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Mr. Ron Rowe <br /> December 18, 1998 <br /> CA M B R I A <br /> be effective if ground water levels have risen. If ground water levels have not risen and the <br /> periodic pumping is not effective, the pumping will be stopped. <br /> The specific tasks to be performed for the onsite well installations and CPT installations <br /> include: , <br /> Utility Location: Cambria will notify Underground Service Alert of our drilling activities to <br /> identify utilities in the site vicinity. <br /> Site Health and Safety Plan: We will prepare a comprehensive site safety plan to protect site <br /> IIS workers. The plan will be kept on site at all times and signed by all site workers during each of <br /> the stages of the field work. <br /> Permits: We will obtain well permits as required from the San Joaquin County Department of <br /> Public Health Services (SJCPHS), and will obtain offsite access agreements. <br /> Soil Borings: Cambria will drill the soil borings for the wells to approximately 40 feet below <br /> j <br /> ground surface (bgs) to define the extent of hydrocarbons below the source area. We anticipate <br /> encountering ground.water at an approximate depth of 25 to 27 feet bgs. <br /> I <br /> Monitoring Well Construction: The soil boring near the dispenser island and the soil boring <br /> near the tank complex will be converted into four-inch diameter ground water monitoring wells <br /> screened approximately 5 feet above and 15 feet below the static water table. The third soil <br /> boring will be converted to a two-inch ground water monitoring well screened approximately <br /> 5 feet above and 15 feet below the static water table. The well heads will be sealed and locked <br /> i <br /> beneath a traffic-rated vault. <br /> SJCPHS.recommendations for well construction will be observed, including the guideline of <br /> have well screened intervals not greater than 20 feet in.length. Well construction will be based <br /> on field observations of lithology and the extent and concentration of hydrocarbons. Cambria <br /> will be prepared to install a variety of slot sizes, screened intervals, and/or nested wells, if <br /> needed. <br /> Cone Penetrometer Testing (CPT): At each of the CPT boring locations, CPT will be used to <br /> obtain lithologic information. Standard field procedures for CPT are presented as Attachment A. <br /> I <br /> Soil Sampling: In addition to the Cambria standard protocol, Cambria will select soil samples <br /> from the well borings and CPT borings for chemical analysis based on historical ground water <br /> i <br /> 2 <br /> } <br /> `E <br />