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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Bor an,R.E.H.S. <br /> Director 304 East Weber Avenue, Third Floor <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> • .. P• Pro ram Manager Douglas W.Wilson,R.E.H.S. <br /> g g Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Co R.E.H.s. <br /> Man Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> ROBERT ALDENHUYSEN MAR 0 6 2002 <br /> RMC PACIFIC MATERIALS <br /> PO BOX 5252 <br /> PLEASANTON CA 94566 <br /> RE: RMC Lone Star Kerlinger Aggr.Plant Site Code: 1737 <br /> 30350 S TRACY BLVD <br /> TRACY,CA 95376 <br /> San Joaquin County Environmental Health Department(EHD) has reviewed your request to reuse the soil <br /> stockpiles from the 1998/1999 tank-removal for road use within the boundaries of the above-referenced site. <br /> The Soil Pile Investigation(the report) dated December 5,2001 prepared by R2%1C Pacific;Materials reported the <br /> highest concentration of diesel detected in the soil samples collected from the two stockpiles were 610 and 810 <br /> milligrams per kilogram(mg/kg). EHD staff was not present at the time of the soil sample collection. <br /> The EHD approves the plan to reuse the stockpiles. Based on the analytical results cited in the report,the <br /> stockpiles are not classified as hazardous materials. Depth to groundwater(DTVI in monitoring well DW-3 <br /> located in another area on site was measured at approximately 105 feet below surface grade(bsg)in September <br /> 1997 according to Figure 2 Ground Water Contours dated July 31,1997 and Table 1 Monitoring Well Sampling <br /> Results prepared by FMC Lonestar. The general D'TW in the area has been below 100 feet bsg historically. <br /> In a facsimile sent to you on November 30, 1999,EHD denied approval of your workplan dated November 24, <br /> 1999 to investigate the extent of the contamination by excavation to a maximum of 30 feet below surface grade <br /> (bsg) and collecting soil samples for analyses. Excavation is a costly and ineffective method to investigate the <br /> lateral and vertical extent of the contamination,and most likely would not be approved for reimbursement by <br /> the State Water Resources Control Board Cleanup Fund. Furthermore,excavation is a form of remediation. <br /> Remediation should not occur until the extent of the contamination has been defined and the most cost- <br /> effective remedial alternative has been selected. <br /> Submit a work plan that will define the vertical and horizontal extent of the contamination in the area of the <br /> 10,000 gallon diesel tank(State ID 11073002,2),the 7,000 gallon diesel tank(State ID 1798001),and the 6,500 <br /> gallon asphalt tank(State ID 1798005) by April 30,2002. EHD considers minimally that two consecutive 5- <br /> foot samples of non-detect be obtained to show vertical delineation. <br /> Please feel free to call Jeffrey Wong at(209)468-0335 if you have any questions. <br /> Donna Heran,REHS,Director <br /> Environmental Health Department <br /> C , <br /> Jeffrey Wong, Senior REHS Margaret ago.o,RI <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWQCB,Central Valley Region—Marty Hartzell <br />