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1995; W.W. Irwin, Inc. had recommended bioventing with continued groundwater monitoring as <br /> ><j the best, cost-effective technologies for cleanup of affected soil and groundwater. <br /> Ground-water monitoring was conducted for the first quarter of 1996 on January 16; the Project <br /> Status Report for that activity was issued on February 7, 1996. Groundwater monitoring was <br /> j conducted for the second quarter of 1996 on March 18. In an additional analysis, MTBE was not <br /> detected in the sample collected from MW-1. The Project Status Re ort for that activity, the last <br /> issued by W.W. Irwin, Inc.,was issued on April 4, 1996. <br /> r Horizon Environmental replaced W.W Irwin, Inc. as the consultant-of-record in June 1996. <br /> GROUNDWATER MONITORING: JULY 11, 1996 <br /> f= Sounding and Sampling <br /> Monitoring wells MW4, MW-5, MW-6, MW-7, and MW-8 were sounded on July 11, 1996 <br /> - utilizing a Solinsf1m, electronic, hand-held water-level indicator. Groundwater was sounded at an <br /> average depth of 15.77 feet below the tops of the well casings (see Table 1). The average depth- <br /> to-water <br /> epth- <br /> towater in the wells has increased 2.59 feet since March 18, when the average depth-to- water <br /> was 13.18 feet. Table 2 lists clock times of soundings for monitoring activities performed since <br /> September 19, 1994, with Stockton-corrected times and heights of highest & lowest tides. <br /> Horizon Field Methods and Procedures are included as Appendix A Monitoring Well Data Logs <br /> are included as Appendix B. <br /> The local groundwater flow direction on July 11, 1996 was approximately due east along a <br /> 4= gradient of 0.012. Between March 18 and July 11, the flow direction has shifted 20 to the east <br /> (see Figure 3). <br /> L-! <br /> -J <br /> .'i <br /> :1 <br /> HORIZON ENVIRONMENTAL,INC. 4 <br /> PROJECT NO.2005.41 <br /> JULY 1996 <br />