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F' <br /> Mr. John Russell <br /> May 7, 1998 <br /> Page 2 of 5 <br /> washpad is located in the southwestern corner of the AASF designated area. The current <br /> washpad is in compliance with applicable regulations and in February 1996, the CANG was <br /> given a notice of intent to eliminate the need to hold a discharge permit from the City of <br /> Stockton, Department of Municipal Utilities. <br /> Following a review of the files at the SJPHS, CVRWQCB, RESD, and CANG, Versar <br /> representative Mr. Philip Cox visited the AASF on April 14, 1998 and met with Sergeant Curt <br /> Lance at the AASF. As a result of the file review and site visit, Versar has identified the <br /> following items of concern (shown on Figure 2) at the AASF: <br /> • Three 5,000-gallon underground storage tanks (USTs) formerly on Site were taken out of <br /> operation in 1989 and removed in January 1990. The former USTs reportedly appeared <br /> intact and not leaking at the time of removal. Soil and groundwater samples collected at <br /> the former UST location have indicated minimally impacted soil and groundwater. 'I <br /> Additional information regarding concentrations of contaminants in soil, and summary <br /> tables for groundwater analytical data are included in Versar's Fourth Round Quarterly <br /> Groundwater Monitoring Report, dated June 12, 1997, and included as Attachment I. <br /> • The current location of the hazardous material storage shed, shown on Figure 2, was the <br /> former location of the Paint Spray Booth. Unreported, minor spills may have resulted in <br /> localized impacts to surface soils. <br /> • Prior to construction, an older washpad was located where the current washpad is now <br /> located in the southwestern. The former wash pad system used a secondary clarifier <br /> (currently a sump) which is now connected, via subsurface piping to the stormwater <br /> system. Prior to this connection the secondary clarifier discharged to the open ditch, <br /> parallel to the current piping. An investigation conducted by West & Hansen Engineers, ti <br /> Inc. in August September 1991, identified impacted soils at the washpad, the secondary <br /> clarifier, and the discharge pit. A copy of West & Hansen's report is included in <br /> Attachment II. <br /> • An anonymous report of fuel dumping in the northeast corner of the AASF was submitted <br /> in an employee suggestion box in September 1993. The issue was addressed in a <br /> memorandum from Lieutenant Colonel P. Randall North, dated October 23, 1993. The <br /> d <br /> 122-9813134-1 00/MayT98 <br /> 1 <br />