SITE INFORMATION AND CORRESPONDENCE FILE 2

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Ill. Release and Site Characterization Information (continued Maximum Documented Contaminant Concentrations-- Before and After Cleanup Contaminant Soil Before (ppm) Water (ppm) Contaminant Soil Before (ppm) Water (ppm) After Before After After Before After TPN(Gas) 42,900 NA 140 0.72 Xylene 980 NA 20 0.0049 TPH(Diesel) 44 NA <0.05 NA Ethylbenzene 180 NA 2.7 0.026 Benzene 63 NA 8.3 <0.0005 1,2-DCA <0.0050 NA <0.005 NA Toluene 500 NA 24 <0.0005 Heavy Metals NA NA NA NA Lead 18.2 1 NA 10.82 1 NA I MTBE 1234 NA 82 0.0019 Comments: Soil Before: Concentrations for TPH (Gas) is from sample GP-15 @ 15 feet on 10/2/1998, TPH (Diesel)from SP-2-A,B ( 2-points in stockpile) on 7/21/1998, benzene and toluene are from TC-2 @14 feet on 7/17/1998, lead from SP1 (ABCD) (4-points in stockpile) on 12/31/2008, xylene and ethylbenzene from MW-8 @ 15 feet on 8/14/2003, 1,2-DCA from MW-8 @ 20 feet on 08/14/2003 and MTBE from GP-14 @10 feet on 10/02/1998. Soil After: concentrations were not collected. Groundwater Before: Concentrations for TPH (Gas), toluene, lead, xylene, ethylbenzene, and MTBE are from TW-W on 7/17/1998, TPH (Diesel)from TP-B on 7/27/1998, benzene from TC-W on 7/17/1998, 1,2-DCA from MW-1 on 9/18/2003. Groundwater After: concentrations for TPH (Gas), benzene, toluene are from MW-3 on 5/03/2013, xylene and ethylbenzene from MW-3 on 05/03/2013, MTBE from MW-4 on 5/03/2013. NA-not analyzed IV. Closure Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan?Yes Does corrective action protect public health for current land use? Yes Site management requirements: None Should corrective action be reviewed if land use changes?Yes Monitoring/Remediation Wells Decommissioned? Yes Number Decommissioned: 13 Number retained: 0 List enforcement actions taken: NOR on 01/29/2009 and 7/31/1998 List enforcement actions rescinded: None V. Local Agency Representative Data Name: Linda Turkatte, REHS Title: Director Signature: Date: 02/20/2015 VI. Central Valley Regional Water Quality Control Board RB Notification Date Submit ed to RB: 07/09/2014 Response Date: 07/29/2014 RB Staff: Cori Condon Response: Concurrence Title: Eng. Geologist VII. Additional Comments, Data, etc. This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official siie file.