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• Page 2 June 6, 2005 contamination levels of less than several ppm of diesel. In the event any field indication of hydrocarbons in water is obvious additional holes, stepped further away from the assumed source(south east of MW No. 6)will be probed. Samples of in-situ water will be collected at each probed point, using proprietary samplers. Particular emphasis on cleanliness of all collection and probing devices will be emphasized due to the extremely low non-detection goal of less than 50 ppb. Water will be transported to and analyzed at Sequoia Analytical, a California DOS certified laboratory for extractable hydrocarbons in the diesel range (C10 - C28) using the DHS LUFT method with standard quality control and a reporting limit of 50 ug/l. Penetration holes will be filled with Portland cement grout to the satisfaction of your agency upon completion of water sampling. Safety, hygiene and quality control during probe and sample handling is the same as in the October 2003 submitted workplan but will be discussed again at the site prior to start up of work. D.K. Barber P. E. and Associates will forward drilling permit applications for submittal to your agency along with required fees and necessary signatures by the drilling contractor. I understand that EHD may require several weeks to issue permits. I have tentatively scheduled drilling, for 29 June 2005. Site personnel will review the site's health and safety plan and USA underground will be contacted to screen the boring area two working days prior to boring commencement. If I may clarify our proposed plan please to not hesitate to contact me at(530) 823- 2156. I L- Daniel K. Barber, RCE 21,210 Principal attach:2 pg Summary of Findings, 1 Site Map with findings and proposed locations cc: w/o attach. Hans Ho, PhD,Western Oil&Spreading