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. I <br /> SE www secor com <br /> INTERNATIONAL 3017 Kilgore Road,Suite 100 <br /> S E C O ll�p� y jrr�NNC�] PORATE CD I 7 Rancho Cordova CA 95670 <br /> rh1 HEAL111 11 916-861-0400 Ti <br /> 916-661-0430 fnx <br /> 03 OCT -6 QM 1: 19 <br /> October 1, 2003 <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 Soil and Groundwater Assessment Work Plan Addendum <br /> 7-Eleven Store#32262 <br /> 2360 West Grant Line Road <br /> Tracy, California <br /> SECOR Project No 77EL 32262 03 0105 <br /> Dear Ms Duncan <br /> This work plan addendum was prepared by SECOR International Incorporated (SECOR) on behalf of <br /> Mr Ken Hilliard of 7-Eleven Inc for the installation of four groundwater monitoring wells at the 7- <br /> Eleven Store Number 32262 located at 2360 West Grant Line Road in Tracy, California (Figures 1 <br /> and 2) This work plan addendum was prepared in response to the San Joaquin County <br /> Environmental Health Department's (SJCEHD) letter stamp dated September 22, 2003, requesting <br /> vertical assessment of dissolved methyl-cert-butyl ether (MtBE) at the site mentioned above <br /> • (Attachment A) <br /> SCOPE OF WORK <br /> In addition to the five groundwater monitoring wells proposed for installation in SECOR's Soil and <br /> Groundwater Assessment Work Plan, dated August 12, 2003, SECOR proposes to Install one <br /> groundwater monitoring well to 50 feet below ground surface (bgs) to define the vertical limit of MtBE <br /> adsorbed to soil and dissolved in groundwater Data obtained from the drilling and installation of the <br /> monitoring well will be used to evaluate the presence and nature of petroleum hydrocarbons <br /> adsorbed to soil and dissolved in groundwater at the site The following scope of work is proposed <br /> HEALTH AND SAFETY <br /> SECOR will modify our existing site-specific Health and Safety Plan for the proposed scope of work <br /> as required by the Occupational Health and Safety Administration (OSHA) Standard "Hazardous <br /> Waste Operations and Emergency Response" guidelines (29 CFR 1910 120) The document will be <br /> reviewed and signed by all SECOR personnel and subcontractors prior to performing work at the <br /> site <br /> PERMITTING AND UTILITY CLEARANCE <br /> SECOR will obtain well Installation permits from the SJCEHD The tank pit well originally installed <br /> within the existing underground storage tank (UST) pit will also be permitted with the proposed wells <br /> Prior to conducting subsurface work at the site, Underground Service Alert (USA)will be contacted to <br /> delineate subsurface piping near the site with surface markings In addition, a private utility locator <br /> service will be contracted to clear the area surrounding the proposed monitoring well locations <br /> 117-Elevenl7-11 Stores1322621Workplans132262 Well Instl WkPlan Addendum2 doc <br />