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695 Rlvar'Akv,2y T 408232_J_800 Earl Tech San Jose-CA 95134 F108 '_322801 A Tyro Inlemational Ltd.Cif Opnq `NVA,'Pal fh I^Cn.COnl January 19, 2006 Project 88854 Ms. Violeta Mislang California Environmental Protection Agency Department of Toxic Substances Control Tiered Permitting Corrective Action Branch Permitting Corrective Action Division 5796 Corporate Avenue Cypress, CA 90630 Subject: Proposed Additional Sampling for Bis(2-ethylhexyl)phthalate 1848 and 1856 Field Avenue, Stockton, California Dear Ms. Mislang: On behalf of Tyco Electronics, Earth Tech, Inc. (Earth Tech) is submitting the following information to conduct additional characterization for bis(2-ethylhexyl)phthalate at the former Tyco Electronics Facility located at 1848/1856 Field Avenue in Stockton, California (site). In November 2005, Earth Tech conducted additional characterization of naphthalene and bis(2- ethylhexyl)phthalate in groundwater and naphthalene and other volatile organic compounds (VOCs) in soil gas at the site per the request of the California Environmental Protection Agency (Cal/EPA), Department of Toxic Substances Control (DTSC) as part of the Preliminary Endangerment Assessment (PEA) process. Naphthalene was not detected in any of the samples; however, bis(2-ethylhexyl)phthalate was detected in two of the groundwater samples. On December 22, 2005, Earth Tech discussed these findings with Mr. Robert Senga of DTSC and indicated that Tyco would like to perform additional characterization for bis(2-ethylhexyl)phthalate. Mr. Senga verbally approved the request to conduct additional characterization. In order to expedite the process, Mr. Senga said that a work plan need not be prepared and requested that a map be submitted showing the proposed sampling. For reference, the results of the November 2005 investigation are provided in the attached Addendum 1 Additional Soil Gas and Groundwater(text and tables only), which will be formally submitted as part of the revised PEA report. The results of the November investigation are also shown on Figure 1. Please note that Addendum 1 also refers to the same Figure 1; we did not want to duplicate it in this submittal. As requested by Mr. Senga, the proposed additional groundwater and soil sampling are shown on the attached Figure 2 and Figure 3 for 1856 Field Avenue and 1848 Field Avenue, respectively. The additional characterization focuses on the area where bis(2-ethylhexyl)phthalate was detected at concentrations of 85 micrograms per liter (pg/L) and 390 pg/L in the groundwater beneath 1856 Field Avenue during the November 2005 investigation. Additionally, we are also proposing to collect groundwater samples beneath the 1848 Field Avenue site in the vicinity where bis(2-ethylhexyl)phthalate was detected at 7.9 pg/L in one of the two duplicate groundwater samples collected from soil boring SB-5 in January 2005. The proposed sampling at 1848 Field Avenue is shown on Figure 3. The proposed additional sampling activities will be conducted in accordance with the procedures presented in the PEA Work Plan (dated November 2005) for the site and the subsequent addendum (approved by DTSC on October 25, 2005) to the PEA Work Plan that was prepared for the November 2005 investigation conducted at the site. A brief summary of the proposed