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Page 2 <br />Case Closure Summary <br />Leaking Underground Fuel Storage Tank Program <br />Maximum Documented Contaminant <br />Soil I (ppm) <br />TPH (Gas) 4,900 <br />NA` <br />NA <br />Before <br />TPH (Diesel) <br />3,600 <br />NA <br />NA <br />NA <br />NA <br />TPH (Motor Oil) <br />480 <br />NA <br />N 1 <br />1.5 <br />Benzene <br />4.1 <br />NA <br />NA <br />7.1 <br />17.5 <br />0.34 <br />Toluene <br />150 <br /><1.0 <br />NA <br />NA <br />Before and After Cleanup <br />GOnrafNnaoL <br />- -" <br />Beeffore <br />•• . <br />After <br />Before <br />After <br />Ethylbenzene <br />85 <br />NA <br />1.8 <br />14.2 <br />0.71 <br />2.40 <br />Xylenes <br />440 <br /><0.005 <br />NA <br />NA <br /><0.0005 <br /><0.0015 <br />MTBE <br />1,2 -DCA <br /><0.005 <br />NA <br />0.024 <br />0.0027 <br />Lead <br /><1.0 <br />NA <br />NA <br />NA <br />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, H8 Comments: -7 on 11/16/06 for TPH-mo, H9-54 on 11/15/06 for benzene, H10-45 on 11/15/06 for toluene, ethylbenzene, and <br />TBE and 1,2 -DCA, and Central Tank Area on 04/10/87 for lead. 'Soil after' concentrations <br />xylenes, H9-30 on 11/15/06 for M <br />ations are taken from sample MW -1 on 4/7/93 for TPH-g, MW -1 on <br />were not collected. The 'groundwater before' concentr <br />12/20/90 for benzene, toluene, ethylbenzene, and xylenes, MW -1 on 10124/1 1 for MTBE, and toluene, <br />a yl enzen05 for xylenes, <br />DCA. The'groundwater after' concentrations are taken from PZ -2 on 4/20111 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 />V. Local A enc Representative Data <br />Name:Donna Heran, REHS Title: Director <br />Signature: __. Date: 10/16/2012 <br />/I Oentral Valley Rcninnnl Wnfor rinaliht Cnntrnl Rnnrd (RR) Nntification <br />Date Submitted to RB: 12/12/2011 <br />Response Date: 12/21/2011 <br />RB Staff: James L.L. Barton <br />Title: Associate Engineering Geologist <br />Response: Concurrence <br />11 <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 />