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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 /> LMaximum Documented Contaminant Concentrations -Before and After Cleanup <br /> Contaminant Soil Before (ppm) Water (ppm) Contaminant Soil Before .(ppm) Water (ppm) ! <br /> After Before After _ After Before After <br /> TPN (Gas) 760 400 140 <.05 Xylenes 340 39 18 <.001 I <br /> TPH (Diesel) 4800 1800 1300 .0.068 Ethylbenzene 96 10 3.6 <.0005 <br /> Benzene 27 5.4 11 <.0005 Oil&Grease NA NA NA NA <br /> Toluene 210 16 18. <.0005 Heavy Metals 11 8 NA NA <br /> MTBE NA <5 0.4 <.0005 l <br /> LComments: "SOIL BEFORE" results from tank pull samples on 10128188. "SOIL AFTER"results from soil borings in and <br /> around the tank pit area (depth of 10 feet bs6, highest cone. sample results)on 12119197. "WATER BEFORE"results from <br /> soil boring grab samples. "WATER AFTER"results from groundwater monitoring wells samples from June 30, 2008. No <br /> remediation has been performed at this site. Soil Va or samples were collected on 4130108; results were all non-detect. <br /> LIV. Closure II <br /> i <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan?YES <br /> Does completed corrective action protect potential beneficial uses per the Regional Board:Basin Plan? YES <br /> Does corrective action protect public health for current land use? YES <br /> Site management requirements: NONE <br /> Should corrective action be reviewed if land uses changes?YES <br /> LMonitoring/Vapor wells decommissioned: NO Number Decommissioned: 0 Number retained: 3 <br /> LList enforcement actions taken: NOR <br /> List enforcement actions rescinded: NONE <br /> .I <br /> V. Local Agency Representative Data <br /> Name: MARGARET LAGORIO, REHS Title: PROGRAM COORDINATOR, UNIT IV <br /> Signature: Date: Ll 0/6'8 <br /> BVI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> i <br /> Date Submitted to RB: Response Date: <br /> RB Staff: JAMES L.L. BARTON, PG Response. <br /> Title: ENGINEERING GEOLOGIST <br /> :'VII. Additional Comments, Data, etc. <br /> Data, etc. <br /> Risk Assessment Report dated 08/29/08 documents results of the soil vapor survey and Johnson& Eftinger <br /> risk assessment model which determine that the residual contamination at this site poses no;unacceptable risk to human <br /> health or the environment. Compliance with public participation requirements in sections 2728 of the California Code of <br /> Re ulations has been met. <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the official! <br /> "site file, <br /> x l <br />