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t <br /> IT Corporation <br /> f 1433 North Market Boulevard <br /> Sacrimento, CA 95834-1943 <br /> . Tel 916 928 3300 <br /> Fax 916 928 334.1 <br /> theV12roup� <br /> A Aff tuber of The 11 &romp <br /> ur <br /> December 52000 <br /> Project 880-040 IA <br /> c� <br /> Ms Carol Oz <br /> San Joaquin County Public Health Services �- <br /> Environmental Health Division <br /> 304 East Weber Avenue <br /> sv <br /> Stockton, California 95202 ' -_ <br /> Re Additional Assessment Report <br /> Parkinson's Hammer I-5 Arco <br /> 3250 West Hammer Lane <br /> Stockton, California <br /> Dear Ms Oz <br /> On behalf of Mr Jim Parkinson of Parkinson's Hammer I-5 Arco, IT Corporation (IT) presents <br /> the results of additional assessment work performed at the site referenced above (Figures 1 <br /> and 2) The purpose of flus work is to define lateral and vertical extent of petroleum impacted <br /> soil and groundwater as requested by San Joaquin County Public Health Services, Environmental <br /> Health Department (SJCPHS/EHD) in their letter dated April 24, 2000 <br /> SITE BACKGROUND <br /> The site is located on West Hammer Lane east of Interstate 5 in Stockton, California The site is <br /> a privately owned Arco-branded service station that has retailed gasoline fuel for approximately <br /> 14 years The site currently contains three 12,000-gallon capacity gasoline underground storage <br /> tanks (USTs) and associated product lines and dispensers Diesel fuel has never been dispensed <br /> at the site <br /> Product line upgrade began on January 7, 2000 Mr Michael Kith with SJCPHS/EHD observed <br /> soil compliance sampling After the removal of dispenser plumbing, soil obviously impacted by <br /> petroleum hydrocarbons was discovered below the western dispenser islands Soil samples were <br /> collected from beneath the dispensers and along the product lines at a depth of approximately <br /> 3 5 feet below ground surface (bgs) <br />