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�r <br /> Case Closure Summary <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 /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 9,900 <1 250 19 Ethylbenzene 91,700 <0.005 5.7 0.74 <br /> TPH(Diesel) 3,900 NA 23 NA Xylenes 875,000 <0.005 25 0.221 <br /> Benzene 29 <0.005 28 <0.0005 MTBE 0.064 <0.005 0.18 <0.001 <br /> Toluene 66,800 <0.005 52 0.0078 1,2-DCA <0.005 <0.005 0.071 <0.0005 <br /> Lead 69.3 NA NA NA <br /> Comments: 'Soil Before' concentrations for TPH-g and benzene are from sample 132-35 on 07125196, TPH-d and MTBE <br /> from VW2-20 on 06116197, toluene and ethylbenzene from T1-E-17 on 03118196, xylenes from T2-N-18 on 03/18196, 1,2- <br /> DCA from MW10-25 on 07102198, and lead from 9 & 10 composite on 03118196. 'Soil After'concentrations were taken <br /> from B-12 @ 5, 20 and 30 feet bsg on 08102110. 'Water Before' concentrations for TPH-g and toluene are from AW-2A on <br /> 09119101, TPH-d from B3 on 12119196, benzene and ethylbenzene from MW-6 on 10122198, xylenes from AW-2A on <br /> 03/08102, MTBE from MW-3 on 10/16197, and 1,2-DCA from MW-2 on 10106/04. 'Water After' concentrations are from AW_ <br /> 2A on 06108111. 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: Yes Number Decommissioned: 33 Number retained: 0 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: None <br /> V. Local Aaencv Representative Data <br /> Name: Donna Heran, RENS Title: Director <br /> Signature: Date: May 13, 2013 <br /> VI Central Valle Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: June 26, 2012 Response Date: July 12, 2012 <br /> RB Staff: James L.L. Barton Response: Concurrence <br /> Title:Associate En ineerin Geologist <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 />