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F <br /> F <br /> p1 . Introduction <br /> In 1994,in order to satisfy the groundwater related conditions of the Permit No. QX-91-5 (the permit) <br /> issued by San Joaquin County Environmental Health Division in late 1992, Teichert Aggregates retained <br /> Luhdorff and Scalmauini, Consulting Engineers(LSCE)to establish and monitor a network of wells for <br /> groundwater levels and quality in the vicinity of the Teichert Vernalis plant(Figure 1). The objective of <br /> the monitoring program, as presented in the permit,was to document the status of groundwater conditions <br /> within the greater perimeter of the permitted mining area; groundwater was to be monitored on a quarterly <br /> basis and results reported on an annual basis. The area monitored in this program encompasses the seven <br /> permitted mining phases and extends three miles north to south from Kenner Road to the intersection of <br /> } <br /> Interstates 5 and 580 and extends two miles west to cast from Bird Road to Koster Road. The monitoring <br /> I program,initiated in March 1994 and conducted through to the present, includes groundwater level <br /> measurements and groundwater quality sampling and analyses, specifically for general minerals,nitrate, <br /> Fselected metals,and coliform bacteria. <br /> I The groundwater monitoring has been conducted in a network of water supply wells in the area, including <br /> the Vernalis plant primary production wells and neighbors' irrigation and domestic wells, which are <br /> F completed in the alluvial aquifer at varying depths. The initial groundwater monitoring data from the <br /> network wells facilitated the characterization of groundwater level and quality fluctuations prior to <br /> I mining operations. Since the commencement of mining on the Lone Tree II mining phase in 1998,the <br /> monitoring has provided for the continued evaluation of groundwater conditions. <br /> F <br /> SCPINNEDA <br />{ F <br /> F <br /> Fit <br /> Ft <br /> F <br /> LLHDORFF & SCALMANINI <br /> CONSULTING ENGINEERS 1 <br /> i <br />