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Cass Closure Summary Page 2 COPY <br /> Leaking Underground Fuel Storage Tank Program <br /> i <br /> III 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) S <br /> j Before After Before After ,' IBefore After Before After J <br /> TPH(Gas) 800 170 <.05 <.05 Xylene .480 7.1 <..001 <.0005 <br /> 005 <.0005 <br /> TPH(Diesel) 6100 <1 .08 <.05 Ethylbenzene .058 .78 <br /> Benzene <.005 <.12 .001 00005 MTBE „NT <12 .087 <.0005 <br /> Toluene <.005 .21 .001 <0005 TAME INT NT .005 <.0005 <br /> ik <br /> Comments: Soil TPHg and TPHd before samples were collected at 25' bsg during overexcavation work 12195. All other soil <br /> before samples were collected during tank removal, below the pump area. Soil lafter results were from soil boring HPI at 25' <br /> bsg on 2115196. Water before sample results for TPHd were from QM on $119199. Water before results for aEl other <br /> contaminants were from QM on 612199. Water after results are from QMion 8119199, TPHd water after sample from QM on <br /> 12121199. `I <br /> IV. Closure i <br /> .b <br /> i Does completed corrective action protect existing beneficial uses per the'Regional Board Basin Plan?YES <br /> 4 li <br /> Does completed corrective action protect potential beneficial uses per the <br /> Regional Board Basin Plan? YES <br /> Does corrective action protect public health for current land use? YES <br /> a , <br /> Site management requirements: NONE `f <br /> Should corrective action be reviewed if land use changes?YES <br /> MonitoringNapor wells decommissioned: 0 Number Decommissioned:', 0 Number retained: 3 <br /> � s <br /> J List enforcement actions taken: NOR <br /> I List enforcement actions rescinded: NONE I <br /> V. Local Agency Representative Data } <br /> .l <br /> Name: MARGARET LAGORIO, REHS Title: SUPERVISOR, SITE MITIGATION UNIT <br /> sf <br /> Signature:— � Date: I� $ 3 d- <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> 1{II Date Submitted to RB: Response Date: l <br /> I f� <br /> RB Staff: MARTY HARTZELL Response: <br /> Title: ASSOCIATE ENGINEERING GEOLOGIST I <br /> VII. Additional Comments, Data, etc. <br /> Soil and water contaminant concentrations are low. Nearest well is is located 1900 feet SW of the site. Groundwater level <br /> and gradient evidenced historical stability. 1 <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the official <br /> site file. <br /> � I� 1 <br />