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Ding Underground Fuel Storage Tank Ph.ram <br /> Ill 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) 4.4 <1.0 TC E 0.0061 <0.005 <br /> TPH (Diesel) <100 <1.0 PC E 0.021 <0.005 <br /> TPH (Oil) 7,400 <10. 1, -DiChbenzene 0.078 <0.005 <br /> Benzene <0.005 <0.005 1, -DCA <.005 <0.005 <br /> Toluene .021 <0.005 Cr3 14. <.1 <br /> Ethyl-benzene .710 <0.005 Cr3 10. 18. <br /> Xylene 4.5 <0.005 Pt, 14. <.5WET <br /> MTBE(8260) No Test <0.005 Ni 6. 11. <br /> Zn 170. 143. <br /> Comments: * No groundwater investigation conducted r required. No groundwater samples collected or <br /> encountered to total depth of 41.5' below ground surface (--hi torical high groundwater, 1986). <br /> WET=Waste Extraction Test performed. <br /> No soil remediation performed or directed. "Soil before" resu is from UST removal soil samples "TKA @ 7.5' bgs"; <br /> 11TK-2 @ 3' bgs" and Stockpile. "Soil after" results from LOP nvestigation soil borings "SB-1 @ 11.5' bgs and 16.5' <br /> b s"or"SB-2 @ 20.5' b s". <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 se? YES <br /> Site management requirements: none <br /> Should corrective action be reviewed if land use changes? Not necessarV. <br /> Have the MonitoringfVapor wells been decommissioned? n1a Number Decommissioned: _n/a. Number retained: 0 <br /> List enforcement actions taken: NORR. 2-22-99 <br /> List enforcement actions rescinded: none <br /> V. Local Agency Representative Data <br /> Name: Donna Horan I Margaret LagorioTitle: Director of Envn Health !LOP Supervisor <br /> Signature: ate: - 10 1 <br /> VI. Central Valley Regional Water Quality Control Board (RB) P otification <br /> Date Submitted to RB: F esponse Date: <br /> RB Staff: Marty Hartzell F esponse: <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> None <br /> This document and the related CASE CLOSURE LETTER, shal be retained by the lead agency as part of the official <br /> site file. <br />