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�41w3k <br /> 1 <br /> Case Closure Summary Page 2 <br /> DRAFT <br /> Leaking Onderground,Fuel Storage Tank Program <br /> III. Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentratioris Before and After Cleanup - <br /> Contaminant Soil (ppm) l Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 2,100 2,600 4.551FP <.050 Xylene 250.0 22.0- 4.55'FP <.0006 <br /> TPH (Diesel) 7thylbenzene 43.0 0.62 4.551FP .<.0003 <br /> Benzene <.150 <.10 4.551FP .0006 �Oil & Grease } <br /> Toluene 47.0 <.10 4.551FP .0006 Heavy metals <br /> Other Other <br /> Comments (Depth of Remediation, etc.) : Soil contamination was not well characterized at <br /> the initiation of remediation in May. 1986.' Soil (before) from piping sample on 9/17/91. <br /> Soil(after) from soil sampling @20' on 8/25,/95. 'Groundwater(before) from MW4 on 8/25/86 <br /> Floating Product measured.Groundwater(after) from MW4 on 12/13/95. See remediation summary <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 /> i <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/vapor extraction wells: 31 Number Decommisioned: 31 Number Retained: 0 } <br /> List enforcement actions taken: Central ValleyRegional Water Quality Control was lead <br /> regulatory agency until May 19, 1989 when PHS/EHD forwarded the NOR. Subsequently, an <br /> updated NOR was sent on January 14, 1991. <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 List enforcement actions rescinded: none ° 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: 3/12/96 RB Response: <br /> RWQCB Staff Name:J.Brathovde Title:Eng.Geologist Date: <br /> VII. Additional Comments, Data, Remediation Summary, etc. <br /> Remediation consisted of free product removal (760gal) groundwater extract. (total treated <br /> was 1.6 million gal) and soil vapor extraction (567 gal) . ' The release was estimated at <br /> at 1366 gallons of product with only 10 gallons estimated to remain. E.Simonis-RG4422 <br /> estimated the vol. of impacted soil was 450cu.yds. with conc.distributed from 2600ppm to <br /> to 1ppm TPH-g(10gal)and impacted groundwater was 1512cu.yds@25ppb(.003gal) . B.Simonis <br /> indicated that residual contamination would not significantly affect beneficial uses. <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency. <br />