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'I <br /> 1 <br /> SECOR <br /> International Incorporated <br /> ENVIRONMENTAL HEALTH DIVISION <br /> 304 E. Weber Ave. Third Floor <br /> April 19, 2001 P. O. Box 388ved, S ckton CA 95201 -0388 <br /> Appro <br /> Project 077.43469 . 130 Denied <br /> Conditio AL "+� akdl <br /> Mr. Harlin Knoll - -�.ta#� CP �— <br /> San Joaquin County Environmental Health Divisio, Or by <br /> 304 East Webber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Re: Revised Work Plan for Site Assessment <br /> Former Chevron Service Station 9-8632 <br /> 575 Grant Line Road <br /> Tracy, CA <br /> Dear Mr. Knoll: <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Products Company <br /> (Chevron), presents this revised work plan for site assessment at the above-referenced <br /> site (Figure 1). This work plan replaces the November 21 , 2000 work plan for site <br /> assessment prepared by SECOR for Chevron. <br /> OBJECTIVE <br /> The purpose of the site assessment is to further delineate the lateral extent of petroleum <br /> hydrocarbons in soil and groundwater beneath the site. Fifteen cone penetration testing <br /> (CPT) borings (14 onsite and 1 offsite) will be advanced to assess soil stratigraphy. <br /> Adjacent to each CPT boring, a second direct-push borehole will be advanced to collect <br /> soil and groundwater samples as described in the Proposed Scope of Work. <br /> SITE BACKGROUND <br /> The site is a former service station located at 575 Grant Line Road in Tracy, California. <br /> The site is currently a used car lot (Imperial Leasing Ltd.) located in a mixed light <br /> commercial and residential area (Figure 2). <br /> There are currently four groundwater monitoring wells located at the site. During the <br /> first quarter 2001 , total petroleum hydrocarbons quantified as diesel (TPHd) were <br /> detected in samples from all four wells at concentrations ranging from 88. 1 ppb (MW-1) <br /> to 293 ppb (MW-3). Total petroleum hydrocarbons quantified as gasoline (TPHg) were <br /> detected in three of four samples at concentrations ranging from 572 ppb (MW-2) to <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916. 861. 0400 916. 861 . 0430 Pax avww. secor. com <br />