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i I10 May 2004 • AGE-NC Project No 96-0229 Page 5 of 8 valve water tip through each specific water-charged screened section A Watera-Hydro-Lift IT pump equipped with a mechanical arm was utilized to surge the polyethylene hose I Prior to well development, depth to water and total depth measurements were collected from each screened interval utilizing a Solinst water level Indicator Thereafter, ground water was evacuated (purged) from the bottom of each monitoring well screened interval until ground water was visually sediment free Approximately 1 to 10 gallons of water were purged from the multi-level monitoring wells during development Temperature,pH and conductivity of purged groundwater were measured at regular Intervals utilizing an Oakton water analyzer Purged groundwater was containerized at the I site in properly labeled DOT-approved model 17H 55-gallon drums Copies of monitoring well field logs for development activities are in Appendix C I2 6 WELL ELEVATION SURVEY On 24 March 2004,a state of California state-licensed survey engineer from Morrow Surveying Land Surveyors(MSLS)surveyed a reference point on the top of the well casing of wells MW-13 through • MW-19 to the nearest 0 01-foot relative to known City of Stockton Bench Mark Datum No 15 Additionally, MSLS utilized GPS techniques to identify latitude and longitude for tracking wells MW-13 through MW-19 on the State Water Resources Control Board (SWRCB) GeoTracker database system The results of the monitoring well survey are contained in Table 1 The surveying report (MSLS Job No 0114-019) is presented in Appendix D 3.0. FINDINGS I Soil descriptions from MW-13,MW-14 and MW-16 through MW-19, supplemented with soil data from previous site investigations, were utilized to construct geologic/hydrostratigraphic cross sections B-B'and F-F' 3 1 SOIL DISTRIBUTION Based on observations of soil data collected from MW-13, MW-14 and MW-16 through MW-19 (Appendix B), medium dense to dense, silty, fine grain SAND and poorly graded, fine to medium grain SAND were generally observed at depths between 15 feet and 45 feet bsg,between 70 and 95 feet bsg and at depths greater than 115 feet bsg, very stiff to hard, fine sandy, clayey SILT and silty CLAY was generally observed at depths less than 10 feet bsg, between 50 and 65 feet bsg and between 100 and 110 feet bsg • Advanced GeoEnvi ron men tal,Inc I