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Ms.Nancy Bishop - 3 - 13 September 2001 This monitoring schedule that GeoSyntec proposes to evaluate the progress of the pilot test consists of measuring the following constituents: dissolved oxygen, iron, manganese, alkalinity, nitrogen compounds, chloride, sulfur compounds, HRC breakdown products (lactic, pyruvic, acetic, propionic, and butyric acids), volatile organic compounds, and gases (propene, ethene, ethane, and methane). This pilot test progress monitoring supplements the quarterly monitoring specified in the MRP. Geosyntec will report the pilot test monitoring results in the regularly scheduled quarterly monitoring reports and will evaluate the pilot test at the end of two years. The proposed injection grid is directly upgradient of MW-2 that contains 1,2-DCP, nitrate and ammonium. HRC is designed to gradually induce reducing conditions in the local area of injection that will stimulate microbial communities to reduce nitrate to nitrogen gas, and, if reducing conditions are strong enough, reduce 1,2-DCP to chloride and methane. This work plan and accompanying monitoring schedule will provide data necessary to evaluate if the technology can be successful, to what extent, and within what time frame. The work plan is approved as proposed. According to our 10 September 2001 telephone conversation, Ms. Carolyn Kneiblher of GeoSyntec proposed that field work would commence prior to 31 October 2001, and the initial HRC report will be included within the Annual Monitoring Report which is due 30 January 2002. If you have any uestions, you may contact me at (916) 255-3080. AM RRELL Private Sites Cleanup Unit cc: Ms. Carol Oz, San Joaquin County Environmental Health Department, Stockton Mr. Fred Strauss, Western Farm Service,Vernalis Mr. Frank R. Fossati, Shell Oil Company, Lake Forest Ms. Carolyn Kneiblher, GeoSyntec Consultants, Walnut Creek