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Ik C&rSWRrNC. <br /> 9' <br /> August 21, 2002 ASG qG C' <br /> San Joaquin County � F <br /> Public Health Services <br /> Environmental Health Division �<y <br /> 304 East Weber Avenue, Third Floor Fly <br /> Stockton, California.95202 <br /> Attention: Mr. Michael J. Infurna Jr. <br /> Senior RENS, LOP/Site Mitigation Unit IV <br /> E Subject: Work Plan to Complete Closure Requirements for Former Underground <br /> Storage Tanks, Stockton Army Aviation Support Facility <br /> 2000 Stimson Road, Stockton,.Califomia <br /> Site Code: 1732, RO#: 000052 <br /> i <br /> Dear Mr. Infurna: <br /> Versar, Inc. has prepared this work plan to address thereyuirements of the San Joaquin County <br /> Public Health Services, Environmental Health Department(PHS-EHD) in soliciting closure of <br /> the subject underground storage tank (UST) case. This workplan has'Been prepared on behalf of <br /> the California.Army National Guard.(CANE), Army Aviation Support Facility (AASF); <br /> management of this work is being performed for the CARNG by the Army Corps of Engineers, <br /> Sacramento Division<Army.COE). The requirements of the PIS-EHD were presented to the <br /> CANG in a letter dated August 03, 2000, and were subsequently amended.in April 2002. The <br /> location of the fueling area at the AASF at 2000 Stimson Road (Site) is shown in Figure 1, Site <br /> Vicinity Map. <br /> BACKGROUND <br /> Two 20;000-gallon USTs containing jet fuel were removed from the AASF fueling area in May <br /> 1998. Three soil samples per UST were collected beneath the two underlying concrete hold <br /> down slabs. Soil sample S-6 contained•0.31 milligrams per-kilogram (mg/kg) benzene, 0.91 <br /> mg/kg toluene, 2.76 mg/kg ethylbenzene, 17.33 mg/kg total xylene isomers;and 184 mg/kg total <br /> petroleum hydrocarbons as jet fuel (TPH j); TPH as kerosene was not detected.. The remaining <br /> five soil samples did not contain detected concentrations of petroleum and aromatic <br /> hydrocarbons. During the UST removal soil staining was observed in the southeast corner of the <br /> excavation. The area of impacted soil appeared to be limited,and the UST excavation was <br /> backfilled. The location of the former USTs and layout of the AASF fueling area is shown in. <br /> Figure 2 <br /> • SACRAMENTO AREA OFFICE • <br /> 7844 MADISON AVENUE,SUITE 167 • FAIR OAKS,CA 95628• TELEPHONE(916)962-1612 FAX(916)962-2678 <br />