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WGIR, Southwest,t, lintc. A ground water sample will be collected from each well by lowering a disposable bailer approximately 2 feet into the water column. The bailer will be recovered and the water decanted into appropriate laboratory-supplied containers. The containers will be labeled, then placed immediately into a chilled cooler and maintained at approximately 4 degrees centigrade for delivery to a CDHS-certified laboratory for analyses. Strict chain-of-custody protocol will be followed throughout field and laboratory procedures. The samples will be analyzed for NH3-N by EPA Method 350.2 and pH using a calibrated field instrument capable of 0.01 precision. In a similar manner, existing Port of Stockton groundwater wells MW 3-4 and MW 3-6, located east and southeast of the tank farm, will be sampled and analyzed for NH3-N by EPA Method 350.2 and pH using a calibrated field instrument capable of 0.01 precision. HEALTH AND SAFETY PLAN A site specific Health and Safety Plan detailing known or potential hazards and emergency response procedures will be prepared prior to field operations. All on-site personnel will review the plan and conduct a "tailgate" safety meeting prior to initiation of field activities. The plan will be maintained on-site throughout the duration of field activities. The plan will be modified if warranted due to on-site conditions. DRILL SITE CLEARANCE Prior to the initiation of field operations, the drilling locations will be marked in white and Underground Service Alert (USA) will be contacted to identify any potential subsurface obstructions and/or conflicts. In order to further insure that no underground utilities or obstructions exist at the proposed well locations, the initial 5 feet of drilling will be hand-dug within each borehole. Adjustments to the surface locations may be required based on the results of the USA survey and hand-digging. DISPOSITION OF DRILL CUTTINGS AND WASTE WATER The drill cuttings generated during the drilling operation and the waste water generated by steam- cleaning the augers, well development, and purging will be stored on site in 55-gallon DOT- approved steel drums pending characterization. Each drum will be labeled with the site name and address, generation date, and type and source of the material it contains. Within 30 days of the generation date, the drummed soil and water will be transported to an appropriate facility for disposal. 725.PRI.00 4 August 28, 2003