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Case Closure Summary Page 2 <br /> Leakinc -nderground Fuel 'Storage Tank Pr .ram <br /> III. ,Release and Site Charac( � zation Information (continued)„ <br /> FtEai <br /> cumented Contaminant Concentrations•- Before and After Cleanup <br /> t Soil {ppm) Water {ppm} Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> as1300 a10 Xylene 1.3 29 <br /> TPH (Diesel) 19000 21000 Ethylbenzene .52 1 <br /> Benzene <.1 :143 oil & Grease <br /> Toluene a.l .174 Heavy metals <br /> Other Other <br /> Comments (Depth of Remediation, etc,) : T <br /> From 9/93 to 4/95 excavation of contaminated soil occurred in five phases in the area <br /> f the former tank locations. Soil samples from the bottom of the excavations in some <br /> areas 24'-25, deep and one area 361deep 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) No <br /> Does corrective action protect public health for current land use? (Yes) No <br /> Site management requirements: None <br /> J <br /> i <br /> Should corrective action be reviewed if land use changes? (Yes) No <br /> Monitoring wells Decommisioned: Yes No - Number Decommisioned: Number Retained: <br /> List enforcement actions taken: NOR 6/12/92 <br /> .k <br /> . 4 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna nran Title: Director of Environmental Health <br /> Signature: ��� Date: f �y <br /> VI. RWQCB Notification <br /> Date Submitted to RB: 12/9/96 RB Response: Concurrence ! <br /> RWQCB Staff Name: 3. Brathovde Title:Asso. Eng. Geo. Date: 1/02/97 <br /> VII. Additional Comments, Data, etc. f <br /> I <br /> SOIL ONLY <br /> 1 <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency <br /> as part of the officialsite file. (08/24/93.) ' <br /> Exhibit N Page 2 of 2 <br /> I <br /> ' 1 <br />