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Case closure Summary page 2 <br /> Leski� ,Underground Fuel Storage Tank gram , <br /> III. Release and Site Chardlirization Information (coatinue)k - <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> Contaminant Soil (ppm) Nater (ppm) Contaminant Soil (ppm) Nater (ppm) <br /> Before After Before After Before lifter Before After <br /> TPH (Gas) 96.096.0 ND ND Xylene .820 .820 BD ND <br /> SPH (Diesel) Ethylbenzene .550 .550 ND ND <br /> Benzene ,130 .130 ND ND Oil a Grease <br /> Toluene .180 .180 ND ND Heavy metals <br /> other Other <br /> Comments (Depth of Remediation, etc.) : Residual left after the tank removal as evidenced <br /> in sail boring B-3. Residual soil contamination has not been <br /> demonstrated to pose a threat to groundwater. Concentrations noted above are from soil <br /> boring, B3, and defined by MI and VN3. <br /> rP. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board <br /> Basin Plan? (Teo) No <br /> Does c=Wleted corrective action protect potential beneficial uses per the Regional Board <br /> Basin Plan? (Yes) No <br /> Does corrective action protect public health for current land use? (Teo) No <br /> Site management requirements: None <br /> Should corrective action be reviewed if land use changes? Teo (mo) <br /> monitoring wells Decommissioned: (Tes)lio Number Decommissioned:3 Number Retained: 0 <br /> List enforcement actions taken: NOR sent 3/23/93 <br /> List enforcement actions rescinded: none <br /> V. Local Agency Representative Data <br /> Name: Donna an Title: Director of SnvironvA ntal Health <br /> Signature: L�9_-IWA, Date: �[ <br /> VI. RNQCB Notification <br /> Date Smai <br /> ubtted to RB: RB Response: Sails only/No groundwater impact <br /> RM <br /> Staff Name: Q. Boggs Title: Program Manager Date: <br /> E <br /> VII. Additional Comma:ents, Data, etc. <br /> Ed K. Simonis, RG #4422 estimated that approximately 47 pounds of residual hydrocarbon <br /> mass remains within an area of 7,750 cubic feet at an average concentration of 48.5 ppm. <br /> Based on available monitoring data, it was determined that the mass was completely <br /> retarded through sorption or biodegradation. <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency <br /> as part of the official site file. (08/24/93) , <br /> Exhibit N Page 2 of 2 <br /> • t i <br />