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i r INTERNATIONAL TECHNOLOGY CORPORATION Ms. Wendy Wyels Page 3 4. IT will survey all wells relative to the established benchmark located on West Washington Street near the Port of Stockton offices. 5. Soil samples collected from drilling the new wells will only be analyzed if necessary to help define the extent of impacted soil or to identify possible sources of chemicals known to exist in the groundwater. The proposed soil sampling plan is summarized in Table 5. Specifically, the soil sample from MW-6 and MW-7 will be analyzed for nitrate and the soil sample from MW-7 will also be analyzed for ammonia. Remedial Options Feasibility Study (Section 2.2) The feasibility study (FS) will follow the general guidelines required for CERCLA. The FS will occur in three phases: the development of alternatives, the screening of alternatives and the detailed analysis of alternatives. Section 2.2 has been expanded to provide further detail of the FS process. RRg orts (Section 2.3) As requested, quarterly monitoring reports will be submitted within eight weeks of sample collection. Ouarterly Monitoring (Section 2.3.2) The quarterly groundwater sampling analytical program will follow the same program as outlined in Table 5. Specifically, all wells will be sampled for pesticides, nitrate and ammonia. Four wells (MW-1,2,3 and 6) will be sampled for herbicides to monitor plume dimensions and concentrations known to exist only in MW-3. Six wells (MW-1,2,4,5,7 and 8) will be sampled for petroleum hydrocarbons to monitor plume dimensions and concentrations known to exist only in MW-1. Thank you for your assistance on this project. If you have questions or require any additional information, please call me at (916)361-7673. Sincerely, IT CORPORATION Joseph Ramage, R.G. Project Manager Enclosure - Workplan cc: Mr. Mike Nakagawa, Esq. - Nakagawa & Rico (2 Copies) Mr. Mike Infurna - San Jaoquin County PHS/EHD R Corporation a a wholly owned ntiwdlary of thwinavond Technology Corpom0on