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Work Plan Addendum - July 2002 THREE B'S TRUCK PLAZA 14749 North Thornton Road, Lodi, California 1.0. INTRODUCTION Advanced GeoEnvironmental,Inc (AGE)has prepared this work plan for installation of six multi- level ground water monitoring wells at 14749 North Thornton Road,Lodi, California(the site) The location of the site is illustrated on Figure I A plan of the site is illustrated on Figure 2 The proposed scope of work is in accordance with a verbal directive from the San Joaquin County Environmental Health Department(SJCEHD,telephone conversation with Mr Michael Infurna on 03 April 2002) Prior to implementing a Corrective Action Plan(CAP)for the site,additional ground water monitoring wells are required to determine the lateral and vertical extent of petroleum hydrocarbon-impacted ground water Upon completion of the additional assessment, a report of findings and/or a Problem Assessment Report (PAR) will be prepared This work plan is prepared in accordance with California Regional Water Quality Control Board - CentraI Valley Region (RWQCB) guidelines for the investigation of underground storage tanks (UST) sites • 2.0. BACKGROUND The site is located at 14749 North Thornton Road, approximately 500 feet south of the intersection of Kettleman Lane and Thornton Road, Lodi, San Joaquin County, California (Figure 1) The site is presently utilized as a truck-stop, fueling facility and mini-mart Three 12,000-gallon and one 8,000-gallon above ground storage tanks (ASTs) are presently located on the southwest section of the property 21 REGIONAL GEOLOGIC SETTING According to a Geologic Map of California, published in 1966 by the California Department of Conservation Division of Mines and Geology, the site area is within the Great Valley Geomorphic Province(GVGP)of California, a large, elongate,northwest trending structural trough The GVGP is subdivided into two mayor divisions designated the Sacramento and San Joaquin Valleys,which have been filled to the present elevation with thick sequences of sediment ranging in age from Jurassic to present day, creating a nearly flat lying alluvial plain extending from the Tehachapi Mountains in the south to the Klamath Mountains in the north The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada, respectively Based on a General Soil Map from the San Joaquin County Soil Survey, published by the United States Department of Agriculture Soil Conservation Service in 1992, the site area is described as Advanced Gen E nviron mental,Inc