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Leak!kzr�Underground Fuel Storage Tank(Jogram <br /> former 76-Unocal, now ConocoPhillips Station #5886 <br /> Ill Release and Site Characterization Information (continued) <br /> February 2, 2011 <br /> Maximum Documented Contaminant Concentrations Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water n <br /> Before After Before After Before After Before TPH (Gas) 3400 <2.5 0.260 0.054 Ethyl-benzene 23. <0:012 0.41 TPH (Diesel) 5500. 2.5 1.0 NA Xylene 210 0.027 1.5Benzene 0.01 <0.005 0.057 <0.0005 MTBENA* 12 122. <br /> Toluene 0.18 <0.005 0.470 <0.0005 <br /> [2000). <br /> ents "Before"soil data from piping and dispenser samples July 1995. After"soil data from <br /> or "HA-3" (hand augers 1997). Groundwater"before"data from "GP-17" (1995) or MW-1, MW-2, <br /> -3 (pre 2002 ozone injection). MW-3 highest MtBE groundwater concentration, 122 mg/I (May <br /> Groundwater "after from MW-1, 2, & 3 (BTEX from April 2009, TPHg from July2010). Highest, <br /> urrent'MtBE'in'MW=1",0.039 pm 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? No. Number Decommissioned: 0 <br /> Number retained: 33 casings in 27 boreholes. <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 List enforcement actions rescinded: none 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: Adrienne Ellsaesser, REHS Title: LOP Program Coordinator <br /> Name: _ <br /> Signature: %�L11� fy � Date: Z�// <br /> VI. Central Valley Regional Water Quality Control Board (RB):Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: James L.L. Barton Response: <br /> Title: Engineering 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 /> Case Closure Summary Page 2 of 2 <br />