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n July 27,2001 Project No 2005-2050-01 page 5 • well Neat cement was placed through the hollow stem augers to backfill the boring from the top of the bentonite seal to the ground surface A traffic rated vault box was placed over the well and a watertight locking cap was placed on top of the well casing A well construction diagram for each well is included in Appendix B Since the groundwater monitoring wells were installed adjacent to CPT boring locations, no soil samples were collected during drilling Soil and liquid removed from the boreholes during drilling was placed in DOT approved 55-gallon steel drums and stored on site pending disposal A waste composite sample was collected from the soil cuttings and chemically analyzed to determine an appropriate disposal method A Stratus representative developed monitoring wells MW-10, MW-11, and MW-12 on May 10, 2001 using a surge block followed by groundwater pumping Field data sheets associated with well development are presented in Appendix C Approximately 21 5 feet and 18 6 feet of sediment were removed from monitoring wells MW-10 and MW-11, respectively during development 167dtc ring reeliiVLW-3��as-measured=to-have�:a_to_tal j depth of-28-9meet-fpllbwing-development=The well:dikely-hhass cementanside of the well scree{installe�ic from appxaximi0-Onto-U 5�,feek;bgs) Stratus returned to the site on May 18, 2001 to collect groundwater samples from monitoring wells MW-1 through MW-12 Monitoring weILMW=3_was-found-to-have-an-obstruction_at--approximately-18 feet-bgs-and was not sampled Purged groundwater was placed in DOT approved 55- gallon steel drums and stored on site pending disposal Hunter Surveying Inc of Orangevale, California surveyed the top-of-well-casing elevations for the newly installed monitoring wells and the nine previously installed monitoring wells CPT boring locations and other site features were also surveyed Elevations were surveyed to an accuracy of 0 01 foot vertical, established from City of Stockton benchmark 167, elevation 18 61 feet above mean sea level The newly installed groundwater monitoring wells will be incorporated into the quarterly groundwater monitoring program The results of the monitoring event, including depth to water measurements, subjective evaluations, and laboratory results for each well will be presented quarterly SITE GEOLOGY AND HYDROGEOLOGY Silt and clay are predominately present from 0 to 100 feet bgs at the site Sand was logged by CPT from 15 to 35 feet bgs at boring CPT-1 This sand was not logged at boring CPT-11 and was logged from 35 to 38 feet bgs at boring CPT-10 Sand was also logged from approximately 45 to 65 feet bgs at borings CPT-3, MW-3, and MW-1 Sand was logged from approximately 85 to 90 feet bgs in the northern portion of the study area (CPT-1, CPT-7, CPT-10, CPT-11, CPT-13, and MW-8) and appears to be laterally continuous C 1Prolect Files\Apache Plastics\Reports\Apache Soil&GW 072001A doc