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i <br /> SECOR <br /> International Incorporated <br /> 7 2000 <br /> AENT HEALT1 <br /> 'I. ;iT/SERVICF'' <br /> November 21,2000 <br /> Project 077.41991.500 ENVIRONMENTAL HEALTH DIVISION <br /> 304 E.Weber Ave.Third Floor <br /> Mr. Harlin Knoll A, R O. Box 388, S kton CA 95201-0388 <br /> Approved <br /> San Joaquin County Environmental Health Division Denied ❑ <br /> 304 East Webber Avenue, Third Floor Conditions oj_�e All- <br /> Stockton, CA 95201 <br /> Date�� us <br /> o n by <br /> Re: Work Plan for Site Assessment <br /> Chevron Service Station 9-2396 <br /> 25650 Highway 99 North <br /> Acampo, CA <br /> Dear Mr. Knoll: <br /> This letter,prepared by SECOR International Incorporated(SECOR) on behalf of <br /> Chevron Products Company,presents a work plan for site assessment at the above <br /> referenced site(Figures 1 and 2). The site assessment will consist of the drilling of <br /> three exploratory borings to collect soil and groundwater samples, and the sampling of <br /> the on-site domestic well. The purpose of this assessment is to evaluate possible <br /> hydrocarbon impact to soil and groundwater at the site. <br /> This work plan includes a brief discussion of site background and previous <br /> investigations,proposed scope of work, and schedule. Field and laboratory procedures <br /> are presented as Attachment A. <br /> SITE BACKGROUND AND PREVIOUS INVESTIGATIONS <br /> The site is an active service station located at 25650 Highway 99 North in Acampo, <br /> California. <br /> On August 25, 1993, one waste oil underground storage tank(UST) and one heating oil <br /> UST were removed. One soil sample was taken from beneath each of the USTs. The <br /> Heating oil UST soil sample,D-1-9',reported non-detectable levels for all analyzed <br /> constituents. The waste oil UST soil sample, WO-1-9',reported non-detectable levels <br /> of all analyzed constituents except for chromium at 29 parts per million(ppm),lead at 7 <br /> ppm, zinc at 44 ppm, and nickel at 21 ppm. <br /> On December 15, 1993, one 10,000 gallon,two 6,000 gallon, and one 3,000 gallon <br /> single walled steel USTs were removed. The USTs appeared to be in good condition, <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916.861.0400 916.861.0430 Fax www.secor.com <br />