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� I <br /> + Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> III. Release and Site Characterization Information (continued) <br /> J <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> 3 Contaminant Soil (ppm) Water (ppm) Contaminant SoilHte)r <br /> ter (ppm) <br /> i Before After Before After Beforfore After <br /> 3 <br /> a TPH (Gas) 2,100 2,600 4.551FP <.050 Xylene 250.055'FP <.0006 <br /> TPH {Diesel} Ethylbenzene 43.055'FP <.0003 <br /> Benzene <.150 <.10 4.551FP .0006 Oil & Grease <br /> Toluene 47.0 <.10 4.55'FP .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 /> k <br /> Does corrective action protect public health for current land use? (Yes) No <br /> Site management requirements: None I <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 Valley Regional Water Quality Control was lead <br /> s <br /> regulatory agency until May 19, 1989 when PHS/EHD forwarded the NOR. Subsequently, an t <br /> updated NOR was sent on January 14, 1991. <br /> List enforcement actions rescinded: none . <br /> V. Local Agency Representative Data <br /> Name: Donn Heran Title: Director of Environmental Health <br /> Signature: �-� s 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 /> r <br /> estimated the vol. of impacted soil was. 450cu.yds. with conc.distributed from 2600ppm to <br /> to 1ppm TPH-g(10ga1)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 />