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i - <br /> _ A <br /> Corporation <br /> .;. 1433 North Market Boulevard <br /> cramento, CA 95834-1943 <br /> 916.928.3300 <br /> ?.,t'•If t- Fax.9.16.928.3341 <br /> the £, x rt <br /> (t1*0up. <br /> t �6.:., 3 ( PI i 12: 7A Mernber of The 17'Croup <br /> May 25, 2000 <br /> Project 880-040.1A <br /> Ms. Carol Oz <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue <br /> Stockton, California 95202 <br /> Re: Additional Assessment Work Plan <br /> Parkinson's Hammer I5 Arco <br /> 3250 West Hammer Lane <br /> Stockton,California <br /> Dear Ms. Oz: <br /> On behalf of Mr. Jim Parkinson of Parkinson's Hammer I5 Arco, IT Corporation (IT)presents <br /> a work plan describing proposed additional site assessment work at the site referenced above <br /> (Figure 1). The purpose of this work is to define lateral and vertical extent of petroleum <br /> impacted soil and groundwater as requested in the letter prepared by San Joaquin County <br /> Environmental Health Department (SJCPHS/EHD) 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 <br /> is a privately owned Arco-branded service station that has retailed gasoline fuel for <br /> approximately 14 years. The site currently contains three-12,000-gallon capacity gasoline <br /> underground storage tanks (USTs) and associated product lines and dispensers. Diesel fuel <br /> has never been dispensed at the site. <br /> Product line upgrade began on January 7, 2000. Mr. Michael Kith with SJCPHS/EHD <br /> observed soil compliance sampling per the Tri Regional Board Staff Recommendations for <br /> Preliminary Evaluation and Investigation of Underground Tank Sites. After the removal of <br /> dispenser plumbing, soil obviously impacted by petroleum hydrocarbons was discovered <br /> below the western dispenser islands. Soil samples were collected from beneath the dispensers <br /> and along the product lines at a depth of approximately 3.5 feet below ground surface (bgs). <br /> Remedial activities conducted on January 26, 2000 included removal of obviously impacted <br /> soil in the area below dispenser and product lines. Excavation areas were selected based upon <br /> the results of January 7, 2000 sampling. Excavation was restricted laterally by concrete <br />