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Case Closure Summary Page 2.
<br /> aking Underground Fuel Storage Tank Fam
<br /> III Release and Site Characterization Information (continued)
<br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup
<br /> [TPH
<br /> ontaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm)
<br /> Before After Before After Before After Before After
<br /> (Gas) 60 <1 3.1 <0.050 Ethylbenene 0.61 <0.005 0.025 <0.0005
<br /> TPH(Diesel) 110 <1 3.6 <0.050 Xylenes 7.3 <0.005 0.149 <0.0006
<br /> TPH (Motor Oil) 92 3.8 17 <1.0 MTBE 32 0.14 0.002 <0.001
<br /> Benzene 0.21 <0.005 0.017 <0.0005 1,2-DCA <0.005 <0.01 0.0038 . <0.0005
<br /> Toluene 0.63 <0.005 0.037 <0.0005
<br /> Comments: Soil Before result for: TPH(Gas) is from P3-10 collected August 31, 1999; TPH (Diesel) is from P1-5 collected
<br /> August 31, 1999; TPH (Motor Oil) is from Piping 4 collected February 24, 1999; benzene is from P12-15 collected October
<br /> 10, 2003; toluene, ethyl benzene, and xylenes are from TK2-N collected February 24, 1999; MTBE is from P3-10 collected
<br /> August 31, 1999, and 1,2-DCA is from P7-45, 55, and 60 collected June 6, 2000. Soil After result for: TPH (Gas), TPH
<br /> (Diesel), toluene, ethyl benzene, xylenes, and 1,2-DCA are from P8 through P12 collected October 10, 2003; TPH (Motor
<br /> Oil) is from P9-5 collected October 9, 2003; Benzene is from P12-25, P12-40, and P12-50 collected October 10, 2003; and
<br /> MTBE is from P12-15 collected October 10, 2003. Water Before results for: TPH (Gas), benzene, toluene, ethyl benzene,
<br /> and xylenes are from MW-5R collected on November 12, 2008; TPH (Diesel) and TPH (Motor Oil)are from P9-65 to 68
<br /> collected October 9, 2003; MTBE is from MW-1 collected June 16, 2000; and 1,2-DCA is from MW-5R collected April 10,
<br /> 2007. Water After results for: TPH (Gas), benzene, toluene, ethyl benzene, xylenes, and 1,2-DCA are from MW-5R
<br /> Icollected December 5, 2008, and January 22, 2009; TPH (Diesel) and TPH (Motor Oil) are from MW-4 and MW-5 collected
<br /> on November 21, 2006; and MTBE is from MW-1 collected on November 12, 2008.
<br /> IV. Closure
<br /> F
<br /> completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes
<br /> 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: 6 Number retained: 0
<br /> List enforcement actions taken: NOR 06/03/99 and 04/25/07
<br /> List enforcement actions rescinded: None
<br /> V. Local Agency Representative Data
<br /> Name: Donna Heran, REHS Title: Director
<br /> Signature: Date:
<br /> l- ll- 1�
<br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification
<br /> Date Submitted to RB: September 24, 2009 Response Date: October 8, 2009
<br /> RB Staff: James L.L. Barton Response: Concurrence
<br /> Title:Associate Engineering Geolo ist
<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
<br /> site file.
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