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INT_ERIM REMEDIATION : WORK PLAN Boyett Manteca 419 S. Main Street Manteca, California June 25,2003 1.0. INTRODUCTION This work plan was prepared by Condor Earth Technologies, Inc. (Condor) to describe proposed interim groundwater remediation activities, and monitor well destruction and installation activities, at the Boyett �. Petroleum (Boyett) facility located at 419 S. Main Street (site) in Manteca, California (Figures 1 and 2, Appendix A). On May 15, 2003, a Condor representative met with,Mr. Nuel C. Henderson, Jr. and Mr. Jeffrey Wong of the San Joaquin County Environmental Health Department (SJCEHD) to review recommendations proposed in the First Quarter Groundwater Monitoring Report March 2003, dated April 3, 2003, and SJCEHD concerns regarding the site. In a letter dated May 29, 2003, Mr. Henderson, Jr. and Mr. Wong.requested the submittal of a work plan for interim remediation of groundwater contamination at the site. Mr. Henderson and Mr. Wong also agreed with.Condor's recommendation to destroy damaged monitor wells MW-4 and MW-5, and to install a replacement monitor well for MW-4. . The purpose of the interim remediation activities..is to. remove petroleum hydrocarbons from the groundwater and to capture the plume of petroleum hydrocarbon contaminants- in the groundwater to prevent .further off-site migration of the contaminants. This work plan includes project-background information; a description of the field, laboratory, and reporting procedures proposed to conduct the work; and a project schedule. All work conducted by Condor will be under. the supervision of a California . Registered Geologist. 2.0 SITE BACKGROUND On November 20 and 21, 1996, soil sampling was conducted at the site by WHF, Inc., (WHF) under the direction of Mr. Robert McClellon of the SJCEHD. One soil sample was collected frombeneath each of the site's three existing fuel dispensers. at a depth of'approximately,two feet below the dispenser piping and four discrete soil samples were collected to characterize approximately.44 cubic yards of material stockpiled at the site. The soil samples were analyzed for total petroleum hydrocarbonsquantified as gasoline (TPH-G), for benzene, ethyl benzene, toluene; total xylenes (BTEX),;and for methyl tert-butyl ether(MTBE). On October 5, 1998, WHF completed.two soil borings to a maximum depth of 18 feet below ground surface (bgs) proximal to the fuel dispenser.island Three soil samples were collected from each boring at ,. depth intervals of 4-6.feet, 9-11 feet, and 16 feet. One groundwater sample was collected from each boring from a depth of 18 feet for laboratory analyses. �a CONDOR