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c:) <br /> cn c� - <br /> r-rt :c; <br /> _a <br /> I. Introduction <br /> In 1994, in order to satisfy the ground-water related conditions of Permit No. QX-91-5 issued by San <br /> Joaquin County Environmental Health Division in late 1992,Teichert Aggregates retained Luhdorff <br /> n and Scalmanini, Consulting Engineers (LSCE) to establish and monitor a network of wells for <br /> ground-water levels and quality in the vicinity of the Teichert Vernalis plant (Figure 1). The <br /> objective of the monitoring program, as presented in the permit, was to document the status of <br /> ground-water conditions within the greater perimeter of the permitted mining area; ground water was <br /> n <br /> to be monitored on a quarterly basis and results reported on an annual basis. The area monitored in <br /> this program encompasses the seven permitted parcels and extends three miles north to south from <br /> Kenner Road to the intersection of Interstates 5 and 580 and extends two miles west to east from <br /> Bird Road to Koster Road. The monitoring program was initiated in March 1994 and has included <br /> seven years of ground-water quality sampling and analysis, specifically for general minerals, nitrate, <br /> and total coliform bacteria, and ground-water level measurements at approximately three month <br /> intervals during 1994 through early 2001. This is the seventh of a series of annual reports that began <br /> in 1995 in accordance with the permit requirements. <br /> A network of water supply wells in the surrounding area, including the Vernalis plant production <br /> n <br /> well and neighbors'irrigation and domestic wells, was established in early 1994. The network wells <br /> are completed in the alluvial aquifer at varying depths. The data collected from the network has <br /> facilitated the characterization of the ground-water level and quality fluctuations prior to mining <br /> operations and, with mining of the Lone Tree H parcel commencing in 1998, will allow for detection <br /> of any impacts on the aquifer during the ongoing mining operations. Since March of 1994, water <br /> levels have been measured and water quality tested in the network wells on a quarterly basis. The <br /> resultant data are presented in this report to describe ground-water conditions in the vicinity of the <br /> Vernalis plant. The report is organized as follows: a description of the monitoring network; <br /> © LUHOORFF & SCALMANINI <br /> CONSLILTING ENGINULRS <br />