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r. <br /> 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 /> f <br /> ;Contaminant Soil (ppm) 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 x.050!11 Xylene 250.0 22.0 1 4.551FP x.0006 <br /> TPH (Diesel) " Ethylbenzene 43.0 0.62 4.55-FP <.0003 i <br /> Benzene x.150 <.10 4.551FP .0006 Oil & Grease <br /> Toluene 47.0 .x.10 4.551FP .0006 Heavy metals <br /> Other Other <br /> Comments (Depth of Remediation, etc.) : Soil contamination was not well characterized at <br /> j the initiation of remediation in May 1986. Soil(before) from piping sample on 9/17/91. <br /> Soil Er_ <br /> soil sampling X20' on 8/25/95. Groundwater(before) from MK4 on 8/25/86_ ._ <br /> - —_ _ <br /> Floating Product measured.Groundwater(after) from MW4 on 12/13/95. See remediation summary <br /> z <br /> a <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board <br /> f <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 /> i <br /> I <br /> Should corrective action be reviewed if land use changes? {Yes} NO 3 <br /> Monitoring/vapor extraction wells: 31 ,Number Decommisioned: 31 Number Retained: 0 <br /> List enforcement actions taken:- Central talley Regional 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 List enforcement actions rescinded: none 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 Age ncy'Representacive Data 1� <br /> ff <br /> : Donn Heran Title: Director of Environmental Healthature: -y�. '� Date: <br /> VI. RWQCB Notification <br /> Date Submitted to RB: 3/12/96, RB Response:No further action required <br /> RWQCB Staff Name:E. Thayer Title:Assoc. Engineer Date: 07/19/96' <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.yda. with conc.distributed from 2600ppm to <br /> to 1ppm TPH-g(10gal)and impacted groundwater was 1512cu.yds@25ppb(.003gal) . E.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 /> p <br />