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t <br /> URS <br /> Mr Harlin Knoll Page 3 of 5 <br /> San Joaquin County Environmental Health Department <br /> July 12, 2005 <br /> be contracted to locate underground utilities around the proposed drilling locations In addition the <br /> first 5-feet bgs in each boring will be cleared with an air or water knife to diameters of 8 25-inches <br /> and 10 25-inches as necessary <br /> One 8 25-inch diameter, soil boring will be drilled using a hollow-stem auger(HSA)equipped dnll <br /> rig The boring will be advanced to a total depth of approximately 45 feet bgs to accommodate the <br /> installation of a single 2-inch groundwater monitoring well (MW-9) <br /> One 10 25-inch diameter,soil boring will be drilled using a hollow-stem auger(HSA)equipped drill <br /> rig The boring will be advanced to a total depth of approximately 45 feet bgs to accommodate the <br /> installation of two 2-inch groundwater monitoring wells <br /> Soil samples will be collected at 5-foot intervals in brass liners A URS geologist will log the soils <br /> encountered during drilling according to the Unified Soil Classification System Soil will be field <br /> Screened for the presence of volatile organic vapors using a photoionization detector(PID) At least <br /> one soil sample for each boring will be selected for analysis Soil samples selected for laboratory <br /> analysis will be preserved by capping both ends of the brass tubes with Teflon®tape and plastic end <br /> • caps, placed in a cooler on ice, and transported to a California certified laboratory under chain of <br /> custody for analysis of gasoline range organics (GRO) by EPA Method 8015B or 8260B <br /> (preparation by EPA Method 5030),benzene,ethylbenzene,toluene,xylene,(BTEX),MtBE,TBA, <br /> di-isopropyl ether (DIPE), ethyl tert-butyl ether (ETBE), tent-amyl methyl ether (TAME), 1,2- <br /> dichloroethane(1,2-DCA),and 1,2 dibromomethane(EDB),by EPA Method 8260B(preparation by <br /> EPA Method 5030) <br /> All down-hole drilling and sampling equipment will be thoroughly decontaminated between drilling <br /> locations by steam cleaning and/or washing in a non-phosphate detergent cleaning solution Soil <br /> cuttings and wastewater generated during the drilling activities will be placed in labeled 55-gallon <br /> Department of Transportation(DOT)-approved steel drums and stored on site,pending disposal All <br /> drummed soil cuttings will be sampled and analyzed for GRO,by EPA method 8015B(preparation <br /> EPA Method 5030) and BTEX by EPA Method 8260B (preparation EPA Method 5030), and total <br /> lead by EPA Method 6000!7000 series <br /> Monitoring Well Installation <br /> MW-9 <br /> One deep groundwater monitoring well will be constructed in its respective borehole using 2-Inch <br /> outside-diameter(OD), schedule 40,flush-threaded polyvinyl chloride(PVC)well casing Five feet <br /> • <br /> K IWprocessV5 SP ARC0111194\2005 Well Install\11194 Well Install WP 05 doc <br />