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OBJECTIVES AND SCOPE OF WORK <br /> ' The objectives of this field investigation were to <br /> ' • Attempt to determine the shallow groundwater direction and hydraulic gradient to enable <br /> the prediction of the movement of contaminant in the first groundwater beneath the site <br /> t • Further define the magnitude and lateral extent of petroleum hydrocarbon impact of the <br /> ' first groundwater beneath the site <br /> ' To achieve the above objectives additional monitoring wells were installed and the following <br /> scope of work was performed <br /> • The collection of monitoring data and surveying data from monitoring well MW-1 and <br /> ' two irrigation wells, the one closest to the former tank pit (shown on Figure 2), and the <br /> well north of the former tank pit, and estimation of the hydraulic gradient and flow <br /> direction for the site <br /> ' • The drilling of two soil borings, one in the calculated downgradient direction from the <br /> former tank locations, completing the borings as monitoring wells Selected soil samples <br /> ' collected from the borings were analyzed for benzene, toluene, ethylbenzene and xylenes <br /> (BTEX) and total petroleum hydrocarbons as gasoline (TPHG) by EPA methods 8020 <br /> ' and modified 8015, respectively <br /> ' • The collection and analysis the groundwater samples collected from each monitoring well <br /> for BTEX and TPHG by EPA methods 8020 and modified 8015, respectively <br /> MONITORING WELL INSTALLATION AND DEVELOPMENT <br /> tDue to the lack of consistent local groundwater gradient data, prior to drilling RESNA surveyed <br /> and monitored well MW1 and two of the irrigation wells on site Hydraulic gradient and flow <br /> direction estimated from the monitoring data and historical data from nearby sites was used to <br /> select the optimal locations for the proposed monitoring wells Potentiometric surface between <br /> tR 052992 LF 5 <br />