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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) <.050 Xylene <.010 ND <.010 <.0003 <br /> TPH (Diesel) 35051 2,400 <.050 Ethylbenzene <.010 ND <.010 <.0003 <br /> Benzene <.010 ND <.010 <.0003 Oil & Grease <br /> Toluene <.010 .048 <.010 <.0003 Heavy metals <br /> Other Other <br /> Comments (Depth of Remediation, etc.) : High/Low DTW from 2/24/96 prior to destruction. <br /> soil (before) collected on 3/23/89 at tank removal. Soil (after) collected on 8/25/89 <br /> following excavation attempt. Water (before) collected on 3/23/89 at tank removal. <br /> Water (after) collected on 7/15/93. <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: Stockpiled soil should be properly characterized and <br /> disposed. Residual soil contamination should be evaluated. <br /> Should corrective action be reviewed if land use changes? (Yes) No <br /> Monitoring wells Decommissioned: (Yes)No Number Decommissioned:2 Number Retained: 0 <br /> List enforcement actions taken: NOR sent 07/05/89, 01/1.4%91 and 04/01/92. Correspondence <br /> initiating enforcement sent on 06/07/90, 09/20/90, 04/22/93, 06/20/94, and 01/24/96. <br /> Office hearing were held on 10/23/90, 07/09/93, 08/18/93 <br /> List enforcement actions rescinded: none <br /> V. Local Agency Representative Data <br /> Name: Donna Heran Title: Director <br /> Signature: Date: 3- �9 <br /> VI. RWQCB Notification <br /> Date Submitted to RB: RB Response: Soils only/No groundwater impact <br /> RWQCB Staff Name: G. Boggs Title: Program Manager Date: <br /> VII. Additional Comments, Data, etc. <br /> PHS/EHD requested that the residual soil contamination be estimated and evaluated to <br /> determine the threat to groundwater. Based on available information, the residual does <br /> not appear to pose a significant threat. The stockpiled soil was also not re-sampled as <br /> requested, up to 660 ppm TPH-d was evidenced. See site management requirements. <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 /> 1 <br /> Exhibit N Page 2 of 2 <br /> i <br /> --- -- ,- . <br />