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. Z5� <br /> FUGRO WEST, INC. <br /> June 7, 1995 1050 Melody Lane,Suite 160 <br /> Roseville,California 95678 <br /> Project No. 9347-0020 UN 0 g 1995 Tel: (916)782-2110 <br /> FAX: (916)786-7830 <br /> Ms. Mary eays E <br /> ALTH <br /> San Joaquin County Public Health Services PEW MS Qces <br /> Environmental Health Division <br /> Post Office Box 388 <br /> Stockton, California 95201-0388 <br /> Subject: Workplan Addendum <br /> Shell Service Station (WIC No. 204-7525-0104) <br /> 6131 Pacific Avenue, Stockton, California <br /> Dear Ms. Meays: <br /> INTRODUCTORY SUMMARY <br /> Fugro West, Inc., (Fugro) on behalf of Shell Oil Products Company (Shell), is providing <br /> San Joaquin County Public Health Services, Environmental Health Division (SJCPHS/EHD) this <br /> addendum to the February 26, 1993, "Workplan For Limited Additional Subsurface <br /> Investigation". This addendum has been prepared in response to the May 16, 1995, telephone <br /> conversation between you and Mr. Dan Kirk of Shell. <br /> Revisions to the original workplan are based on historical ground water information, the <br /> refusal of the property owner to the south to grant access to Shell, the 75-day vapor extraction <br /> test performed in 1991 and 1992, and the likely natural attenuation of petroleum hydrocarbons <br /> in the subsurface. <br /> The original workplan proposed the installation of three off-site ground water monitoring <br /> wells. However, the fieldwork described herein is proposed to investigate the following: <br /> 1. The effect, on soils, of a 75-day vapor extraction test conducted in 1991 and 1992; <br /> 2. The extent of natural attenuation of petroleum hydrocarbons previously detected in soils <br /> beneath the former underground storage tanks; <br /> 3. The extent of petroleum hydrocarbons potentially in soil and ground water northwest <br /> (upgradient) of the former tanks; and <br /> 4. The extent of petroleum hydrocarbons potentially in soil and ground water southeast <br /> (downgradient) of the former tank locations. <br /> 93470020.BWP A member of the Fugro group of companies with offices throughout the world _ <br />