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I� ! <br /> 5 !1 <br /> SECOR <br /> _ International Incorporated <br /> i Pi! Irl 27 <br /> October 29, 2001 <br /> Project 077 43545 170 <br /> Ms Dot Lofstrom <br /> San Joaquin County Public Health Services <br /> Environmental Quality Division <br /> 304 E Weber Avenue, Third Floor <br /> Stockton, California 95201-0388 <br /> Re Site Assessment Report and Work Plan for Further Assessment <br /> Chevron Service Station 9-1452 <br /> 334 East Main Street <br /> Ripon, California <br /> Dear Ms Lofstrom <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Products Company <br /> (Chevron), has prepared this letter to document the results of assessment activities at the <br /> above-referenced site Three Geoprobe soil borings were advanced along the southern <br /> property boundary The objective of the site assessment was to evaluate soil and <br /> groundwater conditions west (downgradient) of the present and former underground <br /> storage tank (UST) complexes to support a request for site closure The work was done <br /> in accordance with SECOR's work plan dated April 24, 2001, which was approved by <br /> San Joaquin County Public Health Serviced (SJCPHS) on May 3, 2001 Based on the <br /> results of samples collected from these borings, SECOR has proposed a work plan for <br /> 1 further assessment at the site and that groundwater beneath the site be monitored and <br /> sampled on a quarterly basis <br /> SITE BACKGROUND AND PREVIOUS INVESTIGATIONS <br /> The site is an active service station located at 334 East Main Street, adjacent to <br /> Highway 99, in Ripon, California (Figure 1) Current site facilities include three <br /> 12,000-gallon gasoline USTs, two dispenser islands under a common canopy, and a <br /> station building containing two hydraulic hoists (Figure 2) <br /> A summary of previous investigations is presented in Attachment A <br /> • <br /> 1 1Cbevron%914521REYORTrS12001 Geoprobe SA&well wp_Rev B doc <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916 867 0400 916 861 0430 Fax www secor com <br />