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Addendum 1 Additional Soil Gas and Groundwater Sampling Final Preliminary Endangerment Assessment Tyco Electronics Corporation, Printed Circuit Group 1856 Field Avenue, Stockton, California Docket SRPD 03/04 SCC-4313 Project No. 88854 January 2006 This addendum report presents the results of soil vapor and groundwater sampling performed at 1856 Field Avenue, Stockton, California in accordance with the California Environmental Protection Agency Department of Toxic Substances Control (DTSC)- approved Addendum to Final Preliminary Endangerment Assessment (PEA) Work Plan for Tyco Electronics Facility, 1848 and 1856 Field Avenue, Stockton, California (Work Plan) dated September 30, 2005. As stated in the Work Plan, this report will be included as an addendum to the PEA Report. Investigation activities included the following: • Collection of soil gas samples from four locations (SV-1 through SV-4) in the drill room in the area where naphthalene was detected in a single groundwater sample from prior exploratory soil boring location SB17. The soil gas samples were analyzed for volatile organic compounds (VOCs), including naphthalene, by Environmental Protection Agency (EPA) Method TO-15. • Collection of four grab groundwater samples from the same four locations noted above. Because both naphthalene and bis(2-ethylhexyl)phthalate were detected in the groundwater sample at prior location SB17, the grab groundwater samples were analyzed for naphthalene and bis(2-ethylhexyl)phthalate by EPA Method 8270C. Pre-Field Activities The following activities were completed prior to conducting the soil gas and additional groundwater sampling described herein: • An addendum to the original DTSC-approved site-specific Health and Safety Plan (HASP) was prepared and was kept onsite during field activities along with the original HASP. • Earth Tech notified Underground Service Alert (USA) of the proposed drilling activities, and employed the services of a private utility locator to attempt to determine existence and location of potential underground utilities or obstructions in the vicinity of proposed locations. • Site access for the field activities was obtained November 9, 2005 from the Property Owner. Page 1 of 4 January 2006