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CAMBRIA <br /> Mr. Harlin Knoll <br /> October 7, 1998 <br /> In October 1990,Aegis installed Wells MW-1,MW-2, and MW-3. Soil and ground water samples <br /> collected from these well borings were ND for TPHg and benzene, toluene, ethylbenzene, and <br /> xylenes (BTEX). The results of this investigation are documented in Aegis' March 26, 1991 Site <br /> Assessment/Monitoring Well installation Results Report. <br /> In August 1995,Fugro West,Inc. (Fugro)drilled Boring B-17 and installed Well MW-4. TPHg and <br /> BTEX wer6 ND in soil samples collected from these borings. The results of this investigation are <br /> documented in Fugro's November 27,1995 Subsurface Investigation Results,Annual Fourth Quarter <br /> 1995 Ground Water Monitoring Report, and Case Closure Request. <br /> Site closure was granted by the Central Valley Regional Water Quality Control Board in a July 18, <br /> 1996 letter. On October 15, 1996,Enviros,Inc. (Enviros)properly destroyed Wells MW-1 <br /> MW-4 by pressure grouting. These activities are suthrough <br /> mmarized in Enviros'November 19, 1996 Well <br /> Destruction Report. <br /> PROPOSED SCOPE OF WORK <br /> To characterize the soil,Cambria plans to conduct a subsurface investigation prior to UST removal <br /> and replacement activities. Six borings will be placed adjacent to the USTs, dispensers, and piping <br /> at the locations shown on Plate 2. <br /> Utility Location: Cambria will notify Underground Service Alert(USA)at least 48 hours in advance <br /> of our drilling activities. USA will have the underground utilities in the site vicinity identified. <br /> Site Health and Safety Plan: Cambria will prepare a site safety plan to protect site workers. The <br /> plan will be kept on site during field activities and signed by each site worker. <br /> Permits: Cambria will obtain the necessary permits for the installation of the borings from San <br /> Joaquin County Public Health Services(SJCPHS). <br /> Sail Barings: Cambria will drill three soil borings using a limited access GeoProbe®direct-push rig <br /> to 15 to 20 feet below grade (fbg) in the vicinity of the USTs. Cambria will hand-auger three <br /> additional soil borings to 5 fbg in the vicinity of the dispensers. We will collect soil samples at three <br /> to five foot intervals in all borings. Upon completion of the sampling, each boring will be sealed <br /> with neat cement grout to grade. Our standard field procedures for GeoProbe® sampling are <br /> presented as Appendix A. <br /> 2 <br />