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h <br /> b. - Case Closure Summary Page 2 <br /> Leakiu Underground Fuel Storage Tank Ugram <br /> III. Release and Site 'Charac erization Information (continued) <br /> rj4ax7inmum Documented Contaminant Concentrations--Before and After Cleanup <br /> m Contaminant Soil (ppm) Water (ppm) <br /> nant Soil (ppm) Water (ppm) Before After Before After <br /> Before After Before After <br /> H (Gas) 1300 <10 Xylene 1..3 29 <br /> Ethylbenzene ..52 1 <br /> TPH (Diesel) 19000 21000 Oil & Grease <br /> Benzene c.l .43 <br /> Toluene c.l .74 Heavy metals <br /> Other Other <br /> Comments (Depth of Remediation, etc•) : <br /> From 9/93 to 4/95 excavation of contaminated soil occurred in five phases in the area <br /> € the former tank locations. Soil samples from the bottom of the excavations in some <br /> areas 24' -25' deep and one area 36'deep were non-detect. Diesel contamination remains <br /> laterally as deep as �29' but the areal extent is minimal as shown by soil samples <br /> collected from the soil borings drilled in 5/96. After results above are sidewall sample. <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) Na <br /> Does corrective action protect public health for current land use? (Yes) No <br /> Site management requirements: None <br /> Should corrective action be reviewed if land use changes? (Yes) No <br /> Monitoring wells Decommisioned: Yes No Number Decommi.sioned: Number Retained: <br /> List enforcement actions <br /> taken. NOR 6/32/92 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagozio Title: Supervising REHS <br /> Signature: Date: <br /> Vi. RWQCB Notifica ion <br /> Date Submitted to RB; RB Response: <br /> RWQCB Staff Name: Title: Date: <br /> VII. Additional Comments, Data, etc. <br /> SOIL ONLY <br /> This document and the related CASE CLOSURE LIETT}ER, 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 />