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u <br />Case Closure Summary Page 2 <br />Leaking Underground Fuel Storage Tank Program <br />III. Release and Site Characteri7afinn Infnrm.finn a <br />Maximum Documented Contaminant Concentrations - - Before and After Cleanup <br />Contaminant <br />Soil <br />(ppm) <br />Water <br />(ppm) <br />Contaminant <br />Soil <br />(ppm) <br />Water <br />(ppm) <br />TPH (Gas) <br />Before <br />4,900 <br />After <br />NA <br />Before <br />196 <br />After <br />Before <br />After <br />Before <br />After <br />TPH (Diesel) <br />3,600 <br />NA <br />NA <br />18 <br />NA <br />Ethylbenzene <br />Xylenes <br />85 <br />440 <br />NA <br />NA <br />1.8 <br />0.71 <br />TPH (Motor Oil) <br />480 <br />NA <br />NA <br />NA <br />MTBE <br /><0.005 <br />NA <br />14.2 <br /><0.0005 <br />2.40 <br /><0.0015 <br />Benzene <br />4.1 <br />NA <br />7.1 <br />1.5 <br />1,2 -DCA <br /><0.005 <br />NA <br />0.024 <br />0.0027 <br />Toluene <br />150 <br />NA <br />17.5 <br />0.34 <br />Lead <br /><1.0 <br />NA <br />NA <br />NA <br />Comments: The'soil before' concentrations are taken from sample H3-25 on 11/17/06 for TPH-g, H10-40 on 11/15/06 for <br />TPH-d, 1-18-7 on 11/16/06 for TPH-mo, 1-19-54 on 11/15/06 for benzene, H10-45 on 11/15/06 for toluene, ethylbenzene, and <br />xylenes, 1-19-30 on 11/15/06 for MTBE and 1,2 -DCA, and Central Tank Area on 04/10/87 for lead. 'Soil after' concentrations <br />were not collected. The'groundwater before' concentrations are taken from sample MW -1 on 4/7/93 for TPH-g, MW -1 on <br />12/20/90 for benzene, toluene, ethylberzene, and xylenes, MW -1 on 10/24/01 for MTBE, and MW -1 on 11/10/05 for 1,2 - <br />DCA. The 'groundwater after' concentrations are taken from PZ -2 on 4/20/11 for TPH-g, toluene, ethylbenzene and xylenes, <br />PZ -1 on 4/20/11 for benzene, MW -1 on 4/20/09 for MTBE, and MW -7 on 4/21/11 for 1,2 -DCA. NA — not analyzed <br />IV. Closure <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 use changes? Yes <br />Monitoring/Vapor wells decommissioned: No Number Decommissioned: 0 Number retained: 23 <br />List enforcement actions taken: NOR <br />List enforcement actions rescinded: None <br />V. Local Agency Representative Data <br />Name: Adrienne Ellsaesser, REHS <br />Title: Acting Program Coordinator <br />Signature: <br />Date: / <br />VI. Central Valley Reqional Water Quality Control Board (RB) Notification <br />Date Submitted to RB: <br />Response Date: <br />RB Staff: James L.L. Barton <br />Title: Associate Engineering Geologist <br />Response: <br />VII. Additional Comments, Data, etc. <br />This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br />