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Earth Tech Ms. Violeta Mislang <br /> A Tyco Intemational❑d.Company September 30,2005 <br /> Page 4 of 4 <br /> Upon completion of the groundwater sampling, the borings will be grouted using a cement- <br /> betonite mixture in accordance with San Joaquin County permit requirements. <br /> Reporting <br /> Earth Tech will prepare an addendum/appendix to the PEA Report summarizing the soil vapor <br /> and groundwater sampling activities and results. Risk assessment sections of the PEA Report <br /> will also be revised to incorporate this additional data. The addendum/appendix will be submitted <br /> to DTSC in conjunction with the revised PEA Report for review. We are proposing to report <br /> these additional activities in an addendum or as an appendix to the report in order to minimize <br /> changes in the report body, such as tables, figures and related text. <br /> Please note that since (1) bis(2-ethylhexyl)phthalate is a very common laboratory contaminant, <br /> and (2) this additional sampling is proposed to verify that its previous detection in samples was <br /> due to laboratory contamination issues, we propose to exclude the compound from the COPC <br /> list if (1) the proposed additional sampling does not detect it at the site, or (2) the additional <br /> sampling shows that it is truly a laboratory contaminant based on laboratory quality control data <br /> and data validation procedures accepted by USEPA. <br /> Schedule <br /> An approximate schedule for implementation of the additional soil gas and groundwater <br /> investigation presented in this Work Plan addendum and completion of the evaluation of the data <br /> and associated reporting is presented on Figure 2. Please note the start date and schedule will <br /> be dependent on review and approval of this work plan addendum by DTSC, coordination of site <br /> access with the property owner, and coordination of field activities with subcontractors. <br /> If you have any questions regarding this work plan addendum, please do not hesitate to call the <br /> undersigned at (408) 232-2800. <br /> Very truly yours, <br /> Earth Tech Inc.Dan Ruslen <br /> Project Engineer <br /> Ze4lv <br /> un, P.E. <br /> Program Director <br /> CC: Mr. Robert Senga (DTSC) <br /> Mr. Glen Foster(Tyco Electronics) <br /> Mr. Chuck Katz(Earth Tech) <br /> Mr. Doug Fisher(Earth Tech) <br />