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'k <br /> Juan Quijano <br /> Page 2 <br /> Monthly status reports are requested, initially for one quarter, to review the adequacy of the <br /> groundwater remediation system in operation. Submit the first monthly status report within 30 days <br /> of the date of this letter.' <br /> 6. The 5,000 gallon underground storage tank #4, contained both gasoline and diesel. In order to <br /> investigate the possibility of diesel contamination of groundwater,commence analysis of TPH-diesel <br /> in addition to contaminants already analyzed. <br /> 7. In the July 27, 1989 PHS/EHD letter, a request was made:to show that high soil lead levels: <br /> 8.9 ppm tank #2 <br /> 7.5 ppm tank #3 <br /> 5.4 ppm MW 1 at 11 feet <br /> 5.4 pprri MW 3 at 6 feet <br /> 5.6 ppm MW 4 at 6 and 10.5 feet <br /> j 6.8 ppm soil stockpile 1-8 composite <br /> 7.7 ppm soil stockpile 9 <br /> were background levels. These levels exceed the soluble threshold limit concentrations (STLC) but <br /> are below the total threshold limit concentration ('ITEC) as outlined in the California, Code of <br /> Regulations,Article 11,Section 66699. Soil samples must undergo the Waste Extraction Test(WET) <br /> to determine which portion of total lead is soluble as outlined in the California Code of Regulations, <br /> .Article 11, Section 66700. <br />` 8. On January 29, 1988, 8 samples of stockpiled soil were field composited into one sample. This <br /> result was used to determine that th' stockpiled soil was no longer contaminated: This method and <br /> number of samples composited is unacceptable. Additional borings will be necessary to determine <br /> that the backfilled soil is uncontaminated. <br />{ Please submit a Work Plan for the additional soil investigation within 60 days from the date of this letter. <br /> Please locate the septic system on the adjacent property, 26500 North Galt Road, as leach lines provide <br /> conduits through which contamination quickly migrates. <br /> If you have any questions, contact Mary Meays, EHS, of my staff, at (209)468-3441. <br /> Jogi Khanna, M.D., M.P.H. <br /> Health Officer` <br /> Laurie A. Cotulla, RENS, Program Manager <br /> Environmental Health Division <br /> LAC/MM:nr <br /> c: CVRWQCB - Elizabeth Thayer <br /> C.: WaterWork/Resna Industries - Bill Channell <br />{ <br /> 3 <br /> 1 <br /> L i <br />