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Ms Vicky McCartney Project No 880-040 IA <br /> 1, 6 December 8, 2003 <br /> Page 2 <br /> SITE DESCRIPTION <br /> The site is located on West Hammer Lane east of Interstate 5 in Stockton, California <br /> (Figure 1) The site is a privately owned Arco-branded service station that has operated <br /> for approximately 14 years The site currently contains three 12,000-gallon capacity <br /> gasoline underground storage tanks (USTs) and associated product lines and dispensers <br /> Diesel fuel has never been dispensed at the site The locations of pertinent site feature is <br /> shown on Figure 2 <br /> PREVIOUS ENVIRONMENTAL WORK <br /> Product line upgrade was conducted in January 2000 After the removal of dispenser <br /> plumbing, petroleum hydrocarbon impacted soil was discovered beneath the western <br /> dispenser islands Soil samples were collected from beneath the dispensers and along <br /> the product lines at a depth of approximately 3 5 feet below ground surface (bgs) <br /> Remedial activities conducted in January 2000 included removal of approximately <br /> 262 tons of impacted soil in the area of the dispenser and product lines Excavation was <br /> restricted laterally by concrete canopy footings and asphalt surfacing Maximum <br /> excavation depth was 10 feet bgs due to shallow groundwater depth Results of soil <br /> sampling and excavation were reported in IT Corporation's Product Lane Upgrade and <br /> Soil Excavation Report, dated March 15, 2000 <br /> Five Geoprobe® borings (GP-1 through GP-5) were advanced on August 15 and 16, <br /> 1 2000 Each boring was advanced to groundwater, at which time a discrete water sample <br /> was collected Following groundwater sample collection, each boring was advanced to a <br /> maximum depth of 30 feet bgs <br /> Three groundwater monitoring wells (MW-1 through MW-3) were installed on <br /> September 6, 2000 The well locations were selected based upon results of the <br /> Geoprobe° investigation Quarterly groundwater monitoring has been conducted at the <br /> site since the First Quarter 2001 event <br />' N%acDPM031Pg18 M0040 1 A 3aa doc <br />