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S..001 <br /> 17 July 1997 <br /> AGE-NC Project No. 97-0324 <br /> Page 3 of 6 <br /> below. The following information on the site was on record with the PHS-EHD. <br /> Sierra Lumber, 375 West Hazleton Avenue directly south of the ro ert <br /> One 1,000-gallon UST was removed from the site in August 1988. Hydrocarbon impacted <br /> soil was encountered during removal of the UST. Subsequently, one soil boring was <br /> advanced at the site in June 1994. Hydrocarbons were detected in soil and a grab ground <br /> water sample collected from the boring. <br /> Three ground water monitoring wells were installed on the'site in October 1994. Impacted <br /> groundwater has been detected in all sampling events continually since the monitoring wells <br /> were installed. The reported ground water flow direction is typically west; however the most <br /> recent flow direction calculated was toward the east. The lateral extent of the hydrocarbon- <br /> impact on the site has not been determined at the site. No further information was available <br /> from files on record ,,ith the PHS-EHD. <br /> 3.0. REGIONAL GROUND WATER DEPTH <br /> The estimated depth to ground water at this property is approximately 10 to 15 feet below surface <br /> grade (bsg), based on information from Lines of Equal Depth of Water Wells, Fall 1993 published <br /> by the San Joaquin County Flood Control District and Water Conservation District. The PHS-EHD <br /> uses the depth to ground water to calculate the potential impact to ground water from both surface <br /> and subsurface release of hazardous substances. <br /> 4.0. SCOPE OF WORK <br /> 4.1. PROBING AND SAMPLING <br /> Due to the close proximity of the Sierra Lumber UST petroleum hydrocarbon release to the site there <br /> is a potential of a subsurface impact to the site. AGE proposes to advance a minimuill of three soil <br /> probe borings at the site. The subsurface investigation at the site is necessary to determine if soil <br /> and/or ground water at the site has been impacted by hydrocarbons. <br /> Probe borings will be advanced to depths of approximately 25 feet (below ground water), using <br /> direct push technology (DPT). Three probe boring will be advanced near the southern border of the <br /> site. All probe borings will be advanced using a Geoprobe probing unit equipped with 1.125-inch <br /> probe rods. The proposed probe boring locations are illustrated in Figure 2. <br /> Soil samples will be collected at five-foot intervals, beginning at five feet bsg using a Geoprobe <br />