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Ms.Margaret Lagorio • • <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> May 6, 1997 <br /> Page 3 <br /> Boring Number Rationale <br /> SB-1 Near area of dead vegetation near the northeast comer of <br /> property <br /> SB-2 and SB-3 Near former location of concrete batch plant (one boring <br /> at the location of previous aboveground storage tank) <br /> SB-4 South of the former concrete batch plant (unpaved area <br /> where waste water from rinsing concrete trucks was <br /> allowed to drain) <br /> SB-5 East of existing wood building(where trash and water-filled <br /> 55-gallon drums were observed during Phase I) <br /> SB-6 Near the existing cargo container and septic tank <br /> SB-7 and SB-8 Near former location of auto body and paint shop <br /> At boring locations where concrete is present at the ground surface,concrete coring equipment will be used <br /> to core through the concrete and provide access to the underlying soil. Soil borings will be advanced using <br /> portable soil coring equipment, where feasible. Soil borings will be advanced to five feet below first <br /> encountered groundwater(15 to 20 feet). Following completion,borings will be backfilled to the surface with <br /> cement grout and the surface finish patched to match existing conditions (i.e., asphalt or concrete). <br /> Wastes generated during soil boring advancement will include a small amount of excess soil cuttings, rinse <br /> water from decontamination, and possibly,purge water from the domestic water well. These wastes will be <br /> placed in appropriate containers,labeled and stored at a pre-approved onsite location. The disposition of these <br /> wastes will be determined on the basis of the analytical testing results described below and therefore, a cost <br /> for disposition has not been included in the cost estimate. <br /> Soil Sampling and Analysis <br /> During advancement of the soil borings,relatively undisturbed soil samples will be collected for lithologic <br /> description and possible chemical analysis. Soil samples will be collected within clean brass tubes. <br /> Representative soil samples will be screened in the field for the presence of volatile organic compounds using <br /> a Photoionization Detector(PID). Based on visual observations and PID screening, a minimum of one soil <br /> sample from each boring will be selected for chemical analysis. SECOR will submit the selected soil samples <br /> to a California state-certified testing laboratory for analysis of total petroleum hydrocarbons as gasoline and <br /> diesel (EPA Method 8015, modified), oil and grease (Standard Method 5520 E&F), volatile organic <br /> compounds (EPA Method 8240), and priority pollutant metals (EPA Method 6000/7000 series). These <br /> analytes have been selected based on common chemical use practices for the types of businesses which <br /> previously occupied portions of the Site. <br /> HAKA15 ERW ANTECAWANTECA.W P <br />