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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> �o._�•coG Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Third Floor Carl Borgman,R.E.H.S. <br /> Director 304 East Weber Avenue, Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • �.. �P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> gZ.iFORa Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> APR 0 4 2002 <br /> JOHN ANDERSON <br /> PO BOX 1410 <br /> DAVIS CA 95617 <br /> RE: A.W.HAYES SITE CODE: 2546 <br /> 2005 NAVY DRATE <br /> STOCKTON CA 95206 <br /> A 1000-gallon waste oil underground storage tank(USI)and a 12,000 gallon diesel UST were removed at the <br /> above-referenced site in 1987. Six soil borings were advanced at the site in October 1999,and soil and grab <br /> groundwater samples were collected for laboratory analyses. San Joaquin County Environmental Health <br /> Department(EHD)reviewed the Summary Report(the report)dated November 30,1999 prepared by Ramcon. <br /> Analytical results of the soil samples were non detect for Total Petroleum Hydrocarbons as diesel(TPH-d), <br /> TPH as gasoline(IPH-g by Method 8026B),cis-1,2-dichoroethylene(cis-1,2-DCE),and trans-1,2- <br /> dichoroethylene(trans-1,2-DCE). Analytical results of the grab groundwater sample collected from soil boring <br /> #1 (B-1)were 62 micrograms per liter(µg/L)of TPH-d. Results of B-2 grab water sample were 61 µg/l of cis- <br /> 1,2-DCE;from B-3 the grab water sample results were 200µg/l of TPH-g and 300 pg/1 of cis-1,2-DCE;from <br /> B-4 the water sample results were 160 pg/1 of TPH-d;from B-5 the results were 850µg/l of TPH-g and 260 <br /> µg/l of trans-1,2-DCE and 1500µg/l of cis-1,2-DCE. <br /> The Primary Maximum Contaminant Levels (MCL) for drinking water established by California Department of <br /> Health Services is 6µg/l for cis-1,2-DCE,and 10 pg/1 for trans-1,2-DCE. The extent of the contamination in <br /> groundwater has not been defined. While EHD agrees with the report's recommendation that future <br /> assessment should include evaluation of the oil/water separator's role in the detection of these chlorinated <br /> solvents,1,2-DCE has also been a known gasoline additive found in many underground storage tank sites. <br /> According to Appendix B of the Tri-Regional Board Staff Recommendations for closure of underground tank <br /> sites,the extent of the plume must be defined both vertically and laterally,and a 2000-foot well receptor survey <br /> must be conducted to evaluate any potential receptors of the plume before a site can be considered for no- <br /> further-action status. Submit a work plan to EHD that will define the extent of the contamination plume by <br /> May 30,2002. <br /> Conduct and submit a 2000-foot well receptor survey to EHD by June 30,2002. Include in the survey a scaled <br /> map with properly labeled receptors,and any known construction details of the wells. A work plan for a well <br /> survey is not required. <br /> Please feel free to contact Jeffrey Wong at(209)468-0335 if you have any questions. <br /> Donna Heran,REHS,Director <br /> Environmental Health De artm nt <br /> RE <br /> Jeffrey Wong,REHS Margar <br /> agorio, H <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWQCB,Central Valley Region—Marty Hartzell <br /> c: Ramcon—Mike Gereghty <br />