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vivo <br /> EAST BAY +! <br /> MUNICIPAL UTILITY DISTRICT t � MICHAEL J.WALLIS <br /> DIRECTOR OF WASTEWATER <br /> January 28, 1993 ENV ,ONTAL��HEALTH <br /> PERMIT. <br /> Ms. Diane Hinson, REHS CERTIFIED MAIL-- <br /> San Joaquin County Public Health Services RETURN RECEIPT REQUESTED <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Dear Ms. Hinson: <br /> Re: EBMUD Stockton Center, 1804 West Main Street, Site Code 1169 <br /> Thank you for taking the time to meet on January 19, 1993 . Your <br /> guidance on, and understanding of, the Stockton project was very <br /> helpful. As we agreed, this letter will serve to summarize the <br /> outcome of our discussion. <br /> In a letter from the East Bay Municipal Utility District <br /> (District) to the San Joaquin County Public Health Services <br /> Environmental Health Department (PHS-EHD) dated January 12, 1993, <br /> the District outlined its proposed schedule for Board approval of <br /> consultant procurement and remediation. A copy of the proposed <br /> Stockton Yard project schedule is attached. The schedule was <br /> reviewed and agreed upon by both the District and the PHS-EHD <br /> during our meeting. <br /> As per the attached schedule, Board approval and Notice to <br /> Proceed should be obtained in early June 1993 . In the interim, 2 <br /> quarterly monitoring events will be conducted to satisfy PHS-EHD <br /> requirements for additional data. Previous groundwater sampling <br /> conducted during March 1991, and July and October 1992 , detected <br /> Total Petroleum Hydrocarbons as gasoline (TPH(g) ) , and Benzene, <br /> Toluene, Ethylbenzene, and Xylene (BTEX) compounds in only one <br /> (MW-1) of 7 monitoring wells. In addition, soluble lead was not <br /> detected in any groundwater samples. Based on this data, it was <br /> agreed that the number of wells sampled and suite of analyses <br /> should be reduced for the 2 interim monitoring events. <br /> During interim monitoring, monitoring wells MW-1, MW-2 , MW-5, and <br /> MW-7 will be sampled for TPH(g) only. TPH(g) results will serve <br /> as an indicator of hydrocarbon compound migration. Should TPH(g) <br /> be detected in monitoring wells other than MW-1, subsequent <br /> sampling will be adjusted to provide more data. In addition, <br /> analyses for soluble lead will no longer be conducted. <br /> At PHS-EHD's request, physical parameters will be measured in all <br /> the monitoring wells during interim monitoring. The suite of <br /> physical measurements and data presentation format will be the <br /> same as in previous reports to facilitate data comparison. <br /> P.O.BOX 24055. OAKLAND. CA 94623-1055. (510) 465-3700 <br /> BOARD OF DIRECTORS NANCYJ.NADEL.KATHERINE McKENNEY.ANDREW COHEN <br /> JOHN A.COLEMAN.STUART FLASHMAN.JOHN M.C,IOIA. KENNETH H.SIMMONS <br />