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under the supervision of a California Registered Geologist using the Unified Soil Classification <br /> System (USCS). <br /> All coring and sampling equipment will be cleaned prior to use to prevent cross contamination <br /> between borings. The sampling equipment and brass sample tubes will be cleaned using a solution <br /> of Alconox and tap water, rinsed in tap water and final rinsed with deionized water to prevent <br /> cross contamination between samples. Alconox is a non-phosphate detergent. <br /> After completion of the drilling and sampling, the boreholes will be backfilled with neat cement <br /> to surface grade. <br /> GROUNDWATER MONITORING <br /> Prior to collecting groundwater samples, the depth to groundwater will be measured in each well. <br /> Groundwater samples will be collected after three well volumes of groundwater have been <br /> removed. This is to ensure that all stagnant water is removed from the area of the well bore, and <br /> that the groundwater sample is representative of in situ conditions. Once the well volumes have <br /> been removed and conditions such as water temperature, turbidity, conductivity and pH are <br /> consistent, a water sample will be collected using a Teflon or stainless steel bailer and transferred <br /> to appropriate containers supplied by the analytical laboratory. There are three wells on the <br /> subject property. Purge water will be stored on-site in 55 gallon drums for proper disposal at the <br /> conclusion of the job. <br /> SOII. AND GROUNDWATER ANALYSIS <br /> Soil and groundwater samples will be sent to BC Laboratories in Bakersfield, California, in a <br /> chilled condition and under a chain-of-custody protocol, at the end of each day. BC Laboratory <br /> is a California DHS-certified laboratory. <br /> Soil samples will be analyzed for the following: <br /> EPA 8015 Extractable 8015/8020 Volatilies <br /> TPH as Diesel/Hydraulic Fluid TPH as gasolineBTEX <br /> American Savings Bank Project b 9620-040-1 <br /> October 9, 1994 3 Stockton,California <br />