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ER1 205503 R01 Unocal Smicc Station 5886 Stockton California lune 3 1997 performed under the guidance of an ERI geologist who collected soil samples from the borings during drilling Soil samples were collected at approximately 5-foot intervals and dust above first- encountered groundwater ERI'S geologist identified the soil samples collected from borings B4 through B7 using visual and manual methods, and classified the samples using the Unified Soil Classification Systems (Appendix D) Descriptions of the materials encountered in these borings are presented in the Logs of Borings (Appendix D) Soil borings B4 through B7 were drilled to approximately 25 to 28 feet bgs Cuttings generated during drilling were stockpiled on site and covered with plastic sheeting pending appropriate disposal Manley and Sons Trucking of Sacramento, California transported the cuttings at the site to Forward Landfill of Manteca, California for disposal Disposal documentation is attached (Appendix E) 34 Monitoring Well Construction, Development, Sampling., and Surveying Woodward constructed duel completion monitoring wells MW4S through MW7S and MW4D through MW7D in borings B4 through B7, respectively Mr Ron Rowe of SJCPHS was on site during construction of dual completion wells MW4 and MW5 Details of the monitoring well construction are shown on the Logs of Borings (Appendix D) On April 25, 1997, an ERT technician developed wells MW4S through MW7S and MW4D through MW7D using surging and pumping techniques ERI contracted Ron Archer Civil Engineering, Inc of Pleasanton, California (a licensed surveyor) to survey the wells and provide the location and elevation of each wellhead relative to mean sea level On May 2, 1997, MPDS measured depth to water (DTW) and collected and submitted groundwater samples from the newly installed and existing wells during second quarter 1997 groundwater monitoring . 4