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Escalon Cellars TL F06601.01 February 9, 2000 Page 5 monitor well with 10 feet being above water and 20 feet below to provide for increases and declines of the water table. Water level measurements in the onsite production well indicate a depth to water of 55 to 60 feet.Based on this,the anticipated total depth of the monitor wells will be approximately 80 feet and the wells will be perforated from 50 to 80 feet. The wells will be constructed of four- inch diameter Schedule 40 PVC casing with flush threaded joints. The bore hole with be 11 inches in diameter. Perforations will be 0.02-inch and the wells will be gravel packed with Lonestar No. 3 sand or equivalent. The gravel pack will be tremied through the augers and placed from the bottom of the well to approximately five feet above the top of the perforations. A minimum three foot thick bentonite seal will be placed on top of the gravel pack and the remaining annular space will be filled with a sand-cement grout. The cement seals will be allowed to cure for a minimum of 48 hours before development and sampling of the wells. The wells will be completed above ground and an 8-inch diameter surface casing with a locking lid will be installed to secure the wells. Drill cuttings are anticipated to be non-hazardous and will be placed in the disposal fields. Monitor well drilling, well installation and development will be done according to Twining's SOP's which are included in Appendix A. 4.22 Laboratory Analysis - All samples will be analyzed at the Twining Laboratories, Inc., a State of California Certified Laboratory. The samples will be analyzed for halogenated volatile organics using EPA Method 601. 4.23 Surveying-The new monitor wells will be surveyed by a State of California licensed surveyor. The location of each monitor well will be surveyed and plotted on a base map of appropriate scale. Measuring point elevations will be measured to the nearest 0.01 foot. 4.24 Site Safety Plan - A site specific site Health and Safety Plan (HSP) will be prepared which will address safety concerns related to drilling and ground-water sampling at the Escalon Cellars site. A copy of the HSP will be kept on site at all times during the field investigation and all personnel involved in the field operations will be informed of potential safety concerns and the location and content of the safety plan. A copy of the HSP is included in Appendix B 4.3 Task 3 Technical Report After completion of the field investigation, Twining will prepare a report summarizing the results of the investigation. The report will include well construction, logs of the soils encountered during monitor well drilling, a ground- water elevation map and a summary of the analytical results from monitor well sampling. The report will include conclusions on whether ground water has been impacted and an estimate of the impact,if any. Recommendations for further work, if necessary,will also be included. 5.0 SCHEDULE