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_ovv_ <br /> CLEARWATER <br /> � R0 <br /> £nv"."Menfaf Serveces <br /> All field-work was conducted in accordance with Clearwater's Groundwater Monitoring and <br /> Sampling Field Procedures and Natural Attenuation Processes and Recommended Monitoring <br /> Guidelines (Attachment B) Groundwater monitoring and well purging information are <br /> presented in Tables 2 and 3 and on Gauge Data/Purge Calculations and Purge Data sheets <br /> (Attachment C) <br /> Groundwater Monitoring and Sampling Results <br /> On March 7, 2006 static groundwater in the wells was observed in the vicinity of the site at <br /> depths ranging from approximately 7 03 feet below ground surface (bgs) in MW-2 to 10 00 feet <br /> bgs in MW-8 Gauging data, combined with well elevation data, was used to calculate <br /> groundwater elevations in these wells, and to generate a groundwater elevation contour map <br /> The groundwater flow direction was calculated to be toward the southeast at a gradient of 0 015 <br /> feet per foot (ft/ft) (Figure 3) <br /> The laboratory reported levels of benzene above the laboratory reporting limit of 0 50 gg/L in the <br /> samples collected from MW-513 (1,700 µg/L) and MW-8 (1 8 gg/L) A dissolved-phase benzene <br /> iso-contour map is included (Figure 4) Concentrations of TPHg detected above the laboratory <br /> reporting limit of 50 micrograms per liter (gg/L) were reported for the groundwater samples <br /> collected from MW-5B, MW-7 and MW-8 The detectable concentrations range in value from <br /> 290 µg/L (MW-8) to 13,000 µg/L (MW-5B) (Figure 5). Various concentrations of toluene, <br /> ethylbenzene and xylenes above the laboratory reporting limit of 0 50 µg/L were reported for the <br /> samples collected from MW-513 The laboratory reported a concentration of MTBE in the <br /> samples collected from MW-1 above the standard reporting limit of 0 50 gg/L Well <br /> construction details for both the groundwater monitoring wells and the iSOCrM system wells are <br /> presented in Table 1 Current and historical groundwater elevation and analytical data for MW-1 <br /> through MW-8 is summarized on Table 2 A copy of Kiff Analytical LLC laboratory report <br /> number 48793 is included (Attachment D). <br /> ZB178I 3 of 10 May 2006 <br />