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1 . 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 Scalmanini,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 extends three miles <br /> north to south from Kenner Road to the intersection of Interstates 5 and 580 and extends two miles west <br /> to east from Bird Road to Koster Road. The monitoring program, initiated in March 1994 and conducted <br /> through to the present,includes groundwater level measurements and groundwater quality sampling and <br /> analyses, specifically for general minerals,nitrate, selected metals,and coliform bacteria. <br /> 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 /> 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 /> mining operations. Since the commencement of mining on the Lone Tree 11 mining phase in 1998,the <br /> monitoring has provided for the continued evaluation of groundwater conditions. <br /> ©LUHDORFF & SCALMANINI <br /> CONSULTING ENGINEERS 1 <br />