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al f4 � <br /> Release and Site Characterization Information (Continued) <br /> Maximum Documented Contaminant Concentrations -.- Before and After Cleanup <br /> Im Contaminant Soil m Water b Contaminant Soil m Water b <br /> Before After Before After Before After Before After <br /> TPH Gas 4300 unk 230 <50 1 Xylenes 270 unk 87 <0 5 <br /> TPH Diesel ND unk NA NA Eth (benzene 37 unk 35 <0 5 <br /> Benzene 10 unk 57 <0 5 <br /> Toluene 58 unk 12 <0 5 <br /> Other <br /> Comments (Depth of Remediation, etc ): Hydrocarbons were removed from soil during a two month <br /> vapor extraction pilot test Since completion of the test, hydrocarbons have been detected in ground water <br /> only occasionally and at very low concentrations when detected There is no evidence of a hydrocarbon <br /> plume in the ground water Concentrations in water listed above under"After" are based on data from the <br /> most recent sampling event and are indicative of current site conditions <br /> IV Closure <br /> Does coin leted corrective action protect existing beneficial uses per the Regional Board Basin Plans es No <br /> Dore <br /> completed corrective action protect potential beneficial uses per the Re conal Board Basin Plans Yes No <br /> Does corrective action protect public health for current land uses Ye No <br /> Site management requirements None required <br /> Should corrective action be reviewed if land use chan es? Yes No <br /> Monitoring wells decommissioned Yes No Number decommissioned 0 Number retained 4 <br /> List enforcement actions taken None <br /> List enforcement actions rescinded <br /> V Local Agency Representative Data <br /> Eame Title <br /> 1 nature Date <br /> VI RWQCB Notification <br /> Date submitted to RB RB response <br /> RWQCB staff name Title Date <br /> •) <br /> CCF101094 2 of 3 <br />