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•' Case Closure Summary Page 2 <br />Leak Underground Fuel Storage Tank�ogram <br />III. Release and Site Characterization Information (continued) <br />Maximum Documented Contaminant Concentrations --Before and After <br />Cleanup <br />Does corrective action protect public health for current land use? YES <br />Site management requirements: NONE <br />Contaminant <br />Soil <br />(ppm) <br />Water (PPB) <br />Contaminant <br />Soil <br />(ppm) <br />Water <br />(PPB) <br />1 11 <br />Before <br />After <br />Before After <br />Before <br />After <br />Before <br />After <br />TPH (Gas) <br />350 <br />350 <br />*12000 <br />*12000 <br />Xylene <br />0.88 <br />0.88 <br />*1200 <br />*1200 <br />TPH (Diesel) <br />---- <br />---- <br />---- <br />---- <br />Ethylbenzene <br />3.2 <br />3.2 <br />* 55.0 <br />*55.0 <br />Benzene <br />1.3 <br />1.3 <br />*470 <br />*470 <br />Oil & Grease <br />---- <br />---- <br />---- <br />---- <br />Toluene <br />0.78 <br />0.78 <br />*36.0 <br />*36.0 <br />LEAD metals <br />---- <br />---- <br />---- <br />---- <br />MTBE <br />---- <br /><0.05 <br />---- <br /><10.0 <br />Other <br />Comments (Depth of Remediation, etc.): <br />EXCAVATION REMOVED THE BULK OF THE SOURCE AND THE GROUNDWATER <br />PLUME HAS ALWAYS <br />BEEN <br />LIMITED TO THE FORMER TANK PIT AREA. PASSIVE DEGRADATION SHOWN TO BE THE MOST COST EFFECTI <br />APPROACH. BENEFICIAL USES NOW AND IN THE FUTURE ARE PROTECTED. <br />*GRAB SAMPLE RESULTS* <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: NO <br />Number Decommisioned:00 <br />Number Retained: 02 <br />List enforcement actions taken: INITIAL DIRECTIVE LETTER <br />List enforcement actions rescinded: NONE <br />1 11 <br />V. Local Agency Representative Data <br />Name: DONNA HERAN Title: DIRECTOR, ENVIRONMENTAL HEALTH DIVISION <br />Signature: Date: <br />VI. RWQCB Notification <br />Date Submitted to RB: RB Response: <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 />Tq <br />