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`' -PUBLIC I ALTH *4...N. <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor - Stockton, CA 95202 <br /> 209/468-3420 OU _ <br /> EXECUTIVE OFFICER <br /> CENTRAL VALLEY REGIONAL <br /> WATER QUALITY CONTROL BOARD SEP 0 8 1 <br /> 3443 ROUTIER RD STE A <br /> SACRAMENTO CA 95827-3098 <br /> RE: BEACON STATION #695 SITE CODE: 1841 <br /> 900 S CHEROKEE LANE E <br /> LODI CA <br /> f <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) discussed this site at our Technical Review Committee meeting on <br /> January 6, 1997. At that meeting it was decided that the diesel plume in the <br /> groundwater should be delineated and that it may be able to be accomplished by <br /> additional sampling of some of the monitoring wells. Analysis for methyl tertiary <br /> butyl ether was also to be conducted. In addition, information regarding the , <br /> z waste oil tank removed in November 1986 was to be submitted and confusion _ <br /> regarding monitoring wells MW 25 and MW 27 was to be cleared up. <br /> Depth to water measurements and sampling of some of the monitoring wells <br /> occurred in February and May 1997. Depth to water during those sampling <br /> events was similar to that in March and June 1996. Water sample results from <br /> February and May 1997 for benzene, toluene, ethyl benzene, xylene, and total <br /> petroleum hydrocarbons as gasoline are similar to those evidenced in March and <br /> June 1996. Methyl tertiary butyl ether was not detected in the groundwater <br /> samples analyzed for this oxygenate. <br /> F Results of the soil sample collected beneath the waste oil tank removed in <br /> November 1986 have been submitted and no contamination was evidenced. <br /> Clarification of the monitoring wells identified as MW 25 and MW 27 was <br /> provided in a June 27, 1997 letter from Ultramar. In addition, mass balance <br /> calculations for diesel in the soil before and after remediation have been <br /> provided. <br /> r <br /> Therefore, our agency has determined that the site investigation and remedial <br /> s action required for the site have been completed. A site history memo dated <br /> January 29, 1997 has been prepared by your staff. Enclosed is a "Case Closure <br /> Summary" for the site which is to be forwarded to you according to our Local <br /> Oversight Program contract with the State Water Resources Control Board. <br /> A Division of San Joaquin County Health Care Services <br />