqueen and stored at the Site pending File PAR-report doc SECOR International Incorporated