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A l L'i • 15 October 2000 AGE-NC Project No 96-0232 Page 4 of 11 The process pump, located behind the holding tank, will be controlled by electrode switches placed at various levels in the holding tank An emergency shut-off switch will be located immediately below the top of the holding tank An Intermediate pump-on switch will be placed approximately 8-inches below the emergency shut-off switch to activate the process pump Intermediate pump-off switches will be utilized near the bottom of the holding tank to turn the process pump off One 750-gallon poly tank equipped with a suspended-solids pre-filter will be used to temporarily store extracted water prior to processing The tank will be equipped with various level control switches to control the rate at which extracted water is introduced into the treatment vessels, to provide safety shutoff capabilities and to allow coarse sediment to settle out prior to treatment The process pump is located directly behind the holding tank The first stage of treatment media will contain two 2,500-pound GAC absorption vessels designed to adsorb TPH-g, TPH-d and BTEX compounds, the final stage of treatment media will contain two 2,500-pound SunSolve absorption vessels, a liquid-phase filtration media specifically designed to adsorb MTBE and TBA Sample ports are located between all vessels to allow detection of media break through and to obtain final discharge samples The system layout is depicted in Figure 3 • l 8 Ground Water Analysis Chlorinated volatile hydrocarbons (EPA Method 8260), aromatic volatile hydrocarbons (EPA Method 8020) and total petroleum hydrocarbons quantified as gasoline and diesel (EPA Method 8015M/5030) have been sampled at site in monthly/quarterly ground water monitoring events and grab ground water samples collected from soil borings and the results submitted to the RWQCB in quarterly reports, results were tabulated in Problem Assessment Report, dated 19 June 2000 A grab sample from EW-1, was collected on 06 October 2000 and submitted to a DHS-certified Iaboratory for analysis of lead, chlorinated pesticides and general minerals Copies of the laboratory reports are included In Appendix B 2.0. SITE HYDROGEOLOGY In accordance with Section B of Attachment A from General Order 5-00-119, AGE has evaluated the following mentioned site hydrogeology characteristics - 2 1 Depth To Ground Water Review of historical depth to ground water maps published by the San Joaquin County Flood Control • .Advanced GeoEnvironmental,Inc