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GEOMATRIX <br /> groundwater sample collected from B3-1 at about 22 feet was also analyzed for oxygenates, <br />' which were not detected in the sample <br />' 1999 <br /> Based on the results of the 1998 site assessment, the PHS/EHD requested additional site <br />' investigation In 1999, three groundwater monitoring wells (MW3-1, MW3-2, and MW3-3) <br /> were installed in the vicinity of the former UST area (Figure 2) (Ross, 1999) The 35-foot <br /> deep wells are constructed with 25-foot-long screens at the bottom BTEX and TPHg were <br />' detected in the soil samples collected at about 25 and 30 feet bgs from the borings for these <br /> wells. Groundwater samples were collected from these wells after installation BTEX and <br /> TPHg were detected, and MtBE and oxygenates were not detected in these groundwater <br /> samples <br />' The Port has been monitoring and sampling these wells on a quarterly basis since 1999 <br /> (Port, 2003) Groundwater samples collected from the monitoring wells have been analyzed <br />' for TPHg and BTEX, and on several occasions for MtBE MtBE has not been detected in the <br /> groundwater samples analyzed Depth to water in the wells has ranged from about 9 to 16 feet <br /> bgs Horizontal groundwater flow directions have been variable, ranging from northwest <br /> clockwise to southwest Groundwater gradients have also been variable, ranging from about <br />' 0 004 to 0 035 foot per foot No seasonality is apparent in the groundwater flow direction or <br /> gradient MtBE has not been detected in the groundwater samples collected from the <br /> monitoring wells TPHg and BTEX concentrations in the groundwater samples collected from <br /> the monitoring wells do not indicate apparent increasing trends <br /> 2001 <br /> After a review of the quarterly groundwater monitoring reports prepared by the Port, the <br />' PHS/EHD requested an assessment to delineate the lateral and vertical extent of petroleum <br /> hydrocarbons in soil and groundwater at the site Four soil borings (B3-4 through B3-7, <br />' Figure 2) were advanced to about 40 feet bgs in 2001 (Geomatnx, 2002c). Soil and grab <br /> groundwater samples were collected at about 20 and 40 feet bgs in these borings TPHg and <br />' BTEX were not detected in the soil and grab groundwater samples collected from borings <br /> B3-4 and B3-7 TPHg and BTEX were detected in the soil and grab groundwater samples <br /> collected at about 15 to 20 feet bgs from borings B3-5 and B3-6, but were not detected in the <br />' soil samples collected at about 40 feet bgs from these two borings <br /> 0 <br /> 1 <br /> 11PROJECT\6000s\6437 00016437-08 dm 4 <br />