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PUBLIC <br /> HEALTH SERVICES �aRa�o <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 /> 2091468-3420 FILE C <br /> CRAIG OGATA <br /> SAN JOAQUIN COUNTY FACLITIES MANAGEMENT FEB 0 4 1999 <br /> 222 E WEBER RM 675 <br /> STOCKTON CA 95202 <br /> RE: Agricultural Commissioner's Office SITE CODE: 1793 <br /> 503 East Tenth Street <br /> Tracy CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has reviewed the "Monitoring Well Installation and Groundwater Sampling Report", dated <br /> January 27, 1999, that was prepared by Ramage Environmental for the above <br /> referenced site, and has the following comments for your consideration. <br /> The report details work performed on site on October 29, 1998, when three groundwater <br /> monitoring wells were installed, and the subsequent development and sampling of the <br /> wells which occurred on November 5, 1998. The three monitoring wells were installed to <br /> surround the former tank pit area. Previous fieldwork performed at this site indicates <br /> that the main concentration of soil and groundwater contamination is in the former tank <br /> pit area. Analytical results of the collected water samples were non-detect (ND) for all <br /> constituents analyzed for, with the exception of 140 parts per billion (ppb) of total <br /> petroleum hydrocarbons as diesel (TPHd) in MW-2, which is the down-gradient well. <br /> PHS/EHD has the following recommendations: Another round of groundwater monitoring <br /> should be performed to confirm the ND results; Existing soil data should be used to <br /> prepare a mass balance calculation to estimate the residual contamination in the former <br /> tank pit area. Following this, evaluation may be made as to the potential threat to <br /> ground water quality posed by this site, and/or the need for further corrective action. <br /> If you have any question or comments, please call Lori Duncan at (209) 468-0337. <br /> Donna Heran, REHS <br /> Director, Environmental Health Division <br /> L CA, <br /> Lori Duncan, REHS Margard Lagorio, REHS <br /> Site Mitigation Unit IV Supervisor, Unit IV <br /> cc: Mark List, CVRWQCB <br /> Joe Ramage, Ramage Environmental <br /> A Division of San Joaquin County Heaith Care Services <br />