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NIL <br /> tt base Closure Summary Page 2 <br /> Leakin<�� ,�derground Fuel Storage Tank P'` -ram <br /> III. Release and Site Characterization Information (continued)`_'. <br /> MaximumDocumented Contaminant Concentrations--Before ancl,tAfter Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil ' (ppm) Water (ppm) <br /> Before After Before After Before:':. After Before After <br /> TPH (Gas) 1500 210 5.7 c0.05 Xylene 39 29 1.0 c.0005 <br /> TPH (Diesel) Ethylbenzene 116.8 2.6 0.5 <.0005 1 <br /> Benzene 23 0.90 1.2 x.0005 Oil & Grease ,NA 77 NA NA <br /> Toluene 59 3.90 0.007 x.0005 Heavy metals Ni 49 13 NA NA <br /> Other Other MTBE '! X5.0 <br /> Comments (Depth of Remediation, etc.) : Ip <br /> (NOTE: WATER DATA IN PPM ABOVE CHART) .MW-2 HOTTEST GROUNDWATER HITS EVER ON 9/25/91 WITH <br /> B=1,600 UG/L, AND TPH-G AT 3,200 UG/L. NW-2 DESTROYED PROPERLY 11/7/91 AND AREA OVER- <br /> EXCAVATED.POST EXCAVATION SAMPLES PI-6 AND 10 NON DSTECT1 MW-'5 HOTTEST ACTIVE WELL <br /> CONSISTENTLY DECREASING GROUNDWATER LEVELS TO ND 8/31/95. 1� 1E <br /> IV. Closure !] <br /> Does completed corrective action protect existing beneficital ug'es per the Regional Board <br /> Basin Plan? YES <br /> J) <br /> Does completed corrective action protect potential benefia'ial uses per the Regional Board <br /> Basin Plan? YES <br /> Does corrective action protect public health for current land use? Yes <br /> I Site management requirements: NONE �I <br /> Should corrective action be reviewed if land use changes? il No <br /> Monitoring wells Decommisioned: YES Number Decommisioned: 6 Number Retained: 0 <br /> F. <br /> List enforcement actions taken: -Neff$` <br /> f �1 <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DONNATitle: DIRECTOR ENVIRONMENTAL HEALTH DIVISION <br /> Signature: Aate: <br /> gn <br /> VI. RWQCB Notification i <br /> Date Submitted to RB: 10/02/96 RB Response: CONCURRENCE, NO DISPUTE <br /> RWQCB Staff Name-.J. BRATHOVDE Title: Date: ;' 11/27/96 <br /> VII. Additional Comments, Data, etc. ]� <br /> DRASTIC GROUNDWATER CONTAMINATION DECREASE AFTER TANK PIT AND PIPING AREA <br /> r <br /> OVER-EXCAVATED. LINGERING GW CONTAMINATION IN ONLY MW-5', WHICH SHOWED STEADY DECREASE <br /> UNTIL FINALLY NON DETECT IN AUG 195 AND STILL ND FOR ALL, INCLUDING MTBE. RESIDUAL SOIL <br /> CALCULATIONS IN CLOSURE REPORT SHOW t ONE GALLON OF FUELIIN ALL OF SITE SOIL. NO WELLS <br /> ,f w <br /> OR RECEPTORS IN AREA. SITE PROBABLY TO BECOME 7-11 GAS ,STATION UPON CERTIFICATION. <br /> POST 30 DAY NOTE: CVRWQCB MEMO OF 11/27/96 CONCURRS WITHiNFA.!�.BY JAMES BENNETT. . . <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) i <br /> Exhibit N Page 2 of 2 <br />