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N <br /> Site Background Information - Guardino and Crawford <br /> Page 6 of 6 <br /> of sandy material (silty sand, sand, and fine- to coarse-grained sand). This zone exhibits uniformly <br /> low pore pressures and may be considered a flow unit. <br /> QUARTERLY GROUND WATER MONITORING PROGRAM <br /> Quarterly ground water monitoring commenced at the site in July 1999; to date, twenty-eight ground <br /> water monitoring events have been conducted at the site. Ground water flow direction at the site has <br /> been consistently towards the northwest. Chemicals of concern (COCs) have been detected <br /> consistently only in wells MW- 1 and MW-2; the highest concentration of dissolved hydrocarbons <br /> continues to be in the area of the former UST; TPH-g, BTEX constituents and 1 ,2-DCA are present <br /> in significant concentrations in monitoring well MW4 . <br /> Advanced GeoEnvironmental, Inc. <br />