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1 <br /> 'ATTACMUW 3 <br /> PUBLIC SAO:JIN <br /> SAN){)AQ1AN(-0[XfY <br /> P.(?. ►lox 2909 • v <br /> (1601 East fl-velton Avenric • -Stockton, r <br /> 4klon, California 952()] ' �}�` <br /> (209) 468.3400 <br /> STELLA RUIZ <br /> 4991 WEST DURHAM FERRY ROAD JAN � <br /> TRACY CA 95376 <br /> RE: Rt;iz Grocery <br /> 4491 West Durham Ferry Road Fly site Code: 1551 <br /> Tracy CA 95375 <br /> San Joaquin County public Health Services, Environmental Health Division (PHS/EH;7) has completed <br /> review of the Delta Envirorunental report, phase I Hydrogeologic Investigation, dated November 14, <br /> 1992. 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 Inlriated. <br /> Samples of monitoring wells MWl, MW2, and MW3 were collected and ana )med September <br /> 1991• Please initiate quarterly sampling and submit a t quarter of <br /> quarterly report for the firs <br /> 1992 by AAS 15, 1992- Please be informed rhat PHS/EHD inspection of samplit;g 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 t}1Q southeast. Subsequent <br /> gradient measurements, October 1991, indicated that the gradient had shifted to the east- <br /> tlorthellat. Additional monitoring wells will be necessary to investigat* groundwater <br /> contamination to the south and to the east of the former tanks. <br /> 3• OHS/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 aeratior, 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 ar±d 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, KEHS, of my staff at (209) 466-3441. <br /> 111a y irAcayy, ll%A.l 67, V► lily 3L k: <br /> tt k4VV) 'tQ0__3,+gj, . <br /> Jogi Khan , M D., M.P.H. <br /> Health .1c <br /> dr <br /> tie A C tulTa, PHS, Program Manager <br /> environmental Health Division <br /> ' i I <br /> LAC/MM/4491D1JR <br /> C, Elizabeth 'Thayer, CVRWQCB c: Peter Bailey, Delta Environmental Consultants <br />