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lase Closure Summary Page 2 <br /> Leak nderground Fuel Storage Tank ram <br /> III. Release and Site CharaL erization Information (continue <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) <.005 <.005 <5.0 <5.0 Xylene 3.1 .0016 <.0005 <br /> TPH (Diesel) 11,000 1.2 <.0005 Ethylbenzene .76 .0005 <.0005 <br /> Benzene .05 .0007 <.0005 Oil & Grease NA <br /> Toluene .0034 .0005 <.0005 Heavy metals NA <br /> Other lOther NA <br /> Comments (Depth of Remediation, etc.) : <br /> NO ACTIVE REMEDIATION PROPOSED OR CONDUCTED AT SITE. NO CONFIRMATION SOIL BORINGS DONE <br /> AT PREVIOUS SOIL AREAS WHERE TPH-D CONTAMINATION DETECTED. LATERAL AND VERTICAL SOIL <br /> ZERO LINE @ LIMITED DEPTHS ONLY. CONSULTANT CLAIMS GW/TPHD IN MW-3 "ANOMALOUS" AND MAYBE <br /> ONLY CONCERN. MW-3 TPHD HITS <100 UG/L AND NO PATTERN TO RISING OR FALLING DTW LEVELS. =J, <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 NOW. <br /> Should corrective action be reviewed if land use changes? Yes <br /> Monitoring wells Decommisioned: No Number Decommisioned: Number Retained: 4 <br /> List enforcement actions taken: NOR,OCT 29, 1991 <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name:DONNA HERAN / MARGARET LAGORIO Title: DIRECTOR PHS-EHD / LOP SUPERVISOR <br /> Signature: �� Date: 12/17/96 <br /> VI. RWQCB Notificati n <br /> Date Submitted to RB: RB Response: <br /> RWQCB Staff Name: Title: Date: <br /> VII. Additional Comments, Data, etc. <br /> LATEST MW INSTALLATION, MW-4, INSTALLED 8/26/96,OFF-SITE TO THE WEST DID NOT DETECT ANY <br /> SOIL OR GROUNDWATER CONTAMINATION. THIS INVESTGATION COMPLETED CONFIRMED NO OFF-SITE <br /> IMPACT AND DELINEATED GW PLUME. NO RECEPTORS WITHIN 20001 . NO LAND USE CHANGE PROPOSED. <br /> MW-3 CLOSEST TO HOTTEST TPHD RESIDUAL SOIL AND NOT IMPACTED SINCE JUNE 1996, AND SEP 95. <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 />