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aA, Claytoii Ms.Devra Lewis Page 2 RWQCB Clayton Project 70-03759.00 July 31, 2004 1.0 SITE BACKGROUND The area of investigation consists of an approximate 8,400-foot lineal section of the former Shell Oil Company Central Valley Pipeline route that runs northwest/southeast across Sections 8 and 16 in Township 2 South,Range 4 East(Figures 1 and 2). The pipeline route consisted of one 8.5-inch diameter and one 10-inch diameter pipelines in the area that carried crude oil from the central valley to the Bay area. The former pipelines ran through farmed properties and were reportedly removed from operation during the 1960's. r The section of the pipeline route proposed for investigation is located on five parcels identified as future Neighborhoods B, C and D of the Mountain House Development(San Joaquin County Assessors Parcel Numbers [APN]: 209-450-04, 11, 12, 13, 209-060-08) and will be developed into a residential development. 2.0 OBJECTIVES The purpose of this preliminary delineation investigation is to obtain information on the presence or absence of petroleum hydrocarbons in soil and/or groundwater along the pipeline alignment that are attributable to the pipelines.The following scope of work will be performed to achieve the investigation objectives: • Survey the former pipeline route. • Trench select locations to confirm the position of the pipeline alignment. • Advance soil borings at regular spaced intervals along the pipeline to evaluate soil conditions immediately below the former pipelines. • Advance soil borings at locations of observed impact along the alignment to investigate groundwater conditions below the pipelines. The scope of work is discussed is the following sections. 3.0 SCOPE OF WORK AND METHODS The scope of work involves identifying the locations of the former pipeline alignment, followed by the subsurface investigation. The following sections discuss the proposed scope of work for this investigation.