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CAMBRIA <br /> Mr. Ron Rowe <br /> August 20, 1999 <br /> Cambria will install three dual-completion monitoring well points.in the locations shown in <br /> Figure 1. The well point near the product islands, MW-4 (A,B), will be constructed by <br /> installing two separate 4-inch well casings in separate 8-inch borings. The other two monitoring <br /> points, MW-5 (A,B) and MW-6 (A,B), will be constructed by installing two separate 2-inch <br /> well casings in one 10-inch boring. <br /> The specific tasks to be performed for the onsite and offsite well installations 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: Cambria will prepare a comprehensive site safety plan to protect <br /> site workers. The plan will be kept on site at all times and signed by all site workers during <br /> each of the stages of the field work. <br /> Permits: Cambria will obtain well permits as required from the San Joaquin m Coun <br /> t <br /> Y <br /> Department of Public Health.Services (SJCPHS), and will obtain offsite access agreements. <br /> Monitoring Well Construction: The wells-near the dispenser island, MW-4 (A,B), will be <br /> constructed of two 4-inch casings in separate 8-inch borings. The upper casing will be <br /> completed at an approximate depth of 45 ft bgs, and be screened from approximately 25 to 45 ft <br /> bgs. The deeper casing will be completed at approximately 75 ft bgs and be screened from <br /> approximately 55 to 75 ft bgs. <br /> The remaining two wells,MW-5 (A,B) and MW-6 (A,B), will each be constructed of two 2-inch <br /> casings in one 10-inch boring. The well constructions will be similar to the well proposed near <br /> the dispenser island. For all the wells, the well heads will be sealed and locked beneath a <br /> traffic-rated vault. <br /> SJCPHS recommendations for well construction will be observed, including the guideline of <br /> screened intervals not greater than 20 feet in length. Well construction will be based on field <br /> observations of lithology and the extent and concentration of hydrocarbons. Cambria will be <br /> prepared to install a variety of slot sizes, and screened intervals. <br /> Soil Sampling: In addition to the Cambria standard protocol, Cambria will select soil samples <br /> from the well borings .for chemical analysis based on historical ground water levels, on <br /> observations of staining and odor, and on the results of field screening with a portable vapor <br /> analyzer. Our standard sampling protocol is described in Attachment A. <br /> 2 <br />