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0 F <br /> CAMBRIA <br /> February 26, 2001 <br /> Ms Margaret Lagorio <br /> Environmental Health Division <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton, California 95202 t) <br /> Re Site Investigation Report ► <br /> Shell-branded Service Station "`- <br /> 1071 North Main Street <br /> Manteca, California r <br /> Incident#98995643 ' <br /> Cambria Project#243-0323 <br /> Dear Ms Lagono <br /> Cambria Environmental Technology, Inc (Cambria) is submitting this Site Investigation Report <br /> on behalf of Equiva Services LLC The investigation was conducted in accordance with our <br /> July 19, 2000 Investigation Work Plan approved by the San Joaquin Public Health Services <br /> (SJPHS) in their letter dated July 28, 2000 The work was requested in an SJPHS letter dated <br /> May 19, 2000 This investigation consisted of advancing six cone penetrometer test (CPT) <br /> borings at locations on- and off-site Presented below are a site summary, investigation <br /> procedures and results, and Cambria's conclusions and recommendations <br /> SITE SUMMARY <br /> Site Location The site is an active Shell-branded service station located at the southwest corner <br /> of the intersection at North Main Street and Louise Avenue in Manteca, California (Figure 1) <br /> The site is surrounded by mixed residential and commercial property <br /> 1996 Soil Sampling During Site Upgrade Subsurface investigations performed during upgrade <br /> Oakland CA activities at the site in 1996 identified elevated hydrocarbons in soil near the western dispenser <br /> San Ramon CA and on the east side of the former underground storage tanks (USTs) The highest total petroleum <br /> Sonoma CA hydrocarbon as gasoline (TPHg) concentration detected in soil was 1,300 nulligrams per <br /> Portland OR <br /> kilogram (mg/kg) from 13 feet below grade (fbg) from beneath the east end of former <br /> Cambria underground storage tanks This area was subsequently over-excavated to 25 fbg <br /> Environmental <br /> Technology,Inc <br />*144 65th Street <br /> r <br /> Suite B <br /> Oakland CA 94608 <br /> Tel(510)420-0700 <br /> Fax(510)420-9170 <br />