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Case Closure Summary Page 2 ` r <br /> Lk Bing Underground Fuel Storage Tank Prog.,i � , <br /> III. Release and Site Characterization Information (continued) U <br /> Maximum Documented Contaminant Concentrations - - Preliminary and Subsequent Soil Investigations <br /> Contaminant Soil Subseq Water Subseq Contaminant Soil Subseq Water Subseq <br /> Prelim. Investi- Prelim. Investi- Prelim. Investi- Before Investi- <br /> (in ppm) gation gation (in ppm) gation gation <br /> TPH(Gas) 691 <0.4 ---- ---- MTBE --_- <0.005 ---- --._ <br /> TPH (Diesel) 16,700 2.57 ---- ---- Oxygenates ---- <0.005 ---- ---- <br /> Benzene <0.150 <0.005 ---- ---- Mineral Spirits ---- ____ ____ _--- <br /> Toluene <0.150 <0.005 ---- ---- Oil &Grease ---_ ____ <br /> Ethylbenzene 0.536 <0.005 ---- ---- Heavy Metals ---- --__ ---_ --_, <br /> Xylenes 2.740 0.0058 ---- ---- Lead ____ ---- ____ _--- <br /> Comments (Depth of Remediation, etc.): Tanks were removed between 1989 and 1997. Investigation shows limited soil <br /> contamination in the area of UST 1 and 7 and remote piping areas. Beneficial uses of groundwater are protected now and <br /> in the future. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes <br /> Does corrective action protect public health for current land use? Yes <br /> Site management requirements: none <br /> Should corrective action be reviewed if land use changes? Yes <br /> Monitoring wells decommissioned: No Number Decommissioned: 0 Number retained: 0 <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervising REHS <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: March 23, 2000 Response Date: <br /> RB Staff: Marty Hartzell Response: <br /> Title: Assoc. Eng. Geologist <br /> VII. Additional Comments, Data, etc. <br /> SOIL ONLY <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the <br /> official site file. (08/24/93) Exhibit N Page 2 of 2 <br />