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02 December 1998 AGE-NC Project No. 98-0463 Page 3 of 5 assurance/quality control (QA/QC) reports, and sample chain of custody documentation were presented in the Phase I reportwith the findings and recommendations. This report was prepared for submission to the Public Health Services-Environmental Health Division (PHS-EHD) of San Joaquin County. 4.0. PROCEDURES Prior to conducting the field work, a work plan and a site-specific health and safety plan were prepared by AGE and submitted to the San Joaquin County Public Health Services-Environmental Health Department(PHS-EHD) for approval, which was granted. AGE also procured the permits required to advance the boreholes. Five exploratory borings were advanced on the property to assess ground water for metals, chlorinated pesticides and semi-volatile organic compounds. The field work was conducted on 13 and 14 August 1998. One so�ga be boring (probing) was advanced on 13 August and four were advanced on 14 August uti Izeopro a 5400 direct push soil sampling machine. Grab ground water samples were collected from each probe boring, no soil samples were collected. Additional sample was collected from one sampling point on 25 August 1998.Z Advancement of soil probe borings was accomplished utilizing AGE's van-mounted Geoprobe 5400, equipped with 1.125-inch diameter probe rods with an attached 2.15-inch diameter soil sampler. Ground water was encountered in each probe boring at a depth of approximately 16.5 feet bsg. Grab ground water samples were collected from each soil probe boring at a depth of 20 feet bsg using 10 feet of a temporary PVC screen and 10 feet of a temporary PVC blank casing. The probe rods were advanced four feet into the ground water, pulled out, and a screened casing was inserted into the saturated zone. Ground water was allowed to enter the casing, and samples were retrieved using a modified PVC tubing bailer utilizing a Geoprobe water sampling assembly. Upon collection,ground water samples were transferred into three 40-m1 EPA-approved VOA vials containing 0.5 ml 18% hydrochloric acid as a preservative, and into a one-liter amber bottle without preservation. Each sample container was labeled with the location, time, date and sampler's initials. The samples were logged on a chain-of-custody form, stored in a chilled container and transported under chain-of-custody to a McCampbell Analytical Inc. (MAI) a DTSC-certified laboratory. The grab water samples were analyzed in accordance with: EPA Methods 6010/200.7; 7470/7471/245.5; 7060/206.2; 7740/270.2; and 7841/279.2 for the CAM/CCR 17 metals, and 608 and 3510 or 8080 and 3550 for chlorinated pesticides (including PCBs). Additional sample was needed to conduct an EPA Method 8270 analysis for semi-volatile organic compounds,and was acquired on 25 August 1998. The grab ground water sample was acquired by advancing a 3-inch hand auger boring three feet into the saturated zone and inserting a 2-inch '' Advanced GeoEnviron mental,Inc.