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16200 McKinley Av.,Lathrop, CA <br /> AEI Project#9479 <br /> August 3,2003 <br /> Page 2 <br /> property to the south is used to store heavy equipment, and new modular homes. To the east of <br /> the subject property is a single-family home on a large undeveloped plot. McKinley Avenue is <br /> located to the west. Beyond McKinley Avenue, is lumber yard, and a shipping container storage <br /> yard. <br /> According to a review of the United States Geological Survey (USGS) Lathrop Quadrangle <br /> Topographic Map, the subject property is situated approximately 20 feet above mean sea level. . <br /> The topography in the immediate vicinity of the subject property slopes gently to the west. The <br /> nearest surface water is the San Joaquin River, located over two miles to the southwest. Based <br /> on topography and groundwater monitoring data reviewed for the adjacent Sharpe Army Depot <br /> site, groundwater flow is expected to tend toward the west or northwest. <br /> Background <br /> A Phase I Environmental Site Assessment (ESA) was performed for the property by AEI in <br /> August, 2004. The ESA revealed, through historical permitting documents, that an"existing fuel <br /> tank" had been located just north of the current shop building. The tank was reportedly an UST <br /> that was removed in 2000. No documentation was available to indicate whether soil samples <br /> were collected and analyzed for the presence of petroleum hydrocarbon contamination. No <br /> records of the exact locations of the former tanks and/or dispensers had been made available to <br /> AEI. The ESA recommended that soil samples be collected from the area of the former UST to <br /> investigate whether any contamination is present on-site in association with the former UST. <br /> SCOPE OF WORK <br /> The investigation will consist of the collection of soil and groundwater samples from temporary <br /> soil borings. Groundwater samples will be analyzed to determine the presence or absence of <br /> petroleum hydrocarbons. The goal of the investigative activities is to determine if a hydrocarbon <br /> release occurred in the area of the former UST. <br /> Pre-drilling activities <br /> Prior to initiation of field drilling activities the locations of the soil borings will be clearly <br /> marked. At least 48 hours prior to the initiation of work, Underground Services Alert (USA <br /> North) will be notified. A drilling permit will be obtained from SJCEHD. <br /> Temporary Borings <br /> This phase is proposed to consist of the advancement of three (3) temporary soil borings (labeled <br /> SB-1 through SB-3), as shown on Figure 2. The locations of the borings were chosen to bracket <br /> the location of the former UST and determine if a release had occurred. <br /> Soil borings will be cleared by hand auger to a depth of 5-feet below the ground surface. The <br /> temporary borings will be advanced with a GeoprobeTM direct-push drilling rig by a California <br />