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-� Case Closure Summary Page2. <br /> T c 3king Underground Fuel Storage Tank P�a m <br /> III Release and Site Characterization Information (continued) <br /> FMaximum Documented Contaminant Concentrations -Before and After Cleanup (tank removal) <br /> Contaminant Soil Soil Water Water Contaminant Soil Soil Water Water <br /> Before Alter Before After Before: After <br /> Before After <br /> (in ppm) (in ppm) (in•ppm) (in ppm). <br /> TPH(Gas) 2,200 5.2 13 .960 MTBE :: _048 <br /> 0.34 <br /> TPH (Diesel) 640 6.8 .900 EDB ;E ---- <br /> Benzene 960 0.031 .290 .240 Lead <br /> Toluene 2,000 0.014 .087 .130 <br /> Ethylbenzene 4,700 0.96 a.005 .090 <br /> Xylene ---- 1.1 .550. .140 Ee <br /> Ei <br /> "Soil Before" results are from soil samples taken at the tank removal in 1986 except TPH�d which is from P4 on <br /> 12112194. "Soil After" results are from MW3 at 15 feet on 7128197. "WaterBefore" results are from MW3 on 7129197 except <br /> TPH--d which is from MW4 on10131197. "Water After" results are from:MW-3 on 10/21/99 except TPH-d which is from <br /> MW4 on 4130198. <br /> The concentration of MTBE in groundwater listed above was detected using EPA_Method 8020, not 8260. The highest <br /> concentration of oxygenates in subsequent water samples from geoprobe igrab samples using 8260 were 0.058 pgll of <br /> MTBE. <br /> The investigation indicated minimal contamination in the soil and groundwater. Beneficial uses ofgroundwater are <br /> protected, now and in the future. E; <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 use?. Yes <br /> Site management requirements: none <br /> Should corrective action be reviewed if land use changes?Yes <br /> Monitoring wells decommissioned: yes Number Decommissioned: 6 Number retained: 0 <br /> List enforcement actions taken:. NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donn Heran Title: Director of Environmental Health Department <br /> Signature: vy� Date: �� `1U3 <br /> 6 <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: November 21, 2002 Response!Date: January 27; 2003 <br /> RB Staff: Marty Hartzell Response; Concurrence with No Further Action Required <br /> Title: Assoc Eng Geologist <br /> VIL Additional Comments, Data, etc. <br /> All remaining monitoring wells have been destroyed by over-drilling, or bypressure-groutwlien over-drilling was not <br /> practical due to overhead power-line obstruction. <br /> L This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the <br /> official site file. (08124193) Exhibit N Page 2 of 2 <br /> li. # <br />