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i <br /> it �5 <br /> �e'ase Closure Summary Page 2 <br /> Leakinczderground Fuel Storage Tank Pf 'ram <br /> III. Release and Site Characterization Information (conti?nued)` <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> k <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil I (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 1500 210 5.7 c0.05 Xylene 1�3.9 29 1.0 c.0005 <br /> TPH (Diesel) Ethylbenzene ;I 6.81 2.6 0.5 c.0005 j <br /> Benzene 23 0.90 1.2 c.0005 Oil & Grease 11 NA 77 NA NA <br /> Toluene 59 3.90 0.007 c.0005 other metals Nii49;` 13 NA <5NA <br /> OtheNTBEr <br /> Comments (Depth of Remediation, etc.) : jl I <br /> (NOTE: WATER DATA IN PPM ABOVE CHAR <br /> T) .MW-2 HOTTEST GROUNDWATER HITS EVER ON 9/25/91 WITH <br /> i Y <br /> B=1,600 UG/L, AND TPH-G AT 3.200 UG/L. MW-2 DESTROYED PROPERLY 11/7/91 AND AREA OVER- <br /> � I+ i <br /> EXCAVATED.POST EXCAVATION SAMPLES PI-6 AND 10 NON DETECT. 14W 5 HOTTEST ACTIVE WELL <br /> CONSISTENTLY DECREASING GROUNDWATER LEVELS TO ND 8/31/95.1- <br /> IV. <br /> /31/95!IV. Closure �I R <br /> i Does completed corrective action protect existing beneficial uses per the Regional Board <br /> Basin Plan? YES k <br /> Does completed corrective action protect potential beneficial uses per the Regional Board k <br /> Basin Plan? YES ji <br /> Does corrective action protect public health for current; land�use? Yes <br /> Site management requirements: PROPERLY DESTROY EXISTING 4 MONITORING WELLS AFTER 30 DAY <br /> CVRWQCB COMMENT PERIOD AND ISSUE SITE CERTIFICATION LETTER. I <br /> i <br /> Should corrective action be reviewed if land use changes? No <br /> r <br /> Monitoring wells Decommisioned: NOT YET Number Deconmlisioned: 2 Number Retained: 0 <br /> List enforcement actions taken: NONE �f p <br /> List enforcement actions rescinded: NONE <br /> �j <br /> V. Local Agency Representative Data I <br /> Name: DONNA HERAN Title: DIRECTOR} ENVIRONMENTAL HEALTH DIVISION <br /> Signature: I Dater: <br /> VI. RWQCB Notification <br /> Date Submitted to RB: 9/27/96 RB Response: �} <br /> RWQCB Staff Name:J. BRATHOVDE Title: iDate!. j <br /> VII. Additional Comments, Data, etc. <br /> DRASTIC GROUNDWATER CONTAMINATION DECREASE AFTER TANK PIT AND PIPING AREA <br /> .j <br /> F <br /> OVER-EXCAVATED. LINGERING GW CONTAMINATION IN ONLY MW,-5, WHICH SHOWED STEADY DECREASE j <br /> ` 1 <br /> UNTIL FINALLY NON DETECT IN AUG 195 AND STILL ND FOR ALL, INCLUDING MTBE. RESIDUAL SOIL <br /> i <br /> CALCULATIONS IN CLOSURE REPORT SHOW c ONE GALLON OF FUEL IN� ALL OF SITE SOIL. NO WELLS <br /> OR RECEPTORS IN AREA. SITE PROBABLY TO BECOME 7-11 GAS STATION UPON CERTIFICATION. <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) II <br /> Exhibit N Page 2 of 2 <br />