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i <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) 47000. 11.0 80,000. X50 Xylene 27100 2.3 2,300. c0.5 <br /> TPH (Diesel) ---- ---- ---- ---- Ethylbenzene 4700. 0.036 3,600. c0.5 <br /> Benzene x.005 a.005 0.8 <0.5 Oil & Grease ---- ---- ---- <br /> Toluene 42.0 c.005 0.8 c0.5 Heavy metals ---- ---- --_- ---- <br /> Other Other <br /> Comments (Depth of Remediation, etc.)' : <br /> BULK OF IMPACTED SOIL REMOVED BY OVER-EXCAVATION. GROUNDWATER PLUMS HAS BEEN DECLINING <br /> SINCE COMPLETION OF REMEDIAL WORK AND HAS BEEN AT NONDETECTABLE LEVELS FOR LAST TWO <br /> QUARTERS. <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 /> F <br /> Does corrective action protect public health for current land use? YES <br /> Site management requirements: NONE <br /> i <br /> 5 <br /> Should corrective action be reviewediif land use changes? NO <br /> Monitoring wells Decommisioned: YES Number Decommisioned:06 TXumber Retained:00 <br /> List enforcement actions taken: INITIAL DIRECTIVE LETTER <br /> 4 <br /> List enforcement actions rescinded: NONE <br /> I: V. Local Agency Representative Data, <br /> Name: DONN HERAN Title: DIRECTOR, ENVIRONMENTAL HEALTH DIVISION <br /> Signature: a—yw,� _" Date: � b <br /> VI. RWQCB. Notification, <br /> Date Submitted to RB: 02-26-96 RB Response: CONCURRENCE <br /> RWQCB Staff Name: BRATHOVDE Title:ASSOC ENG GEOL Date: 04-05-96 <br /> VII. Additional Comments, Data, etc. <br /> i <br /> 's <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 of2 <br /> 3 <br />