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1 v <br /> A S S O C I A T E S I N C <br /> Summary Report of <br /> Subsurface Investig', n�.� <br /> 1 Farmer Property <br /> 610 North Hunter Street <br /> ' Stockton, California <br /> ATC Project No 62596 0001 <br /> 1 <br /> 1.0 INTRODUCTION <br /> 1 <br /> This report summarizes procedures and practices utilized by ATC Associates to evaluate impacted <br /> 1 soil and groundwater associated with the former underground storage tanks (USTs) and the <br /> results of First Quarter 1998 monitoring activities at 610 North Hunter Street, Stockton, <br /> 1 California The investigation consisted of drilling six soil borings, installing four groundwater <br /> monitoring wells, and collecting soil and groundwater samples for analysis <br /> 1_1 Site Location <br /> The site is located at 610 North Hunter Street, Stockton, California (Figure 1) The area of <br /> 1 investigation, the former tanks location, is located approximately 10 feet south of the on-site <br /> building, 5 feet west of the property line, and 30 feet north of Oak Street <br /> 1 The site is located on the northeast corner of Oak Street and North Hunter Street The location is <br /> primarily a commercial and residential area The site was formerly occupied by a rental car <br /> 1 agency, but is currently vacant <br /> ' 1_2 Site Background and Previous Work <br /> On October 6, 1987, Al Williamson, General Contractor, removed two 1,000-gallon leaded <br /> gasoline tanks and one 550-gallon waste oil tank from the locations shown on Figure 2 Soil <br /> samples collected after the tank removals contained elevated concentrations of petroleum <br /> 1 hydrocarbons and volatile organic compounds (VOCs) <br /> On January 21, 1988, Falcon Energy, attempted to remove all VOC and petroleum hydrocarbon <br /> contannnated soil by overexcavating the former tank locations The former tank locations were <br /> excavated to a depth of approximately 22 feet below ground surface (bgs) The excavation was <br /> limited to the north by the on-site building The confirmation samples collected from the base of <br /> w 162596VV0rts\PhnP6i doe 1 <br /> i <br />