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w <br /> �"� ,IIfE� sEC R 3 �{g�{e��Suite 100 <br /> ■ INTERNATIONAL Rancho Cordova,CA 95670 <br /> S E C O R INCORPORATED 916-861-0400 TEL <br /> 916-861-0430 FAX <br /> 2005 APR - 1 PH 10: 13 <br /> March 31, 2005 SAN JOt101Pfid COUNTY <br /> ENVH'1'0"NL7NTAL <br /> HEALTHUEPAP7MENT <br /> Ms. Lori Duncan <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> RE: Work Plan for Additional Site Assessment and Interim Remediation <br /> Addendum <br /> 7-Eleven Store# 32262 <br /> 2360 West Grant Line Road <br /> Tracy, California <br /> SECOR Project No.: 77EL.32262.05.0105 <br /> Dear Ms. Duncan: <br /> This work plan addendum was prepared by SECOR International Incorporated (SECOR) on <br /> behalf of 7-Eleven Inc. to describe design specifications for an extended groundwater <br /> pumping test at the 7-Eleven Store Number 32262 located at 2360 West Grant Line Road <br /> in Tracy, California (Figures 1 and 2). This work plan addendum was prepared in response <br /> to the San Joaquin County Environmental Health Department's (SJCEHD) letter stamp <br /> dated February 14, 2005 (Attachment A). <br /> SCOPE OF WORK <br /> SECOR will conduct an extended groundwater pumping test using EX-1 to confi -the <br /> radius of influence (ROI) and drawdown calculations determined during the initial 48=hour <br /> test conducted on August 11-12, 2004. , c <br /> HEALTH AND SAFETY <br /> SECOR will use our existing site-specific Health and Safety Plan for the proposed scope of <br /> work as required by the Occupational Health and Safety Administration (OSHA) Standard <br /> "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910.120). <br /> The document will be reviewed and signed by all SECOR personnel and subcontractors <br /> prior to performing work at the site. <br /> GROUNDWATER PUMPING TEST DESIGN <br /> Groundwater Extraction Step-Draw Down and Constant Discharge Feasibility Test <br /> In preparation for the groundwater extraction test, a 6,900-gallon holding tank will be set at <br /> the site adjacent to the extraction well. A 3-inch diameter electric submersible groundwater <br /> pump, controller, and generator will be used to extract groundwater from EX-1. The pump <br /> will be set one foot off the bottom of the well and depth to the pump intake from top of <br /> casing will be recorded. A valve and flow meter connected in-line with the discharge hose <br /> will be used to control and measure flow rate. Pressure transducers will be placed into <br /> 1:17-Eleven\7-11 Stores\32262\Workplans\32262 Addendum to Offsite well install and interim remediation workplan.doc <br />