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Harlin Knoll San Joaquin County November 23,2004 Page 3 of 4 Stockpile Sampling and Disposal of Drill Cuttings Soil cuttings generated during drilling activities will be placed in 55 gallon drums onsite pending evaluation of disposal options. A minimum of four soil samples will be collected from the cuttings using the methods described in Enclosure A. The samples will be submitted to Kiff Analytical where they will be composited into one sample. The composite sample will be analyzed for BTEX and TPH in the gasoline range by EPA Method 8260, and total lead by EPA Method 6010. Based on the laboratory analytical results,the soil cuttings will be transported to an appropriate landfill for disposal. Well Development The wells will be developed a minimum of 72 hours after completion. The wells will be developed by surging the well with a surge block followed by purging with a disposable bailer or centrifugal pump. Surging and purging will be repeated until purge water is relatively sediment free. If the well is purged dry during development,the well will be allowed to recharge and will be purged dry again a minimum of three times. The water generated during development will be containerized on-site pending evaluation of disposal options. A licensed waste hauler will be contracted to dispose of the purge water. Well Sampling and Water Level Measurement Groundwater samples will be collected from the newly installed monitoring wells following completion of well development. Prior to purging and sampling,the depth to the water table will be measured to within 0.01-foot relative to a reference point on each monitoring well. The wells will be purged and sampled in accordance with the field methods and procedures described in Enclosure A. The groundwater samples will be submitted to Kiff Analytical for analysis of BTEX, TPH in the gasoline range, MTBE, DIPE, ETBE, TAME, TBA, methanol, ethanol, and 1,2-DCA using EPA Method 8260. Surveying of Wells Reference points on the new monitoring wells and adjacent ground surface will be surveyed by an appropriately-licensed land surveyor. To comply with State regulation AB2886,Delta will request the licensed surveyor to reference the locations of the newly installed wells to the California State Coordinate System using Global Positioning Satellite (GPS) surveying. The top of casing (TOC) elevations of the monitoring wells and ground surface elevations will be surveyed relative to MSL within 0.01-foot. Schedule Delta has scheduled a drilling subcontractor for the week of January 5, 2005. Delta requests expedited approval of this work plan by the SCEHD and will submit a drilling permit application and fee to facilitate the approval process. A report summarizing the results of the investigation will be submitted to the regulatory agencies 60 days following the completion of the proposed scope of work.