SITE INFORMATION AND CORRESPONDENCE

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Case Closure Summary Page Waking Underground Fuel Storage Tank Pram III Release and Site Characterization Information (continued) Maximum Documented Contaminant Concentrations -- Before and After Cleanup Contaminant Soil (ppm) Water (ppm) Contaminant 11 Soil FA"ft pm) Water (ppm) Before After Before After Before er Before After TPH (Gas) 160 90 Ti- <.05 Ethylbenene 0.010 <0.005 0.053 <0.0005 TPH (Diesel) 4,200 3,900 2,900 <.05 Xylene 0.041 <0.005 0.068 <0.0006 Benzene <0.005 <0.005 0.038 <0.0005 MTBE <0.05 <0.005 0.0082 <0.001 Toluene <0.005 <0.005 0.012 <0.0005 Comments: Soil Before diesel results are from T-1 collected beneath the tank @ 10 feet bsg on 08112197; gasoline results are from MW5-10 collected on 01131102; benzene, toluene, ethyl benzene and total xylene results are from (T1)S2-10 (TR-1) collected on an adjacent property on 10125199; and MTBE results are from P1-15 collected on 07113100. Soil After diesel results are from 132-10 collected on 08108/07; and gasoline, benzene, toluene, ethyl benzene, total xylene, and MTBE results are from 81-10 collected on 08/08/07 . Water Before diesel, gasoline, and MTBE results are from P4-1-120 collected Ion 07113100; and benzene, toluene, ethylbenzene, and total xylene results are from Water-1 collected from the bucket of the backhoe from digging beneath the tank on 08/12197. Water After results are from the monitoring wells on 2/6/07. IV. Closure Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes Does corrective action protect public health for current land use? Yes Site management requirements: None Should corrective action be reviewed if land use changes?Yes MonitoringNapor wells decommissioned: No Number Decommissioned: 0 Number retained: 5 monitoring wells and 1 extraction well List enforcement actions taken: NOR 02/23/00 List enforcement actions rescinded: None V. Local Agency Representative Data Name: Margaret Lagorio, REHS Title: Program Coordinator Signature: L=f Date: g VI. Central Valley Regional Water Quality Control Board (RB) Notification Date Submitted to RB: Response Date: RB Staff: James L.L. Barton Response. Title: Associate Engineering Geologist VII. Additional Comments, Data, etc. This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the official site file.