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Exhibit N Page 1 of 2 <br />'F Case Closure Summary Page 2 <br /> Le ng Underground Fuel Storage Tai ?rogram <br /> ITI. Release and Site ChIftaterization Information (conti d) <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) 5,400 320 3.6 .058 Xylene 710 .46 0.19 <.0005 <br /> TPR (Diesel) NA NA - NA NA Ethylbenzens 120 .016 0.039 NA <br /> Benzene 7.0 <0.05 3.10 0.0012 Oil a Grease NA NA NA <br /> Toluene 140 .0062 0.22 0.0012 Heavy metals LEAD 8.2 NA NA NA <br /> Other lother <br /> Comments (Depth of Remediation, etc.) : <br /> TANKS REMOVED AND SOIL EXCAVATED TO APPROX 151 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 /> k UTILIZED TO REMOVE SOIL VAPORS AT FIRST WITH THERMAL DESTR THEN CARBON.MW-3 EXTRACTION TO <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 /> I" 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 Number Decommisioned:5 lNumber Retained: 0 <br /> Vapor wells/Probes Decommisioned: YES/YES Number Decommisioned:4/9 Number Retained:0/0 <br /> List enforcement actions taken: none <br /> List enforcement actions rescinded: none <br /> V. Local Agency Representative Data <br /> Name: REHS Title: Director of Ejwjronmental Health <br /> Signature: � Date: <br /> VI. RWQCB Notification <br /> 4 <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 /> v FOUR ONSITE MWS AND ONE OFFSITE MW DESTROYED UNDER EEa PERMIT ON FEB 6, 1997. ALL <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. fI <br /> F <br /> i <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 />