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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) 7.4 7.4 <.0005 <.0005 Xylene : .016 .016 <.0005 <.0005 <br /> TPH (Diesel) 22,000 22,060 .130 ' <.050 Ethylbenzene .009 .009 <.0005 <.0005 <br /> Benzene <.005 <.005 <.0005 <.0005 Oil & Grease x <br /> Toluene <.005 <.005 <.0005 <.0005 Heavy metals <br /> Other Other <br /> Comments (Depth of Remediation, etc. ) : Residual left after the excavation attempt was <br /> further characterized and determined not to pose 'a threat to groundwater quality. Soil <br /> contamination in the basement area was characterized only. Soil before/after were the <br /> highest concentrations in either the basement or sidewalk area {see tank summary) <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board <br /> Basin Plan? (Yea) 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 f <br /> Should corrective action be reviewed if land use changes? Yes (NO)' <br /> Monitoring wells Decommis'ioned: (Yes)NO Number Decommisioned: 5 Number Retained: 0 <br /> List enforcement actions taken: NOR sent 4/22/91 and 9/20/91. PHS/EHD correspondence <br /> dated 3/11/94. <br /> List enforcement actions 'rescinded: none <br /> V. Local Agency Representative Data <br /> Name: Donna Heran Title: Director of Environmental Health <br /> Signature: Date: <br /> VI. RWQCB Notification <br /> Date Submitted to RB: 2/12/96 RB Response: Concurrence with no further action <br /> RWQCB Staff Name: Gordon Boggs Title:Program Coord. '•< Date: 4/5/96 <br /> VII. Additional Comments,i', Data, etc. <br /> The soil contamination characterized in the basement area was estimated by Dennis Dunn <br /> RG#4242 of IT as 16 cu-yds with ave. cone. of 12,036 ppm TPH-D and not expected to pose <br /> a threat to groundwater. The soil contamination in .the sidewalk area was- estimated by <br /> Dennis Dunn as 78 cu.yde with ave. conc of 2440.65 ppm TPH-D and not expected to pose <br /> a threat to groundwater. The conc, evidenced attenuate rapidly with greater depth. <br /> R <br /> This document and the related CASE CLOSURE LETTER; Shall be retained by the lead agency. <br />