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Exhibit N Page 1 of 2 <br /> 2 e <br /> Case Closure Summary Page , , <br /> Lem�:,,.��g Underground Fuel. Storage Tar` rogram <br /> III. Release and Site Cha' cterization Information (continue ) <br /> } <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 /> I.TPH (Gas) 5,40Q 320 3.6 .058 Xylene 710 .46 0.19 a.0005 <br /> TPH (Diesel) NA NA NA NA Ethylbenzene 120 .016 0.039 <br /> Benzene 7.0 40.05 3.10 0.0012 Oil & Grease NA NA NA NA <br /> Toluene 140 .0062 0.22 0.0012 Heavy metals LEAD 8. NA NA NA <br /> Other Other <br /> Comments (Depth of Remediation, etc.) : <br /> TANKS REMOVED AND SOIL .EXCAVATED TO APPROX. 15' BGS. SAMPLED IN STOCKPILE AND THEN AFTER. <br /> LINER PLACED AT 15' BGS AND ALONG THE VERTICAL WALLS, SOIL RETURNED TO PIT FOR.VAPOR <br /> EXTRACTION AT LATER DATE. NESTED AND UN-NESTED VAPOR WELLS (4) AND VAPOR PROBES (9) <br /> UTILIZED TO REMOVE SOIL VAPORS AT FIRST.WITH THERMAL DESTR THEN CARBON.MW-3 EXTRACTION TOJ <br /> SEWER. <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: YES INumber Decommisioned:5 Number Retained: 0 <br /> Vapor wells/Probes Decommisioned: YES/YES Number Deeommisioned:4/9 Number Retained:0/0 <br /> List enforcement actions taken: none <br /> l: - <br /> List enforcement actions rescinded: none <br /> E <br /> V. Local gency Representative Data <br /> Name: BQ REES Title: Director of Environruentai -Health <br /> Signature: �` Date: —`�— 7 <br /> VI. RWQCB Notification <br /> Date Submitted to RB: NOV 07, 1996 RB Response: CONCURRENCE WITH CLOSURE <br /> RWQCB Staff Name:J. BRATHVODE Title: Date: 27 NOV 1996 <br /> VII. Additional Comments, Data, eta. <br /> FOUR ONSITE MWS AND ONE OFFSITE MW DESTROYED UNDER EHD PERMIT ON FEB 6, 1997. ALL I� <br /> VAPOR WELLS AND PROBES AND HORIZONTAL LINES DESTROYED ALSO. STOCKPILED SOIL SAMPLED <br /> AND APPROVED LAB RESULTS INDICATED NON-DETECT FOR PETROLEUM AND SOIL HAULED TO ULTRA <br /> MAR INC. , FOR FILL. ALL UGT CONCERNS ANSWERED. II <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 />