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J <br /> D.K. BARBE .E. & ASSOCIATES u <br /> 8710 Mt.Vernon Rd.,Auburn,CA 95603 Phone/Fax(530)823-2156 <br /> October 21, 2004 <br /> Mr. Jeffrey Wong, Senior REHS <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E Weber Ave., Third Floor l4 V <br /> Stockton, CA 95202 <br /> ? � 1 9 FEIN, n 12005 <br /> Dear Mr. Wong, SZ�c�,k �. D4C ENVIRONMENTHEALTH <br /> w Z Do 4 �� PERMIT/SER VICES <br /> Amendment to: Workplan for additional Soil and Groundwater <br /> Characterization of Western Oil & Spreading Inc. Acampo Plant Site - <br /> 19256 N Highway 99, Acampo, CA <br /> Thank you for hosting a meeting at your office, 12 October 2004, with Mr. Chris <br /> Walker (Site Operating Company's General Manager), Dr. Hans Ho (Owner's <br /> Environmental Manager), Ms. Margaret Lagorio, R.E.H.S. (EHD-SJCo), Mr. Jeffrey <br /> ` Wong (R.E.H.S. (EHD-SJCo)and me attending. <br /> You expressed a strong concern that the ground water characterization effort could <br /> not be considered complete until a non-detect level, of about less than 50 parts per <br /> billion (ppb), is indicated in sampled ground water from beyond the leading edge of <br /> the site generated plume boundary. <br /> Furthermore, we understood that your office desires more lithographical information <br /> from the plume area. Presumably this insight will aid in a determination if the down <br /> gradient domestic and agricultural wells (located on property abutting the south edge <br /> of Woodbridge Road) are threatened by petroleum hydrocarbons released from the <br /> subject site. <br /> Finding the "clean line„ or non-detect edge of plume is a goal of this characterization <br /> program. <br /> Western Oil and Spreading Inc.'s (WOS) Chris Walker and EHD-SJCO expressed a <br /> joint concern that the neighboring wells be neither contaminated nor threatened in the <br /> future. WOS agreed to use the Cone Penetration Test (CPT) method to assist in the <br /> definition of the subsoil and to collect water samples at both the first encountered and <br /> a point below a separating low permeability soil stratum. Limitations of the 30 TN test <br /> truck based upon two earlier rounds of probing may be 70 to 80 FT deep. <br /> The area to be probed with the CPT is an open plowed field. It is not practical to enter <br /> it after it has become saturated from winter rains. At the time of the meeting WOS <br /> 1 <br />