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J '111.�`Release and Site Characterization Information Continued <br /> Maximum Documented Contaminant Concentrations -- Before and After Cleanup <br /> Contaminant Soil m Water m Contaminant Soil m Water m <br /> . Before After Before After Before After Before After <br /> TPH (Gas) 3,900 6.1 0.660 ND Xylene 47 0.066 0.065 ND <br /> TPH (Diesel) ND ND — — Ethylbenzene 410 0.73 0.00057 ND <br /> Benzene 7.4 0.57 0.096 ND Oil and Grease ND ND — <br /> Toluene 110 0.91 0.0059 ND Heavy metals(Total Lead)) — 2.9 — — <br /> Other I Other — — — — <br /> Comments (Depth of Remediation, etc.): <br /> 1) Slightly higher benzene concentration detected in soil sampling, collected from MW 1 @ 27.5 and 32.5 feet. <br /> 2) Excavation was conducted in the fuel tank pit to 26 feet below grade. <br /> 3) "After"water concentrations reflect previous 2 years of sampling.Some minor BTEX concentrations appear to be anomalous <br /> rased on the field&trip blank results. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes No <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes No <br /> Does corrective action protect public health for current land use? Yes No <br /> Site management requirements: Properly destroy all monitoring wells in accordance with California Well Standards Bulletin 7490. <br /> Should corrective action be reviewed if land use changes? Yes No <br /> Monitoring wells Decommissioned: Yes No Number Decommissioned: NIA Number Retained: 9 <br /> List enforcement actions taken: None <br /> List enforcement actions rescinded: NOT APPLICABLE <br /> V. Local Agency Representative Data <br /> Name: Title: <br /> Signature: Date: <br /> V1. RWQCB Notification <br /> Date Submitted to RB: RS Response: <br /> RWQCB Staff Name: Title: Date: <br /> Ill. Additional Comments, Data, etc. <br /> s <br /> This doWmeM and the rotated CASf CLOSURE LETTER,shall be retained by the lead agenry as part of the otf!cW site lite. PAGE 2 OF 2 <br />