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Table 1
<br /> Proposed Sampling Program and Rationale - -
<br /> Stockton A Substation
<br /> Stockton,California
<br /> Total Depth of Target Soil Sampling Depth
<br /> Proposed Boring ID Boring(feet Analyses Sampling Rationale
<br /> (feet bgs)
<br /> bgs)
<br /> P-1, P-2,P-3,and P-4 10 6 inches oust below aggregate TPH-e,MC, PCBs, Assess soil conditions at transformer hoist; If impacted soil observed,
<br /> base) Metals adjust sample depth to collect most impacted soil in upper 2 feet
<br /> 5 TPH-e,MC,PCBs, If impacted soil observed below 2 feet,adjust sample depth to collect from
<br /> Metals most impacted soil below 2-foot depth; If only soil in 0-2-foot interval appears
<br /> impacted,collect an additional sample just below impacted zone and submit
<br /> sample on HOLD
<br /> 10 TPH-e,MC,PCBs, If impacted soil observed at 10 feet,continue drilling until non-impacted soil is
<br /> Metals encountered; Collect sample below observed impact zone •
<br /> P-5 and P-6 10 6 inches Oust below aggregate TPH-e,MC,PCBs, Assess soil conditions at former oil ASTs;If impacted soil observed,adjust
<br /> base) Metals sample depth to collect most impacted soil in upper 2 feet
<br /> 5 TPH-e,MC,PCBs, If impacted soil observed below 2 feet,adjust sample depth to collect from
<br /> Metals most impacted soil below 2-foot depth; If only soil in 0-2-foot interval appears
<br /> impacted,collect an additional sample just below impacted zone and submit
<br /> sample on HOLD
<br /> 10 TPH-e,MC, PCBs, If impacted soil observed at 10 feet,continue drilling until non-impacted soil is
<br /> Metals encountered; Collect sample below observed impact zone
<br /> P-7, P-8,P-9, P-10, P-11,and P 10 6 inches oust below aggregate TPH-e,MC, PCBs, Assess soil conditions at former Transformer House;If impacted soil
<br /> 12 base) Metals observed,adjust sample depth to collect most impacted soil in upper 2 feet
<br /> 5 TPH-e,MC, PCBs, If impacted soil observed below 2 feet,adjust sample depth to collect from
<br /> Metals most impacted soil below 2-foot depth;If only sail in 0-2-foot interval appears
<br /> impacted,collect an additional sample just below impacted zone and submit
<br /> sample on HOLD
<br /> 10 TPH-e,MC, PCBs, If impacted soil observed at 10 feet,continue drilling until non-impacted soil is
<br /> Metals encountered; Collect sample below observed impact zone •
<br /> Soil Sample from Drum(s) NA TPH-e,MC, PCBs, Collect one composite soil sample from drums)for IDW characterization
<br /> Metals
<br /> Decon Water Sample from NA TPH-e,MC,PCBs, Collect one water sample from drum(s)for IDW characterization
<br /> Drum(s) Metals
<br /> TPH-e=extractable total petroleum hydrocarbons using EPA Method 8015M,quantified into C ranges
<br /> MC=moisture content using EPA Method 160.3
<br /> PCBs=polychlorinated bisphenyls using EPA Method 8082
<br /> Metals=CAM 17 Metals using EPA Methods 601OB17470A
<br /> bgs=below ground surface
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