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O Tables 1 and 2 present the soil andgroundwater analytical results. <br />o No residual soil contamination remains in the unsaturated zone. The estimated lateral <br />and vertical extent of petroleum hydrocarbons in saturated soil and groundwater is shown <br />i <br />on Figures 3 and 4. <br />L0 Soil remediation methodology ,is described in section 3.3.1 .(Remedial Actions, Soil). <br />Petroleum hydrocarbon impacted soil was excavated from the site. The excavated soil <br />� was remediated by aerating on-site. Remediated soil, verified by laboratory analysis, <br />was used to backfill the excavation. <br />o Passive groundwater remediation is recommended Vito mitigate dissolved hydrocarbons <br />1�• beneath the site. Physical and chemical analysis indicate that biodegradation of <br />contaminants is naturally occurring in the subsurface. <br />It <br />'i <br />The shallow groundwater in the vicinity of the siteis not suitable for consumption or <br />jj irrigation and has limited beneficial use. 1 <br />I . <br />I 6.0 CONCLUSIONS AND RECOMMENDATIONS <br />Source removal excavation succeeded in removing from the subsurface all petroleum <br />hydrocarbon contaminated soil in the vadose zone. There is no contamination remaining in the <br />Y g <br />I vadose zone which could threaten beneficial uses of groundwater. <br />Contaminated groundwater beneath the site is of limited extent and has not migrated significantly <br />L 6 <br />off site. No separate phase product is present beneath the site. No existing water supply wells, <br />L <br />deeper aquifers, or surface waters are threatened by 4' dissolved petroleum hydrocarbon <br />contaminants beneath the site. It has been demonstrated by the SJCFCWCD that the general <br />quality of groundwater in the vicinity of the site is poor'',, and does not meet drinking water <br />L <br />groundze\ranuioklosure <br />12 <br />