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D.K. BARBER P.E. & ASSOCIATES <br /> 623 Camellia Way, Lodi,CA 95242 Phone/Fax(209)369-0482 <br /> March 19, 2003 <br /> Mr. Jeffrey Wong, Senior REHS <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E Weber Ave., Third Floor <br /> Stockton, CA 95202 <br /> Dear Mr. Wong <br /> Transmittal of: Quarterly Groundwater Monitoring Well Findings- <br /> December 20, 2002 Samples <br /> Western Oil & Spreading Inc. Acampo Plant Site - <br /> 19256 N Highway 99, Acampo, CA <br /> Please find below and attached, the Quarterly Monitoring Well Analysis Report for the <br /> subject site. Also, please reference the Interim Summary of Findings, dated April 30, <br /> 2001 with February 28, 2002 Addendum, May 8, 2002 work plan forwarded to you <br /> earlier and the Interim Summary of Findings, dated September 16, 2002 and <br /> December 15, 2002. <br /> Background: <br /> The site is on approximately 2.13 AC of relatively flat, covered by aggregate road <br /> base, improved land hosting a liquid asphalt and lignin based road oil storage and <br /> mixing facility. The site's industrial history has been chronicled back to 1955. <br /> Currently there are 16 above ground storage tanks containing petroleum <br /> hydrocarbon, water or lignin based products. The site is active. In 1985 the <br /> business was purchased by Mike and John Telfer and renamed Western Oil and <br /> Spreading, Inc. (WOS). The site is bordered on the north by an open field <br /> (previously an apple orchard), to the east and south by open fields and to the west by <br /> several homes, separating it from the frontage road. It is one quarter mile south of <br /> Woodbridge Road in Acampo, CA within San Joaquin County. Reference <br /> ATTACHMENT 1, LOCATION MAP. <br /> Four underground storage tanks were removed from the site in October 1987. <br /> Petroleum hydrocarbon contamination was discovered resulting in an ongoing effort to <br /> characterize, remedy possible contamination and close the site. <br /> D.K. Barber P.E. and Associates continued characterization efforts from October 2000 <br /> through April 2001. Sampling with a Geoprobe, direct push technology boring rig, <br /> installation of a 62 FT deep monitoring well (MW) and sampling of the ground water <br /> have indicated that contamination exists. <br /> Ref.'Report for 19256 N. Hwy 99, Acampo, CA May 24,1999 Gallardo&Associates,Windsor, CA <br />