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i <br /> ATC Associates Inc. <br /> 1117 Lone Palm Avenue, Suite B <br /> Modesto,California 95351 <br /> 209-579-2221 <br /> CV- ATC Fax:209-579-2225 <br /> A S S O C I A T:E,S. 1 tV C. <br /> July 9; 2007 <br /> Mr.Nuel Henderson <br /> San Joaquin County <br /> Environmental.Health Department <br /> 304 E. Weber Street, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Workplan for Additional Subsurface Investigation, Soil. Vapor Study, . and <br /> Modeling at Fayette Manufacturing Corporation Site, 7675 West Eleventh Street, <br /> Tracy, California <br /> Dear Mr. Henderson: <br /> ATC Associates Inc. (ATC) has prepared this Work Plan on behalf of Dr. A. R. Glover in <br /> response to the August 29, 2006, directive letter issued by the San Joaquin County <br /> Environmental Health Department (EHD). The letter included a regulatory review and response <br /> to ATC's March 6, 2006,Risk Assessment for the Fayette Manufacturing Site report. <br /> The Work Plan has been prepared for the above referenced site and includes the following <br /> activity: <br /> • Completion of six GeoprobeO direct-push soil borings in the vicinity.of MW-2 and MW- <br /> . 2 and former UST#1 and UST#2; <br /> • Completion of two.soil vapor borings and collection of soil gas samples and subsequent <br /> vapor intrusion modeling in areas described above; <br /> • Comparison of proposed and historic soil, groundwater, and soil vapor analytical data to <br /> the San Francisco Bay.Regional Water Quality Control Boards (RWQCB) Environmental <br /> Screening Levels (ESL) for shallow soils (less than three meters in depth); EPA Region <br /> IX Preliminary Remediation Goals (PBGs) October 2004, Version 9, and California <br /> Human Health Screening Levels; and <br /> • Summary of 2006 and 2007 monitoring well network monitoring program. <br /> The activities proposed at the project site are described in the following paragraphs. <br /> Page 1 <br /> w:\17861\WP for Additional Subsurface Investigation <br /> Soil Vapor Study,and Modeling <br />