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Woodward-Clyde Consultants Mr. James L. Tjosvold California - Environmental Protection Agency July 28, 1995 Page 2 years of post closure quarterly groundwater monitoring. Woodward-Clyde completed the post closure groundwater monitoring for the Field Avenue site. No additional activities have been conducted by Woodward-Clyde at the Field Avenue site since the completion of the post closure groundwater monitoring program in 1990. Lika's former Navy Drive facility is located at 2041 Navy Drive in Stockton, California. The site is immediately bounded by Nelson Ready-Mix Company to the west, Laidlaw Transportation to the east, a railroad right-of-way to the north, and partially developed commercial land to the south (Figure 3). Lika used the former Navy Drive facility to manufacture printed circuit boards during the period 1969 to 1985. In 1986, Lika contracted Woodward-Clyde to conduct an evaluation to assess the extent of soil and groundwater contamination. Several localized areas of contamination requiring clean up were identified in the investigation. Lika contracted Woodward-Clyde to oversee the clean up operations of the areas identified in the investigation. After clean up activities were completed, DTSC required two years of post closure quarterly groundwater monitoring. Woodward-Clyde completed the post closure groundwater monitoring at Lika's former facility located on Navy Drive. A letter from DTSC to Lika dated March 24, 1993 terminated the monitoring requirements originally stipulated for the Navy Drive site. In that letter, DTSC specified that the only activity remaining is the proper decommissioning of existing wells. The decommissioning activities were described in a letter work plan dated May 24, 1993, prepared by Woodward-Clyde addressed to DISC. In a letter dated November 22, 1993 from DTSC to Lika, approval of the work plan was granted for all of the Field Avenue site monitoring wells and all of the Navy Drive monitoring wells except for MW-14, MW-14D, MW-16, MW-16D, and MW-30. These wells would be placed under the oversight of the Regional Water Quality Control Board (RWQCB). In a letter dated November 3, 1994 from Ms. Wendy L. Cohen (RWQCB) to Lika, approval was granted to decommission all monitoring wells at the 2041 Navy Drive site. On May 17, 1995 Woodward-Clyde met with Ms. Diane Hinson (SJCEHD) to discuss the decommissioning activities and acquired permit number 006052 to decommission the 17 monitoring wells at the two former Lika sites. In a letter dated May 22, 1995 to SJCEHD from Mr. and Mrs. Kent Carlson, permission was granted to decommission MW-5 located on Carlson Boatel and Sales property adjacent to the 1856 Field Avenue site. In a letter dated May 26, 1995 to SJCEHD from Mr. Russel C. Nelson, permission was granted to 90189N/LIKA.REP(07-28-95)SAC 4r* V,a aW