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SECOR <br /> International Incorporated <br /> l`_' 42 <br /> September 20, 2001 <br /> Project 077 43527 230 <br /> Mr Mike Infurna <br /> San Joaquin County Environmental Health Division <br /> 304 East Weber Street, 3rd Floor <br /> Stockton, CA 95202 <br /> Re Site Assessment Report and Work Plan for Further Assessment <br /> Chevron Station #9-9840 <br /> 4344 Waterloo Road <br /> Stockton, California <br /> Dear Mr Infurna <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Products Company <br /> (Chevron), presents this report for soil and groundwater assessment at the above-referenced <br /> Chevron site (Figure 1) Eight cone penetration testing (CPT) borings were advanced along the <br /> northern and eastern property boundaries to assess soil stratigraphy Adjacent to each CPT <br /> boring, a second direct-push borehole was advanced to collect soil and groundwater samples <br /> Based on the findings of the CPT investigation described in this report, SECOR also proposes a <br /> work plan for further assessment at the site <br /> SITE BACKGROUND AND PREVIOUS INVESTIGATIONS <br /> The site is an operating Chevron station located at 4344 Waterloo Road, near Highway 99 in <br /> Stockton, California Current station features include three underground storage tanks (USTs) in <br /> a common excavation, a station building, six product dispensers under a common canopy, and a <br /> car wash The site is located in a light commercial area of Stockton in a relatively flat lying area <br /> A summary of previous investigations pertinent to the assessment is located in Attachment A <br /> ASSESSMENT ACTIVITIES AND FINDINGS <br /> On July 31 through August 3, 2001, SECOR supervised Gregg Drilling & Testing, Inc (Gregg) <br /> of Martinez, California, as they advanced direct-push bonngs at 8 locations (CPT-1 through <br /> CPT-8) along the northern and eastern property boundaries to assess soil stratigraphy and collect <br /> discrete soil and groundwater samples (Figure 2) Each CPT boring was monitored continuously <br /> for soil behavior and pore pressure to its total depth CPT-1 was advanced to approximately 60 <br /> feet below ground surface (bgs), however, the CPT log for that boring showed no easily <br /> . identifiable water-bearing zones Asa result CPT-2 was advanced to approximately 100 feet bgs <br /> to collect deeper stratigraphic data Subsequent CPT bonngs were advanced to a total depth of <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916 861 0400 916 861 0430 Fut' www secor com <br />