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Mr. Ron Rowe June 29, 1998 CAMBRIA One boring location will be located as close as possible to the southeastern dispenser, which appears to be . the primary source area. The purpose of this boring will be to determine the extent of hydrocarbons in soil above the water table and the vertical extent of hydrocarbons below the water table. Two additional onsite borings will be located near the southwestern and southeastern corners of the property. Approximately three borings will be installed southwest of the site on the southern side of East Main Street. The proposed boring locations are shown in Figure 1. Beginning during the CPT installations, a program of periodic ground water extraction will be developed. During the CPT field work,ground water will be pumped from existing ground water monitoring well MW-1, sampled, and placed into onsite drums for disposal. The amount of water produced by the well will enable Cambria to determine how often the well should be pumped, and how much water will be produced. The objective of this work is to remove hydrocarbons from the subsurface and to assess the effect of ground water extraction on hydrocarbon concentrations. Utility Location: Cambria will notify Underground Service Alert of our drilling activities to identify utilities in the site vicinity. Site Health and Safety Plan: We will prepare a comprehensive site safety plan to protect site workers. The plan will be kept on site during field activities and signed by each site worker. Permits: Cambria will obtain well permits from SJCPHS for the borings. A boring permit application and a check for the permit fee in the amount of$89 are attached. Soil Borings: Cambria will install the soil borings to approximately 20 ft below depth to water(approximately 45 ft bgs, which is the historic low ground water level, in the locations shown on Figure 1). Cone Penetrometer Testing(CPT): At each of the boring locations, CPT will be used to obtain lithologic information. The CPT log for the source area boring will be compared to the boring log of the boring for the installation of monitoring well MW-1. Standard field procedures for CPT are presented as Attachment A. Soil Sampling: For the soil boring located in the source area, Cambria will collect soil samples at five ft A0 intervals and at lithologic changes that were not encountered in the boring for MW-1. Canab= will select soil samples for chemical analysis based on observations of staining and odor and on the results of field �� screening with a volatile vapor analyzer. In addition to the Cambria standard protocol, soil samples will beX, t1 selected for physical analyses based on lithologic changes, historical ground water levels, on observations of staining and odor, and on the results of field screening with a portable vapor analyzer. 2 o� J S