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San Joa.i um County Environmental Health Division June 20, 2008 Page 5 TKN (soil) and ammonia (soil and groundwater) using Standard Method 4500; groundwater TKN will analyzed using EPA Method 351.3 TDS using Standard Method 2540C Surface soil samples will be manually collected using a slide-hammer. Prior to collecting the surface soil samples, the overlying 3-inches of soil will be hand-augered. The samples will be collected into 6-inch stainless steel tubes, which will be sealed with Teflon sheet and plastic end caps, labeled with the sample location ID, placed in a resealable plastic bag, and stored in a cooler contain ice. The locations where surface soil samples are only collected will be backfilled with the hand-augered dirt to match the surrounding ground surface. The non-disposable sampling equipment (e.g., slide-hammer, hand-auger) will be decontaminated using a triple-bucket rinse prior to sampling each location. The four soil borings included in this investigation will be advanced using a direct-push technology drill rig, with the first 5 feet of each location hand-augered. Prior to advancing the borings, the utility locator will scan for the presence of subsurface utilities in their vicinity, and provide nearby alternative locations should a suspected subsurface obstacle be detected. The soil borings will be continuously cored for lithologic logging, with the cored soil contained in clear butyrate tubing. The deeper soil samples collected from three of these four borings will be 6-inch sections cut from the tubing at a depth immediately above the approximate water table encountered at each location. Following the soil sample collection, each boring will be advanced to 20 feet bgs for the collection of grab groundwater samples. Prior to sample collection, temporary polyvinyl chloride (PVC) casing, with 5 feet of screen at the bottom, will be placed into the open boreholes. The groundwater infiltrating into the PVC casing will be collected using a peristaltic pump fitted with disposable tubing, and decanted into laboratory-supplied sample containers. The turbid groundwater will be field-filtered through 0.45-micron filters prior to sample preservation for metals analysis. Each sample container will be labeled with the sample location ID, placed in a resealable plastic bag, and stored in a cooler contain ice. Following sample collection, the temporary PVC casing will be removed and the four borings will be backfilled with neat cement. The non-disposable sampling equipment (e.g., drill rods) will be decontaminated using a steam cleaner prior to sampling each location. Groundwater samples will be collected from the four Koppel wells situated on the Site; KP-7S screened from 9 to 19 feet bgs and a total depth of 22 feet bgs, KP-7D screened from 49 to 59 feet bgs and a total depth of 61 feet bgs, KP-9S screened from 10 to 20 feet bgs and a total depth of 22 feet bgs, and KP-12S screened from 7 to 22 feet bgs and a total depth of 24 feet bgs. These four wells are constructed of 4-inch diameter PVC casing. Groundwater samples will be collected using low-flow methodology to purge the water within the well casing, with the water quality parameters pH, temperature and electrical conductivity continuously monitored during the purging. The groundwater sample will be collected once these parameters vary no more than 10 percent, or until a minimum of three well casing volumes have been removed. The P.1350001135531-USBDG Phase II Inves1Final Documents I Final REG Phase II Work Plan 052808.doc dt