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PUBLIC, HEALTH SERVICES <br /> SAN JOAQUIN COUNTY r. <br /> JOGI KHANNA Nf.D.,M.P H. <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton,California 95201 C4�tFpRa`R <br /> (209) 468-3400 <br /> STELLA RUIZ <br /> 4991 WEST DURHAM FERRY ROAD JAN 2 1 1992 <br /> TRACY CA 95376 D <br /> RE: Ruiz Grocery Site Code: 1551 <br /> 4491 West Durham Ferry Road <br /> Tracy CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed <br /> review of the Delta Environmental report, Phase I Hydrogeologic Investigation, dated November 14, <br /> 1991. PHS/EHD has the following comments are to be addressed by April 15, 1992- <br /> 1. The PHS/EHD letter dated June 11, 1991 requested that quarterly monitoring be initiated. <br /> Samples of monitoring wells MW1, MW2, and MW3 were collected and analyzed September <br /> 1991. Please initiate quarterly sampling and submit a quarterly report for the fust quarter of <br /> 1992 by April 15, 1992- Please be informed that PHS/EHD inspection of sampling events are an <br /> important aspect of local regulatory oversight. Prior to any site activity, including sampling, <br /> please contact Mary Meays at the number below, 48 hours in advance. <br /> 2. The first recorded groundwater gradient, September 1991, was to the southeast. Subsequent <br /> gradient measurements, October 1991, indicated that the gradient had shifted to the east- <br /> northeast. Additional monitoring wells will be necessary to investigate groundwater <br /> contamination to the south and to the east of the former tanks. <br /> 3. PHS/EHD agrees with the Delta Environmental recommendation to re-excavate in the area of the <br /> former tanks. Residual contamination remaining at the conclusion of the re-excavation attempt <br /> will require additional remediation. Please be informed that uncontrolled aeration of soil with <br /> greater than 50 ppm TPH-gas is no longer allowed. Controlled aeration of soil with greater that <br /> 50 ppm TPH-gas requires an air pollution permit which is granted by the San Joaquin Valley <br /> Regional Air Pollution District. Please submit a workplan for the proposed re-excavation. <br /> 4. Reports, workplans and letters are to be submitted to both PHS/EHD and the Central Valley <br /> Regional Water Quality Control Board (CVRWQCB) until the investigation or cleanup is adequate <br /> for closure. This will facilitate concurrent and expeditious evaluation by both agencies. <br /> If you have any comments, questions, or wish to schedule a sampling inspection, please contact <br /> Mary Meays, RENS, of my staff at (209) 468-3441. <br /> Jogi Khan , M D., M.P.H. <br /> Health lc <br /> L <br /> rie A. Cotu a, HS, Program Manager <br /> nvironmental Health Division <br /> LAC/MM/4491DUR <br /> y c: Elizabeth Thayer, CVRWQCB c: Peter Bailey, Delta Environmental Consultants <br /> A Division of San Joaquin County Health Care Services �� <br />