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18 July 2002 <br /> AGE-NC Project No 95-0109 <br /> Page 3 of 8 <br /> Benzene was detected only in the ground water samples collected within HU2 from boring CPT-2, <br /> at concentrations as high as 2 7 µg/l Benzene was not detected in the ground water sample collected <br /> within HU3 from CPT-2, or in any other water samples collected during the investigation The <br /> vertical extent of benzene-impacted ground water has been defined Analytical results of the CPT <br /> grab ground water samples are summarized in Table 1 Historical ground water data 1s presented in <br /> Tables 2 through 5 <br /> 3.0. SCOPE OF WORK <br /> In order to verify the lateral and vertical extent of impacted ground water downgradient of the site, <br /> one ground water monitoring well cluster will be installed on the southern portion of the site near <br /> well MW-8, and one momtonng well cluster will be installed off-site near the location of CPT-3 <br /> The assessment activities will consist of the following tasks <br /> • Permitting and pre-field work preparations, <br /> • Monitoring well installation and sampling,-and <br /> . • Report preparation <br /> Each of these tasks is described in greater detail below <br /> 3 1 PRE-FIELD WORK PREPARATIONS <br /> AGE will acquire all proper city/county drilling and building permits, and the health and safety plan <br /> will be updated in accordance with Occupational Safety and Health Guidance Manual for <br /> Hazardous Waste Site Activities (National Institute for Occupational Safety and Health <br /> Administration, U S Coast Guard and U S Environmental Protection Agency, 1985) Prior to <br /> mobilization,the boring and monitoring well locations will be clearly marked and a utility clearance <br /> obtained through Underground Service Alert <br /> 3 2 MONITORING WELL DRILLING AND SOIL SAMPLING <br /> AGE proposes to install two ground water monitoring well clusters on- and off-site to verify the <br /> lateral and vertical extent of impacted ground water downgradient of the site Based on the results <br /> of the CPT investigation, AGE proposes a ground water monitoring well cluster consisting of two <br /> monitoring wells in the area of monitoring well MW-8 and one monitoring well cluster consisting <br /> of three wells in the area of boring CPT-3 The proposed well locations are illustrated in Figure 1 <br /> Advanced CeoEnvironmental,Inc <br /> r <br />