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• July 21, 1993 Working To Restore Nature Fire Engine Company No 2, Stockton, California Task 3 VaRor-Extraction Test o Transport a portable vapor-extraction system to the site o Operate the vapor-extraction system as required to obtain vapor samples and vacuum and flowrate information. o Submit vapor samples to a State-certified laboratory for analyses of TPHg and BTEX Task 4 Feasibility Study o Interpret the field and laboratory data and evaluate the feasibility of available remedial alternatives Our feasibility study will include options for soil and groundwater remediation We will discuss our interpretation of the data with the client and make recommendations The remedial alternatives selected will be presented in the RAP The work will be performed in accordance with the Tri-Regional Board Staff Recommendations for Preliminary Evaluation and Investigation of Underground Tank Sites (California Regional Water Quality Control Board, Central Valley Region, August 1990), Appendix A to that document (August 1991), and the Leaking Underground Fuel Tank Manual (California Leaking Underground Fuel Tank Task Force, 1989) The vapor- extraction test will be conducted in accordance with San Joaquin County Air Quality District guidelines PROJECT STAFF Mr Richard H Walls, a Registered Civil Engineer in the State of California (P E 43139), will be in charge of this project Mr David F Stavarek, Protect Geologist, will manage field and office operations RESNA employs a staff of geologists, engineers, and technicians who will help complete the project We recommend copies of this Work Plan Addendum be sent to Ms Linda Turkett of the San Joaquin County Public Health Services, Environmental Health Division P O Box 2009, Stockton, California 95201, and Ms Elizabeth Thayer of the California Regional Water Quality Control Board, Central Valley Region, 3443 Routier Road, Sacramento California 95827-3098 • 38009-4w 4