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r <br /> 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) 112.0 2.5 <50.0 <50.0 Xylene 11.3 0.68 3.9 <0.5 <br /> TPH (Diesel) ---- ---- ---- ---- Ethylbenzene 0.30 0.12 1.2 <0.5 <br /> Benzene 0.57 <.005 3.5 <0.5 Oil & Grease ---- ---- ---- ---- <br /> Toluene 0.50 0.26 0.91 1.5 Heavy metals 4.0 ---- ---- ---- <br /> MTBE ---- ---- ---- <5.0 Other <br /> Comments (Depth of Remediation, etc.) : <br /> BULK OF IMPACTED SOIL REMOVED BY OVER-EXCAVATION IN 1987. BORINGS INSTALLED IN 1992 <br /> INDICATE RESIDUAL SOIL CONTAMINATION LIMITED. GROUNDWATER ONLY SHOWS INTERMITTENT, VERY <br /> LOW LEVELS OF CONTAMINATION. <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:04 Number Retained: 00 <br /> List enforcement actions taken: INITIAL DIRECTIVE LETTER <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DONNARERAN Title: DIRECTOR, ENVIRONMENTAL HEALTH DIVISION <br /> Signature: Date: <br /> VI. RWQCB Notification <br /> Date Submitted to RB: 04-16-96 RB Response: NONE <br /> RWQCB Staff Name:BRATHOVDE Title: CHG 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 />