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URS Mr Harlin Knoll Page 4 San Joaquin County Environmental Health Department May 19, 2003 Soil cuttings and wastewater generated dunng the drilling activities were placed in labeled 55-gallon Department of Transportation (DOT)-approved steel drums and stored on-site, pending disposal A composite soil sample was collected from the soil cuttings and submitted to Sequoia Analytical Laboratory in Sacramento, California, for analysis of TPHg, benzene, toluene, ethylbenzene, and xylenes (BTEX), and total lead On March 14, 2003 the soil was hauled by Dillard Environmental Services to Republic Services Vasco Road Landfill in Livermore, California, where it was disposed of as non-hazardous waste In addition, Dillard Environmental Services transported 5 drums of ansate water to Romic Environmental Technologies in East Palo Alto, California for disposal Field and laboratory procedures are presented as Attachment B Stockpiled soil laboratory analytical reports are included as Attachment C Waste disposal documentation is presented as Attachment D Groundwater Monitoring Well Development, Surveying and Sampling On April 1, 2003 Blaine Tech Services of Sari Jose, California (Blaine Tech) developed the groundwater monitoring wells by rigorously surging over the length of the screen interval, and by purging approximately 10 casing volumes of water from each well Well development field sheets are presented • as Attachment E On Apnl 10, 2003, Blaine Tech collected groundwater samples from the newly installed groundwater monitoring wells as part of the second quarter 2003 monitoring event Groundwater samples were analyzed for TPHg, BTEX, and MtBE by EPA Method 8015B and 8021B MtBE detections were verified by EPA Method 8260B Attachment B presents detailed groundwater sampling and analysis procedures Well sampling field sheets are presented in Attachment E On March 21, 2003 the wells were surveyed by Morrow Surveying of West Sacramento, California Survey data are included as Attachment F SITE CONCEPTUAL MODEL Subsurface Conditions Soil samples collected during the drilling of MW-5 indicate that a sandy clay layer is present from approximately 5 to 23 feet bgs Alternating layers of sand and silty sand are present from 23 to 60 feet bgs The interval from 60 to 98 feet bgs (the total depth explored) consists pnmarily of silt and clay with the exception of a two-foot layer of silty sand between 68 and 70 feet bgs Well MW-5 was screened was screened across this silty sand layer Soil encountered during the drilling of MW-6 consisted of clay and sandy clay from the surface to 53 feet bgs and saturated well-graded sand from 53 feet to 60 feet bgs At MW-7, clay and sandy clay were • K MprocessV5 BP ARCo1111411Well InstallatioMwell snsWlanon reportO doc