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I. 2 BACKGROUND Mr. Lester Schmiedt has owned the subject property since the early 1940's and developed it in 1946. Mr. Schmiedt operated a soil amendments (fertilizer) service on the site until the 1970's, when the business was sold to Mr. Alan Schmiedt. In 1982, the business (not the property) was sold to Mr. Dave Mathews and Mr. William Clark and Tri-Ag began operations on the site. Tri- Ag provided chemical and fertilizer application services up to 2001. Tri-Ag has since been closed. The site occupies approximately 11/2 acres, although the entire Schmiedt property occupies 5 acres. Documents referencing the property were included by Ms. Malma Nicholson to Ms. Devra Lewis of the State of California Regional Water Quality Control Board (RWQCB). The documents were as follows: March 1988 Preliminary Assessment (PA) submitted by the Department of Toxic Substances Control, 19 July 1988 Review of the Preliminary Assessment of Schmiedt Soil Service, Incorporated (PA Review) submitted by ICF Technology Inc. 23 September 1993 Site Inspection (Site Inspection Report) submitted by Bechtel Environmental, Inc., Final Environmental Impact Report (ElR) submitted by WPM Planning Team, Inc. Information gathered from the reports was included in a letter (dated April 26, 2002) from the RWQCB requesting a Revised Workplan be prepared for the investigation of soil and groundwater at the site to Mr. Lester Schmiedt and Mr. Alan Schmiedt of Schmiedt Soil Service, Inc. and Mr. W. J. Clark and Mr. David Mathews of Tri-Ag Services, Inc. The above reports states in part that the site was owned by Mr. Lester Schmiedt since the early 1940's. In the late 1940's, the business was sold to Mr. Alan Schmiedt, and in 1982 sold to Mr. W. J. Clark and Mr. David Mathews of Tri-Ag Services, Inc. Due to the recommendations included in each of the reports to conduct site inspections and soil contamination investigations, the RWQCB requested that a soil and groundwater investigation be conducted at this time for possible pollution. A Revised Workplan was prepared based upon the information relayed in the letter from the RWQCB dated April 26, 2002. A workplan was prepared for a limited soil and groundwater investigation by Kleinfelder titled "Limited Soil and Groundwater Investigation", and dated July 29, 2002. The workplan was conditionally approved by the RWQCB. The workplan addressed the following points: Review of available records of pesticide types, application practices, storage areas, and disposal procedures (part of Phase I Environmental Site Assessment); Review of records of unauthorized pesticide releases or spills (part of Phase I Environmental Site Assessment); Examination of at least four generations of historical aerial photographs (part of Phase I Environmental Site Assessment); 27125.E0I / STO4R181 Page 4 of 23 © 2004 Kleinfelder, Inc. February 13, 2004 KLEINFELDER 2825 East Myrtle Street, Stockton, CA 95205-4794 (209) 948-1345 (209) 948-0621 fax