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Case Closure. SummaryPage 2 <br /> Leaking underground Fuel Stora a Tank Program <br /> III. Release and Site Characterization Information ( ontinued) <br /> Maximum Documented Contaminant Concentrations--Befor and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before Ater Before After Before After Before After <br /> TPH (Gas) 3,900 6.2 0.660 ND Xylene 1.3 1.3 0.065 ND <br /> TPH (Diesel) ND ND Ethylbenze a 47.0 .066 0.00057 ND <br /> Benzene 7.4 1.9 0.096 ND Oil & Grea a ND ND <br /> Toluene 110 0.91 0.0059 ND Heavy metals - 2.9 - <br /> Other - - - - Other - _ <br /> Comments (Depth of Remediation, etc.) : <br /> I. SOIL BORING (MW1)CONTAINED HIGHEST BENZENE RESIDII LEFT IN PLACE. MWl HAD HISTORY OF <br /> HIGHEST CONTAMINANT CONCENTRATIONS IN GROUNDWATER <br /> 2. EXCAVATION WAS CONDUCTED IN THE FUEL TANK PIT TO 6 FEET BELOW GRADE. <br /> 3. "AFTER" WATER CONCENTRATIONS REFLECT PREVIOUS 2 S OF SAMPLING. SOME MINOR BTEC <br /> CONCENTRATIONS APPEAR TO BE ANOMALOUS BASED ON TH FIELD & TRIP BLANK RESULTS. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board <br /> Basin Plan? (Yes) No <br /> Does completed corrective action protect potential beneficial uses per the Regional Board <br /> Basin Plan? (Yes) No <br /> Does corrective action protect public health for current land use? (Yes) No <br /> Site management requirements: <br /> Should corrective action be reviewed if land use changes? Yes (No) <br /> Monitoring wells Decommisioned: (Yes) No Number D commisioned: 9 TNumber Retained: 0 <br /> List enforcement actions taken: LEVEL ONE, NOR AND 5 TE LETTER <br /> List enforcement actions rescinded: <br /> 11 1 <br /> V. Local Agency Representative Data <br /> Name: DONNA HE Title: DIRECTOR OF ENVIRONMENTAL HEALTH <br /> Signature: Date: _ 6 <br /> VI. RWQCB Notification <br /> Date Submitted to RB: RB Response: <br /> RWQCB Staff Name: Title: Date: <br /> VII. Additional Comments, Data, etc. <br /> MW'S #1, #2 AND #6 HAD HISTORY OF GROUNDWATER CONTAMINATION, MW #1 LOCATED DOWNGRADIENT <br /> F RELEASE WAS THE MOST IMPACTED <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 />