Laserfiche WebLink
Q <br /> Limited Phase 11 Subsurface Investigation Report <br /> Property Lease Port of Stockton <br /> Stockton,California a ntea g ro u p <br /> Antea Group Project No. UPR8298B <br /> ranging from two feet to seven feet below ground surface (bgs), depending on the location. See the below table <br /> for total explored boring depths. <br /> Boring Name Total explored depth(in Boring Name Total explored depth <br /> feet bgs) (in feet bgs) <br /> B-1 5.0 B-15 5.0 <br /> B-2 6.0 B-16 6.0 <br /> B-3 6.0 B-17 6.0 <br /> B-4 5.0 B-18 7.0 <br /> B-5 6.0 B-19 4.0 <br /> B-6 6.0 B-20 4.0 <br /> B-7 4.0 B-21 4.0 <br /> B-8 2.0 B-22 6.0 <br /> B-9 6.0 B-23 6.0 <br /> B-10 2.0 B-24 3.0 <br /> B-11 6.0 B-25 6.0 <br /> B-12 2.0 B-26 4.0 <br /> B-13 7.0 B-27 5.0 <br /> B-14 6.0 B-28 4.0 <br /> For the advancement of locations B-6, 13-7, and B-18, a direct-push drill rig with a 2-inch diameter macro-core <br /> sampler (equipped with a 4-foot acetate liner) was used to advance to the maximum depth of each boring due to <br /> difficult hand-auger conditions. Antea Group field-screened the soils from each borehole for the presence of <br /> volatile organic compounds (VOCs) using a photo ionization detector (PID) calibrated to 100 parts per million <br /> (ppm) by volume isobutylene. Antea Group visually described and classified soils continuously from each borehole <br /> according to the Unified Soil Classification System (USCS). Field observations were recorded on boring logs <br /> included in Appendix B. <br /> Upon completion, boreholes were backfilled to within 1 foot bgs using Portland cement and capped with native <br /> soil to match existing surface conditions. To prevent cross-contamination, Cascade decontaminated all down-hole <br /> equipment prior to the advancement of each subsequent soil boring. <br /> 3.3 Soil Sampling <br /> Antea Group chose the soil sampling locations and depths in areas of planned construction/excavation where data <br /> gaps existed for shallow soil. Samples were collected from the selected areas to provide baseline analytical data <br /> prior to the property lease and to evaluate analyte concentrations in the context of trench worker safety. Field <br /> personnel collected soil samples directly from the hand auger or disposable acetate liners into laboratory-supplied <br /> glass soil jars with Teflon 9-lined lids. The jars were labeled with the sampling location, depth, and other details <br /> (e.g., date and time collected), placed in an ice-cooled chest for proper preservation; and then transported to <br /> TestAmerica Laboratories, Inc. in Pleasanton, California, a state-certified laboratory. Each sample was recorded on <br /> 4 www.anteagroup.com <br />