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• UST Removal and Soil Sampling Report
<br />Page 2 of 4
<br />' On March 4, 2014, the USTs were removed from the subsurface. Prior to removal, the LEL of
<br />each tank was measured in the presence of the City of Stockton Fire Marshall. Once cleared by
<br />' the Fire Marshall, the following USTs and associated product lines were removed from the
<br />subsurface:
<br />' The USTs were removed from the subsurface using a large crane and were stored on site,
<br />secured on risers on top of visqueen plastic sheeting, pending destruction and proper disposal.
<br />All eight of the USTs were constructed of doubled walled fiberglass and were in good condition
<br />' upon removal. After the removal of the USTs and the subsequent soil sampling the UST pits
<br />were backfilled with the stockpiled soil. Additional soil was added, as necessary, to backfill the
<br />excavations to grade. The locations of the former USTs can be seen on the site plan included as
<br />' Figure 2.
<br />Soil Sampling
<br />On March 4, 2014, Ground Zero Geologists Joe Vasquez and Andrew Dom collected soil samples
<br />from beneath the former USTs and associated piping to investigate the presence or lack thereof of
<br />' contamination beneath the tanks. EHD personnel was on site to observe and direct soil sampling
<br />activities.
<br />' Three soil samples per tank were collected beneath Tanks #1, 2, 3 and 4; one soil sample from
<br />beneath each end and one from the center of each tank. Two soil samples per tank were collected
<br />beneath Tanks #5, 6, 7 and 8; one soil sample from beneath each end. Two soil samples were
<br />collected beneath the former dispenser island and product lines associated with Tanks #1, 2, 3, 4,
<br />5 and 6. Nine soil samples (one every 20 feet) were collected beneath the product lines
<br />associated with the motor oil tanks (Tanks #7 and 8). The soil samples collected from beneath
<br />' the USTs were all collected out of the bucket of the excavator and the soil samples collected
<br />beneath the dispenser and product lines were collected using a drive sampler. In addition, one
<br />4:1 composite soil sample was collected from each 50 cubic yards of stockpiled soil. The soil
<br />samples were all collected into clean stainless steel tubes. The tubes were sealed with Teflon®
<br />tape, capped, uniquely labeled, and stored in an ice chest refrigerated to a temperature of
<br />' approximately 4° C, pending transportation to the laboratory. The soil samples were sent, under
<br />chain -of -custody protocol, to Argon Laboratories ([Argon] ELAP #2359) of Ceres, California for
<br />analysis.
<br />GADam\GROUNDMStockton RTD\Reporls\UST Removal and Soil Sampling Report.docx
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<br />Tank #1, 20,000 gallon diesel;
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<br />Tank #2, 20,000 gallon diesel;
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<br />Tank #3, 20,000 gallon diesel;
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<br />Tank #4, 20,000 gallon diesel;
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<br />Tank #5, 1,000 gallon unleaded gasoline;
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<br />Tank #6, 1,000 gallon automatic transmission fluid (ATF);
<br />Tank #7, 6,000 gallon motor oil;
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<br />Tank #8, 6,000 gallon used motor oil;
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<br />Dispenser island and piping associated with Tanks #1, 2, 3, 4, 5 and 6;
<br />'
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<br />Product lines (approximately 120 feet) associated with Tanks #7 and 8.
<br />' The USTs were removed from the subsurface using a large crane and were stored on site,
<br />secured on risers on top of visqueen plastic sheeting, pending destruction and proper disposal.
<br />All eight of the USTs were constructed of doubled walled fiberglass and were in good condition
<br />' upon removal. After the removal of the USTs and the subsequent soil sampling the UST pits
<br />were backfilled with the stockpiled soil. Additional soil was added, as necessary, to backfill the
<br />excavations to grade. The locations of the former USTs can be seen on the site plan included as
<br />' Figure 2.
<br />Soil Sampling
<br />On March 4, 2014, Ground Zero Geologists Joe Vasquez and Andrew Dom collected soil samples
<br />from beneath the former USTs and associated piping to investigate the presence or lack thereof of
<br />' contamination beneath the tanks. EHD personnel was on site to observe and direct soil sampling
<br />activities.
<br />' Three soil samples per tank were collected beneath Tanks #1, 2, 3 and 4; one soil sample from
<br />beneath each end and one from the center of each tank. Two soil samples per tank were collected
<br />beneath Tanks #5, 6, 7 and 8; one soil sample from beneath each end. Two soil samples were
<br />collected beneath the former dispenser island and product lines associated with Tanks #1, 2, 3, 4,
<br />5 and 6. Nine soil samples (one every 20 feet) were collected beneath the product lines
<br />associated with the motor oil tanks (Tanks #7 and 8). The soil samples collected from beneath
<br />' the USTs were all collected out of the bucket of the excavator and the soil samples collected
<br />beneath the dispenser and product lines were collected using a drive sampler. In addition, one
<br />4:1 composite soil sample was collected from each 50 cubic yards of stockpiled soil. The soil
<br />samples were all collected into clean stainless steel tubes. The tubes were sealed with Teflon®
<br />tape, capped, uniquely labeled, and stored in an ice chest refrigerated to a temperature of
<br />' approximately 4° C, pending transportation to the laboratory. The soil samples were sent, under
<br />chain -of -custody protocol, to Argon Laboratories ([Argon] ELAP #2359) of Ceres, California for
<br />analysis.
<br />GADam\GROUNDMStockton RTD\Reporls\UST Removal and Soil Sampling Report.docx
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