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I <br /> AUwGERS oESGNERSC66ll1nxi5 <br />' FIELD REPORT <br /> PHASE III SITE INVESTIGATION <br />' SAN JOAQUIN COUNTY - HUMAN SERVICES AGENCY BUILDING <br /> 145 SOUTH SUTTER STREET, STOCKTON, CALIFORNIA <br />' Roy F Weston, Inc. (WFSTON®) performed a Phase III site investigation along with a <br /> quarterly groundwater monitoring event on behalf of San Joaquin County Capitol Projects <br />' (Capitol Projects) at the San Joaquin County Human Services Building at 145 South Sutter Street <br /> in Stockton, California. Phase III was completed during 10 to 12 July 1995 and the groundwater <br /> sampling was performed on 25 to 26 July 1995 <br /> Monitor Well SoiI .Sampling and Installation <br /> Two replacement monitor wells, (MW-2A and MW-3A) were installed to depths of 60.0 and <br /> 57 0 feet below ground surface The wells were completed using a truck-mounted drill rig and <br /> 10-inch diameter hollow stem augers Soil samples for lithologic description and laboratory <br /> analysis were collected at 5-foot intervals using a pre-cleaned split spoon sampler containing <br />' three 6-inch long brass liners. After the split spoon was driven to the appropriate depth, the <br /> sampler was extracted from the borehole and the brass liners removed Soil samples were field <br /> screened using a portable photoionization detector (PID) and the three samples showing the <br /> highest reading from each boring were to be submitted for laboratory analysis. However, two <br />' samples from MW-2A, which had the highest PID reading were not submitted for chemical <br /> analysis. Floating product in the form of beads and sheen, were encountered on groundwater <br /> whale drilling MW-2A The high PID samples, MW-2A-50 and MW-2A-55, were collected <br />' from below the water table and the floating product and, therefore, were not submitted for <br /> analysis PID field screening results are reported on the borehole logs in Appendix. <br /> Four soil samples were collected from MW-2A and three were collected from MW-3A for <br />' laboratory analysis All samples were analyzed for total petroleum hydrocarbons as gasoline <br /> (TPH-G)and diesel (TPH-D)by modified EPA Method 8015 and for BTEX constituents by EPA <br /> Method 8020 All analytical procedures and detection limits met current PHSEHD <br />' requirements <br /> During drilling, split spoon soil samples were lithologically described on logs developed for each <br /> boring The samples were described using standard geologic classifications for color, texture, <br /> 1 <br /> LSPROAECPS\SANJOQM"HME m A-1 29 Auvm i"s <br />