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t URS Ms. Vickie McCartney,REHS Page 4 San Joaquin County Environmental Health Department February 13, 2004 PERMITTING SJCEHD requires that permits be submitted and approved prior to drilling and installation of monitoring and remediation wells. URS will submit the appropriate permit application(s) with fees to the SJCEHD prior to conducting field activities. DRILLING AND SAMPLE COLLECTION URS proposes to install one deep groundwater monitoring well, one soil vapor extraction well, and 10 air sparging wells at the locations shown on Figure 2. Drilling locations will be marked, and Underground Service AIert (USA) will be notified a minimum of 48 hours prior to commencement of field activities. A private utility locator will also survey proposed drilling locations for private utilities prior to field mobilization. Before drilling commences, boreholes will be cleared using an air or water knife to a,minimum depth of 5 feet bgs with a diameter at least as large as.that of the drill bit. The borings will be drilled using a hollow-stem auger (HSA) equipped drill rig with 8.25- and 10.25-inch outside diameter augers to accommodate installation of 2-inch and 4-inch diameter wells,respectively. After every 5 feet of drilling, a soil sample will be collected for possible laboratory analysis. A portion of each soil sample will be used for headspace screening with a photo-ionization detector(PID) and for lithologic logging (soil samples will be collected continuously for the purpose of lithologic logging at depths below approximately 75 feet bgs). Samples will be selected for possible laboratory analysis from areas that show visible staining or elevated PID readings. One of the soil samples will be collected from the capillary fringe area in each boring drilled for well installation. Each soil sample retained for possible chemical analysis will be collected in brass liners, capped with Teflon® tape and plastic end caps, labeled, and placed in a cooler on ice for delivery to the analytical laboratory. At least one soil sample from each boring will be analyzed for TPHg, BTEX, MtBE, TBA, di-isopropylether �(DIPE); ethyl tent-butyl ether (EtBET-19RZii l�methyl ether (TAME), 1,2- dichloroethane(1,2-DCA), ethylene di-bromide (EDB), and ethanol by EPA Method 8260B (preparation by EPA Method 5030). Attachment B presents detailed sampling and analysis procedures. i r All down-hole equipment will be thoroughly decontaminated between drilling locations by steam cleaning. Soil cuttings and wastewater generated during drilling activities will be placed in labeled 55- gallon Department of Transportation (DOT)-approved steel drums and stored on site pending disposal. I I I KAWprccess\J5 BPARM0218612186 WP04Aoc