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6920 Koll Center Parkway �1 Clayton <br /> Suite 216 <br /> Pleasanton,U 94566 <br /> 925.426.2600 GROUP SERVICES <br /> Fax 925.426.0106 <br /> August 6, 2004 <br /> FILE COPY <br /> Ms. Devra Lewis <br /> Regional Water Quality Control Board <br /> 11020 Sun Center Drive#200 <br /> Rancho Cordova California 95670 <br /> _ Clayton Project No. 70-03759.00 <br /> Subject: Workplan for Preliminary Delineation Investigation <br /> Former Shell Central Valley Crude Oil Pipelines <br /> Mountain House Community-Neighborhoods B, C and D <br /> Parcels: 209450-04, 11, 12, 13,209-060-08 <br /> San Joaquin County, Tracy, California <br /> Dear Ms. Lewis: <br /> This letter has been prepared by Clayton Group Services(Clayton) on behalf of Shell Oil <br /> Products US (Shell)regarding the above-referenced former pipelines. Presented herein is <br /> a workplan for a preliminary delineation investigation of potential petroleum <br /> hydrocarbons in soil and groundwater along a portion of the former subsurface crude oil <br /> Central Valley Pipeline route located northwest of Tracy, California(Figure 1). <br /> Specifically,the area designated for preliminary delineation is an approximately one-mile <br /> long section of the former pipeline alignment located west of Mountain House Parkway. <br /> The pipeline trends northwest/southeast and extends across several parcels west of <br /> Mountain House Parkway. The parcels are scheduled to be developed for residential use <br /> as part of the Mountain House Development. The parcels that are covered by this <br /> workplan are Parcel 209-450-04(part of Neighborhood C),Parcels 20450-11,209-450- <br /> 12, 209-450-13 (Neighborhood D), and Parcel 209-060-08 (Neighborhood B). <br /> Neighborhoods C and D are located north of Grant Line Road, and Neighborhood B is <br /> located south of Grant Line Road(Figure 2). These parcels are currently open farmland <br /> or in use for dairy operations. The parcels are located southeast of Parcel 209-050-08, <br /> which is currently under development, also known as Neighborhood E. Delineation of <br /> the former pipeline alignment is planned prior to the proposed residential development of <br /> those parcels. <br /> www.claytongrp.com <br /> Environmental Services • Occupational Health and Safety • Laboratory Services <br />