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Site Background Information FERNANDWS PLACE 1201 South Center Street, Stockton, California INTRODUCTION The site is located at the intersection of Jackson Street, French Camp Road, and South Center Street in Stockton, California (Figure 2), and is the location of a former gasoline service station. The site is currently occupied by several buildings, including a small-engine repair facility and a single-story, multi-family residence. GROUND WATER DEPTH AND GRADIENT Based on quarterly ground water monitoring events conducted by AGE, depth to ground water at the property is approximately 20 feet to 30 feet below surface grade (bsg). The prevailing ground water flow direction is generally northeast, although flow directions may vary locally and seasonally. Depth to first encountered ground water at the property during the last quarter was measured to be approximately 27 feet bsg. PREVIOUS SITE ASSESSMENT According to reported documents two 500 gallon and one 8,500 gallon gasoline underground storage tanks (UST 1 , UST 2, and UST 3 , respectively) were removed from the site on 26 October 1994. Ten soil samples were analyzed from the excavation soil stockpile, the UST excavations, and the product piping; each sample contained detectable concentrations of petroleum hydrocarbon contamination. The highest concentrations were located near the west end of UST 3 (Figure 2). On 28 April 1998, soil boring PBI (or BP) was advanced near UST 1 and UST 2 to a depth of 30 feet below surface grade (bsg) for the collection of soil samples. Analyzed samples contained concentrations of total petroleum quantified as gasoline (TPH-g) as high as 14, 100 milligrams per kilogram (mg/kg). Additionally, samples were collected from the soil boring for ground water monitoring well MW- 1, installed on 28 April 1998 . Analyzed samples from MW-1 contained high concentrations of TPH-g and benzene, toluene, ethylbeneze, and total xylenes (BTEX) to a depth of approximately 50 feet bsg. Four additional ground water monitoring wells were installed between 08 and 12 March 1999. Analyzed soil samples collected from monitoring well soil borings contained detectable concentrations of TPH-g to depths as great as 105 feet bsg, and BTEX compounds to depths as great as 120 feet bsg. Between 14 and 21 August 2001 , the site assessment scope advanced six Cone Penetrometer Testing (CPT) borings on- and off-site to depths between 122 and 175 feet bsg. Based on data collected from Advanced GeoEnvironmental, Inc.