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AIL <br /> ' k'q KLEINFELDER <br /> 4 ACTIVITIES CONDUCTED <br /> l <br /> Klemfelder obtained boring/well permits from the San Joaquin County Public Health Services <br /> Department, Environmental Health Division (PHS/EHD) One exploratory soil boring was <br /> I advanced through the estimated central portion of a former UST at the subject site The boring <br /> was advanced to a maximum depth of approximately 18 '/2 feet bgs During the advancement of <br /> the soil boring, Kleinfelder collected soil samples for logging purposes, field screening and <br /> potential chemical analysis The soil boring was advanced using 8-inch outside diameter hollow <br /> stem auger A temporary monitoring well was installed in the boring Chemical analysis was <br /> subsequently conducted on a total of four soil samples and one groundwater sample <br /> 4.1 PRE-FIELD ACTIVITIES <br /> A workplan and a Well/Boring Permit Application was submitted to the San Joaquin County <br /> Public Health Services Department, Environmental Health Division (PHS/EHD) for review and <br /> approval Approved well/bonng pen-nits were obtained prior to initiating the field activities For <br /> a copy of the permits,please refer to Appendix C <br /> 42 FIELD ACTIVITIES <br /> On November 5, 1998, a single temporary monitoring well (B1/TW-1) was installed near the <br /> estimated central portion of a former UST (Plate 2) First groundwater was encountered at about <br /> 16 feet bgs The final measurement of groundwater was noted approximately 14 feet bgs The <br /> temporary monitoring well was installed using a truck-mounted drill rig equipped with 8-inch <br /> hollow stem augers During advancement of the boring for the temporary well, soil samples <br /> were collected at 5-foot intervals beginning at 7 feet bgs <br /> To provide a qualitative indication of the presence of volatile organic constituents in the soil and <br /> to monitor the constituent concentrations in the breathing zone, a portable organic vapor analyzer <br /> was used to screen the samples in the field A Photovae MicroTip' photo-ionization detector <br /> (PID) was used to measure total ionizable compounds in parts per million by volume (ppmv) of <br /> vapor <br /> 1 Soil samples obtained were screened in the field, and the PID readings were recorded on the <br /> boring logs No unusual odors or discoloration was noted in the soil samples collected from <br /> boring B1/TW-1 PID readings for the samples collected ranged from 4 0 to 30 ppmv The PID <br /> readings were progressively higher with increasing depth This highest PID reading for the 7 <br /> foot sample was 7 0 ppmv, while the highest readings for the 12 and 17 foot bgs sample was 21 <br /> and 30 ppmv, respectively <br /> 20-1311-40 E01/201911039 Page 5 of 13 <br /> ©1999,Klemfelder, Inc January 20, 1999 <br />