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--Case Closure Summary Page 2 <br /> Leakin' Tnderground Fuel Storage Tank P ram <br /> III. Release and Site Characization Information (continued <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> Contaminant Soil (ppm) Water (PPB) Contaminant Soil (ppm) Water (PPB) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 3,800. 6.0 80,000. 160. Xylene 430.0 0.16 2,000. 3.9 <br /> TPH (Diesel.) ---- ---- ----- ---- Ethylbenzene 77.0 0.10 280.0 <0.5 <br /> Benzene 10.0 <.005 6,500. 1.5 Oil a Grease ---- ---- -- ---- <br /> Toluene 160.0 <.005 2,800. 0.8 Heavy metals 6.10 <5.0 ----- ---- <br /> Other Other <br /> Comments (Depth of Remediation, etc.) : <br /> BULK OF IMPACTED SOIL REMOVED BY OVER-EXCAVATION. MOST OF FORMER GROUNDWATER PLUME <br /> i <br /> ALSO EXCAVATED AS THE EXCAVATION OCCURRED AT TIME OF LOW GROUNDWATER LEVEL. RESIDUAL <br /> LEVELS REMIANING = 11.5 POUNDS TOTAL PETROLEUM HYDROCARBONS AS GASOLINE (1.9 GALLONS) . <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board <br /> Basin Plan? Yes <br /> Does completed corrective action protect potential beneficial uses per the Regional Board <br /> Basin Plan? Yes <br /> Does corrective action protect public health for current land use? Yes <br /> Site management requirements: NONE <br /> Should corrective action be reviewed if land use changes? No <br /> Monitoring wells Decommisioned: Yes Number Decommisioned:10 Number Retained: 3 <br /> List enforcement actions taken: INITIAL DIRECTIVE LETTER <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DO A HERRN itle: DIRECTOR, ENVIRONMENTAL HEALTH DIVISION <br /> signature: Date: 04-22-94 <br /> VI. RWQCB Notification <br /> Date Submitted to RB: RB Response: <br /> RwQCB Staff Name: Title: Date: <br /> VII. Additional Comments, Data, etc. <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 />