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0 <br /> ENVIRONMENTAL HALTI1 DEPARTMENT <br /> SAN JOAQU N COUNTY <br /> c Unit Supervisors <br /> ) � OG <br /> z :? Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> 304 East Weber Avenue, Third Floor <br /> N:4.. Director Mike Huggins,R.E.H.S.,R.D.I. <br /> ` Al Olsen, ,.. <br /> . <br /> R.EHSStocktonCalifornia 95202-2705 <br /> �.r Douglas W.Wilson,R.E.H.S. <br /> r.;, a :Y `P• Program Manager Telephone: ( 09) 468-3420 Margaret Lagono,R.E.H.S. <br /> Qcio'R� Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (20 ) 464-0138 Mark Bcucellos,R.E.H.S. <br /> MAR 2 0 2002 <br /> KAREN PETRYNA <br /> EQUILON ENTERPRISES <br /> C/O EQUIVA SERVICES LLC <br /> P O BOX 7869 <br /> BURBANK CA 91510-7869 <br /> RE: AIRPORT SHELL SITE CODE: 000692 <br /> 1313 E CHARTER WAY <br /> STOCKTON CA 95205 <br /> San Joaquin County Environmental Health Department(E )has reviewed the Site Investigation Report dated <br /> November 7,2001 prepared by Cambria. Analytical results of the soil samples collected from soil boring#1 <br /> (SB-1)at 21.5 feet below surface grade(bsg)were 7,600 n-iilhgf ams per kilogram(mg/kg)of Total Petroleum <br /> Hydrocarbons as gasoline(IPH-g),21 mg/kg of Toluene,82 ing/kg of Ethyl Benzene,and 780 mg/kg of <br /> Xylenes. Analytical results of soil samples collected from SB-1 at 40.5 feet bsg and 50.5 feet bsg,as well as soil <br /> samples collected from SB-2,SB-3,and SB-4 at varying depth to 35.5 feet bsg were all non detect for TPH-g <br /> and aromatic hydrocarbons(BTEX). Analytical results of the grab water sample collected from SB-1 at 67 feet <br /> bsg were 780 micrograms per liter(jig/1)of TPH-g,19 ltg/l of Toluene,20µg/l of Ethylbenzene,and 120 <br /> µg/L of Xylenes. Oxygenates, 1,2-dicboloroethane(1,2-DCA) and ethylene dibromide(EDB)were not <br /> detected in any soil or grab water samples. <br /> Historical groundwater low according to San Joaquin Countylood Control 1986 Lines of Equal Depth map is <br /> about 30 feet to 40 feet bsg,and historical groundwater high according to San Joaquin County Flood Control <br /> 1986 Lines of Equal Depth map is about 75 feet bsg. Recent oundwater monitoring at a nearby property at <br /> 1419 Charter Way indicated the general groundwater flow direction is to the southeast. <br /> EHD does not agree with the Cambria's recommendation for case closure at this time. SB-1 was advanced at <br /> the old dispenser area where petroleum hydrocarbon contamination was reported(soil sample P-1)according <br /> to Underground Storage Tank Report dated August 18,1999. Sine no soil or water samples were collected in the <br /> groundwater flow downgradient direction south and southeast of SB-1,the extent of the soil and groundwater <br /> contamination has not been defined_ Submit a work plan to E,HD that will define the extent of the soil and <br /> groundwater contamination,including installation of monito g wells to determine the site specific gradient <br /> and the impact to groundwater. <br /> EHD directs a 2000-foot well receptor survey be performed i Ls soon as possible. EHD recommends using the <br /> checklist in Appendix B,Tri-Regional Board Staff Recommendations as a guideline for obtaining the data <br /> required to justify site closure. <br /> Donna Heran,REHS,Director <br /> Environmenta Health Department <br /> (' `�y Margaret agorio,REHS <br /> Je frey Wong,Senior RENS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> C: CRWQCB,Central Valley Region—Marty Hartzell <br /> C: Cambria—Joe Neely <br />