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Ms.Amy Terrell ERM-West,Inc. <br /> 18 March 2011 <br /> Page 3 <br /> boring permit applications will be submitted to SJCEHD prior to <br /> initiating drilling activities. Underground Service Alert will be notified <br /> and a utility locator will be employed to confirm locations of <br /> underground utilities prior to intrusive activities. <br /> Soil Investigation <br /> Soil borings under the former structures associated with the Former <br /> Mixing Area and Former Liquid Tank Farm will be advanced to a depth <br /> of 6 feet bgs or first encountered groundwater. The borings will be <br /> advanced using a hand auger and continuously logged. Two soil <br /> samples will be collected from each boring. One soil sample will be <br /> collected at approximately 0.5 feet bgs and the second will be collected <br /> directly above first encountered groundwater. It is Deere's <br /> understanding that the RWQCB will not require investigation or cleanup <br /> of soil below the surface of the water table. The soil samples will be <br /> analyzed for the following: <br /> • Total Ammonia (as nitrogen) by United States Environmental <br /> Protection Agency(USEPA) Method 350.3; <br /> • Nitrate (as nitrogen),chloride, and sulfate (as SOa) by USEPA <br /> Method 300; and <br /> • Arsenic,cadmium, and lead by USEPA Methods 6010/7471A. <br /> Soil borings in the vicinity of SB-8 will be advanced to a depth of 2 feet <br /> bgs using a hand auger and continuously logged. One soil sample will <br /> be collected from each boring at 2 feet bgs and analyzed for lead by <br /> USEPA Method 6010. <br /> All soil samples will be described and logged in the field by an ERM <br /> geologist under the supervision of a California Professional Geologist. <br /> Soil cuttings will be temporarily contained on site in 55-gallon drums <br /> pending characterization and disposal. <br /> Groundwater Monitoring Well Sample Collection <br /> Groundwater samples will be collected from all four on-site monitoring <br /> wells (MW-1 through MW-4) using low-flow methods. The primary <br /> purpose of low-flow(micropurging) sampling is to minimize disturbance <br /> in the water-bearing zone and to minimize the collection of normally <br /> immobile particles in the sample, which can adversely affect the level of <br /> potential contaminant concentrations. This method also reduces the <br /> volume of water that will need to be disposed of. <br />