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' 24 March 2004 <br /> AGE-NC Project No 97-0301 <br /> ' Page 5 of 7 <br /> ' 2 6 WELL ELEVATION SURVEY <br /> On 26 September 2003, a state of California state-licensed survey engineer from Mid Coast <br /> ' Engineers(MCE) surveyed a reference point on the top of the well casing of wells MW-8 through <br /> MW-12 to the nearest 0 01-foot relative to known City of Stockton Bench Mark No 259 <br /> Additionally, MCE utilized GPS techniques to Identify latitude and longitude for tracking wells <br /> MW-8 through MW-12 on the State Water Resources Control Board (SWRCB) GeoTracker <br /> database system The results of the monitoring well survey are contained in Table 1 The surveying <br /> report (MCE Job No 03224) is presented in Appendix D <br /> 3.0. FINDINGS <br /> ' Soil descriptions from MW-8, MW-9, MW-10 and MW-12, supplemented with soil data from <br /> previous site investigations, were utilized to construct geologic/hydrostratigraphic cross sections <br /> ' D-D'and F-F' <br /> ' . 31 SOIL DISTRIBUTION <br /> Based on observations of soil data collected from MW-8, MW-9, MW-10 and MW-12 <br /> (Appendix B),very stiff to hard, fine-grained, sandy, clayey SILT was generally observed between <br /> surface grade and 35 feet bsg, 50 and 60 feet, 80 and 90 feet and 100 and 110 feet bsg,dense to very <br /> dense,poorly graded,fine to medium SAND/silty SAND was generally observed at depths between <br /> 35 and 50 feet bsg, 60 and 80 feet bsg, 90 and 100 feet bsg and'110 and 125 feet bsg <br /> ' The boring logs are Included in Appendix B Soil data collected from wells MW-8 through MW-12 <br /> are depicted on cross sections D-D'and F-F'(Figures 3 and 4, respectively) <br /> 32 FIELD EVIDENCE OF HYDROCARBON-IMPACTED SOIL <br /> ' Petroleum hydrocarbon odors were noted in soil samples collected from MW-8 at depths between <br /> 10 and 55 feet bsg, PID field measurements were noted at depths between 10 and 40 feet bsg at <br /> concentrations as high as 78 parts per million(ppm) <br /> Petroleum hydrocarbon odors were noted in soil samples collected from MW-12 at depths between <br /> 40 and 55 feet bsg, PID field measurements were noted at depths between 90 and 100 feet bsg at <br /> ' concentrations as high as 1 ppm Hydrocarbon odor observations are recorded on the boring logs <br /> contained in Appendix B <br /> Advanced GeoEnvironmental,Inc <br /> I <br />