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Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> III. Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 3000.0 27 .0 - - Xylene 420.0 14.0 - - <br /> TPH (Diesel) 210.0 150.0 - - Ethylbenzene ND@2.0 3.8 - - <br /> Benzene 50.0 ND@.25 - - Oil & Grease - - - - <br /> Toluene 270.0 0.60 - Lead ND05.0 - - <br /> Other EDB ND@5.0 - - - <br /> Comments (Depth of Remediation, etc.) : <br /> Soil samples (before) were collected at 9.5' at the time of tank removal. Soil samples <br /> (after) were collected at 25 ' on 10/10/90 after excavation was completed. Samples for <br /> Lead analysis collected from stockpiled soil on 10/22/91. Seasonal high DTW-40' (1986) <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 /> Should corrective action be reviewed if land use changes? Yes (NO) <br /> Monitoring wells Decommissioned: Yes No Number Decommissioned: Number Retained: <br /> List enforcement actions taken: NOR sent 6/26/90 and 1/14/91 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donn Heran, RENS Title: Director of PHS/EHD <br /> Signature: Date: <br /> VI. RWQCB Notification <br /> Date Submitted to RB: 6/20/95 RB Response: <br /> RWQCB Staff Name: G Boggs Title: Program Coord Date: <br /> VII. Additional Comments, Data, etc. <br /> The soil boring drilled July 6, 1993 to investigate residual contamination documented on <br /> 10/10/90 indicated that the residual soil contamination was limited and not expected to <br /> pose-a threat to groundwater. Residual estimated at 180 TPH in 12x22x5 area amounting <br /> to 3.6 gallons of diesel range petroleum hydrocarbons at 30' below ground surface. Based <br /> on the silt layer located at 25-30' and limited soil contamination a groundwater <br /> investigation was not warranted. Current DTW is approx. 601 . <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 />