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Ms Margaret Lagorio Project No 880-040 IA November 8, 2002 Page 5 30 feet bgs to the total depth of 54 feet bgs to provide a complete lithologic description of subsurface conditions An aquitard was encountered at 54 feet bgs and the boring was terminated to avoid compromising any lower aquifer Three soil samples from the deep boring were submitted to the laboratory for the analysis of TPHg by EPA Method 8015, and BTEX and the five oxygenates by EPA ' Method 8260B The soil sample collected at 15 feet bgs was also analyzed for lead by EPA Method 6010 DPE and Feasibility Testing Prior to conducting the DPE event, Shaw E & I submitted a letter of notification to the San Joaquin Valley Unified Air Pollution Control District A copy of the notification and agency response is included in Attachment A The DPE was conducted from the morning of June 10 through the morning of ' June 15, 2002, by TRC Alton Geoscience, Inc The DPE was conducted by simultaneously extracting soil vapor and groundwater from well MW-1 The DPE test ' was performed utilizing a mobile treatment system Mayor features of this mobile treatment unit include • A 20-horsepower (hp) liquid ring pump capable of achieving vacuum up to 29 inches of mercury (Hg) • A 300-gallon air and water separator vessel The water from the separator vessel is automatically pumped to a 21,000-gallon holding tank for future disposal The vapor stream is abated via the onboard thermal oxidizer ' • A 350-standard cubic feet per minute (scfm) propane-fired thermal oxidizer with a minimum volatile organic compounds (VOC) destruction efficiency rate of 99 percent Data collection during testing included the following • Vapor flow rate was measured with a hot wire anemometer, ' N lrandpl\Projects\Projects1880104041a1Q1101Assessment and Interim Remedial Report doc