|
The site is situated within the Eastern San Joaquin Subbasin of the larger San Joaquin Valley '
<br /> Groundwater Basin. The Eastern San Joaquin Subbasin is comprised of unconsolidated continental '
<br /> deposits, alluvium,flood-basin deposits, and lacustrine and marsh deposits with cumulative thicknesses of
<br /> a few tens to a few hundreds of feet. Primary groundwater-containing formations in the Eastern San
<br /> Joaquin Subbasin include alluvium and the Riverbank/Modesto Formation, flood basin deposits, Laguna
<br /> Formation, and Mehrten Formation. Shallow groundwater in the site vicinity is reportedly encountered at '
<br /> depths ranging from 35 to 45 feet bgs. Groundwater gradient in the site vicinity has been mapped north-
<br /> northwesterly.
<br /> 3.0 FIELD INVESTIGATION '
<br /> On 19-Jul-2012, six direct-push soil borings were advanced at the site. The site was cleared for '
<br /> underground utilities by Underground Service Alert for Northern California. Prior to conducting field
<br /> investigation activities,the presence of underground utilities was further inspected and these areas marked
<br /> on the ground surface. Ms. Buffie Choumos of EarthTouch, Inc. performed soil logging, sample
<br /> collecting, and boring abandonment activities. At each location the soil samples were collected using a '
<br /> direct-push drill rig operated by Cascade Drilling, LP of Richmond, California. Mr. Johnny Yoakum of
<br /> the San Joaquin County Environmental Health Department(EHD) was present on site for the majority of
<br /> the field investigation activities. '
<br /> 3.1 Direct-Push Soil Borings and Sampling
<br /> Soil samples were continuously collected using a two-inch diameter direct push-sampling probe; the '
<br /> sampling probe was lined with disposable liners; soil samples were collected in the liners, which were
<br /> then removed from the probe and opened for review of the soil. Collected soil samples were physically
<br /> inspected, logged, and examined for visual and olfactory evidence of impact. Groundwater was not '
<br /> encountered in any of the borings advanced at the site during the LSI. Soil sample depths were
<br /> determined by the physical inspection of each boring as it advanced through the subsurface as specified
<br /> below. '
<br /> • B1-S1: Soil sample collected at roughly 4 to 6 feet bgs (analyzed for VOCs, RCRA 8 Metals,
<br /> TPH-DRO,and TPH-GRO); '
<br /> • BI-S2: Soil sample collected between roughly 13 to 14 feet bgs (VOCs, RCRA 8 Metals, TPH-
<br /> DRO, and TPH-GRO);
<br /> • B2-Sl: Soil sample collected between roughly 8 to 10 feet bgs (VOCs, TPH-DRO, TPH-GRO,
<br /> and PCBs); '
<br /> • B2-S2: Soil sample collected between roughly 13 to 15 feet bgs (VOCs, TPH-DRO, TPH-GRO,
<br /> and PCBs);
<br /> • B3-Sl: Soil sample collected between roughly 6 to 8 feet bgs (VOCs, TPH-DRO, TPH-GRO, '
<br /> and PCBs);
<br /> • B3-S2: Soil sample collected between roughly 9 to 11 feet bgs (VOCs, TPH-DRO, TPH-GRO,
<br /> and PCBs); '
<br /> • B3-S3: Soil sample collected between roughly 14 to 15 feet bgs (VOCs, TPH-DRO, TPH-GRO,
<br /> and PCBs);
<br /> • B4-S1: Soil sample collected between roughly 5 to 7 feet bgs (VOCs, TPH-DRO, TPH-GRO, ,
<br /> and PCBs);
<br /> • B4-S2: Soil sample collected between roughly 12 to 14 feet bgs (VOCs, TPH-DRO, TPH-GRO,
<br /> and PCBs);
<br /> • B5-Sl: Soil sample collected between roughly 6 to 8 feet bgs (VOCs, TPH-DRO, TPH-GRO, '
<br /> and PCBs);
<br /> Limited Subsurface Investigation ,
<br /> (J&D Trust)J&D Auto Body 5 flUC
<br /> 1011 Cherokee Lane, Lodi, California
<br />
|