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T&-T TRUCKING'. November'9, 1995 P.age 2 The former.4,000.-gallon UST was located 50 feetwest'of the office building (Figure 2). The fuer dispenser-was locafed aajacentao'the eastern side of the UST.' Past inventory.monitoring up,to and including February. 17,•.1995 -revealed no.fuel loss from the UST. Previous precision leak testing indicated the,UST tested fight. -On February 20; 1995,,,a:970_.gallon.release of fuel was detected during inventory monitoring; and-the remainder of the fud was .removed.from .the UST the same day... The UST was•rembved on'.March 29; 1995 by.Johnson Petroleum. Soil samples (T1A and TIB) were.collected_ from the.bottom of the excavation.by.Wallace-Kuhl &.Associates (WKA). Test results:ol the.soil sample'(Tl.B):collected Froin beneath the southern end-of:the'-tank:ata depth.of- 14.5.feet ievealed no detectable.concentrations'of petroleum hydrocarbons. .The soft sample.(T1A) 'collected from beneath the.northern .end'of the tank at a,depth of 15 feet revealed.an elevated concentration, of 1600.mg/kg Total `,Petroleum Hydrocarbons '(TPH),as gasoline and elevated benzene; toluene, efhylbenzene, .and .xylenes '(.BTEX) concentrations. A summary of-analytical results.is.included as Table 1.: -,- ,OVerexcavation of the:-contammited soil .to depths ranging,betNv&n 15.and 17 feet byT &. T Trucking began on.March 30,.1995, and.continued'for,three days; Approximately ?50 cubic' yards . ' of soil-,was:reitioved and,stockpiled ori and covered with,plastic WKA collected a total'of, 14 sidewal. and bottom sainples,(EX 1 through.EX 10) from the`.excavation on June 12, 1.995, at the locations slior�m on Figure:2 ,Test results of:soil samples.revealed no detectable concentration of . TPH as gasoline Io' 'BTEX along the excavation sideyvAs at a depth of nine feet'below grade, nor . in samples.collected fromberieath the tank at.a depth of 1,5 feet below grade.'Visual"and olfactory observations at the.tiriie.of excavation'indicated:the.presence of petroleum'hydrocarbons along the southern sidewall.- The excavation was subsequently.,,backfilled.tosuHaCe gra&: .w-iihstockpiled .-soil that tested.clean. In early.September 1995; an estimated:50 cubic.yards=of soil.was excavated by T &.-T Trucki south of the former UST.excavation` .The excavated soil was stockpiled on and:`covered with plastic. A total of°six bottom samples (EX•I1 through EX16).were,collected.by WKA from.the new excavation on.September 5, 19.95. Test-results revealed,trace concentrations of petroleum hydrocarbons only-.in-samples,EX 13; EX 14; and EX 16. The excavation was deft-open.pending laboratory.results.: Based on the findings.discussed above,::the lack oflateral and vertical definition of the detected petroleum hydrocarbons;.and at the re'quest.of the:San Joaquin County Environmental.Health Division,we intendto.complete the fol loxi-ing v,ork 8�5'North Lincoln,Suite E _D.ixon, California 95620 2172 Phone 916.678A253 .'.Fax 916.678.19:88