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Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> III. Release and Site Characterization 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) 8.7 8.7 110.0 <50 Xylene 0.31 0.31 11.0 <0.5 <br /> TPH (Diesel) 88.0 88.0 120.0 <50 Ethylbenzene 0.12 0.12 3.8 <0.5 <br /> Benzene 0.024 0.024 4.1 <0.5 Oil & Grease ---- ---- ---- ---- <br /> Toluene 0.029 0.029 10.0 <0.5 LEAD metals 6.3 ---- ---- ---- <br /> MTBE ---- ---- ---- <2.5 Other <br /> Comments (Depth of Remediation, etc.) : <br /> LIMITED MASS OF HYDROCARBONS IN SUBSURFACE BENEATH TANK PIT AREA. GROUNDWATER HAS SHOWN <br /> NON DETECTABLE LEVLES FOR SOME TIME. <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? YES <br /> Monitoring wells Decommisioned: 00 Number Decommisioned:00 Number Retained: 03 <br /> List enforcement actions taken: NONE <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DONNA RAN Title: DIRECTOR, ENVIRONMENTAL HEALTH DIVISION <br /> Signature: Date: 36 <br /> VI. RWQCB Notification <br /> Date Submitted to RB: 06-03-96 RB Response: NONE <br /> RWQCB Staff Name: BRATHOVDE Title:ASSOC ENG GEOL 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 />