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i LeakiVg' Underground Fuel Storage Tankrogram <br /> former 76-Unocal, now ConocoPhillips Station #5886 <br /> III Release and Site Characterization Information (continued) February 3, 2012 <br /> Maximum Documented Contaminant Concentrations - Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water I(ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 3400. <2.5 0.260 0.054 Ethyl-benzene 23. <0.012 0.41 <0.0005 <br /> TPH (Diesel) 5500. 2.5 1.0 NA Xylene 210 0.027 1.5 <0.001 <br /> Benzene 0.01 <0.005 0.057 <0.0005 MTBE NA* 12 122. .039 <br /> Toluene 0.18 <0.005 0.470 <0.0005 <br /> Comments "Before"soil data from piping and dispenser samples July 1995. "After"soil data from "HA- <br /> 1" <br /> HA1" or "HA-3" (hand augers 1997). Groundwater "before"data from "GP-17" (1995) or MW-1, MW-2, or <br /> MW-3 (pre 2002 ozone injection). MW-3 highest MtBE groundwater concentration, 122 mg/I (May 2000). <br /> Groundwater "after"from MW-1, 2, & 3 (BTEX from April 2009, TPHg from July 2010). Highest, most <br /> current MtBE in MW-1, 0.039 ppm (July 2010) NA*= Not analyzed <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per Regional Board Basin Plan? Yes <br /> Does completed corrective action protect potential beneficial uses per 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 /> Have the Monitoring/sparge wells been decommissioned? Yes. Number Decommissioned: 33 <br /> Number retained: 0 <br /> List enforcement actions taken: NOR (Aug 1995, Dec 2001, & Dec 2007). SJ County DA case. <br /> List enforcement actions rescinded: none <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director, Environmental Health Department <br /> Signature: Date. _ 3 / - Z ©/ 2- <br /> V1. <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: February 2, 2011 Response Date: February 14, 2011 <br /> RB Staff: James L.L. Barton Response: concurrence to NFA. <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> VRP_"om pletes well destructions Nov 8, 2011 and submits IDW manifests Jan 27, 2012. <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br /> Case Closure Summary Page 2 of 2 <br />