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Harding Lawson Associates <br /> June 14, 1991 <br /> 20548, 001. 03 JUN 17 1991 <br /> San Joaquin County ENVIRON HEALTH <br /> Public Health Services l'ERNI /S RVICES <br /> Environmental Health Services <br /> P. O. Box 2009 <br /> Stockton, California 95201 <br /> Attention: Ms. Margaret Lagorio <br /> Ladies and Gentlemen: <br /> Work Plan <br /> Soil and Groundwater Investigation <br /> Cozad Trailers <br /> Stockton, California <br /> INTRODUCTION <br /> On behalf of the Cozad Trailer Company, Harding Lawson <br /> Associates (HLA) presents this work plan to conduct a soil and <br /> groundwater investigation at the Cozad Trailers facility in <br /> Stockton, California. The purpose of this investigation is to <br /> determine whether groundwater has been impacted by the release <br /> of petroleum hydrocarbons that occurred before 1989 from the <br /> former 1, 000-gallon gasoline tank located at 4907 East Waterloo <br /> Road in Stockton, California. This work plan has been prepared <br /> in accordance to the Tri-Regional Board Staff Recommendations <br /> for Preliminary Evaluation and Investigation of Underground Fuel <br /> Tank Sites dated August 10, 1990 and the San Joaquin County <br /> Public Health Services, Environmental Health Division <br /> (SJC/PHS/EHD) Guidelines for Work Plan and report submittal. <br /> The site is in a flat-lying area in the eastern part of Stockton <br /> (Plate 1) . The Cozad Trailer facility consists of an office <br /> building, with rows of workshop space for fabrication of <br /> lowboys. The facility once had three underground storage tanks <br /> (USTs) in the central portion of the site, a 1, 000-gallon <br /> gasoline tank and 5, 000- and 10, 000-gallon diesel tanks, all of <br /> which were removed in 1989. We understand that no other USTs <br /> are located on site and that only small quantities of other <br /> petroleum products are used on site. The latter are stored in <br /> 55-gallon drums. Any waste generated from the use of these <br /> chemicals is kept on site for a very short time before it is <br /> hauled away. <br /> Engineering and 1355 Willow Way, Suite 109,Concord, CA 94520 4151687-9660 <br /> Environmental Services A Suhsidiaq of Harding Associates•Offices Nationwide <br />