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Mr. Tom Horton Project 939-01.11 <br /> September 9, 1992 <br /> Page 2 <br /> the precipitation season and field measured for turbidity, settleable solids, <br /> pH, and electrical conductivity (EC). Surface-water sampling locations are <br /> shown on Drawing 1. Samples were collected and field measurements <br /> were taken on March 6, 1992, after a significant storm event. The analyti- <br /> cal results from the March 6, 1992, surface-water runoff monitoring event <br /> were included in our second quarter and annual 1992 report. These meas- <br /> urements were collected to satisfy the surface water requirements for the <br /> ' 1991 to 1992 precipitation season. Samples will also be collected when <br /> the precipitation season (October through April) begins in 1992. The pro- <br /> cedures used to collect and analyze samples at the San Joaquin County <br /> ' landfills are contained in Attachment A. <br /> Water sample field data sheets are contained in Attachment B. Chemical <br /> analyses were performed by Columbia Analytical Services, Inc., a state- <br /> certified analytical laboratory. Certified analytical reports and chain-of- <br /> custody records are contained in Attachment C. <br /> MONITORING LTS <br /> The monitoring results for the third quarter 1992 monitoringevent arepre- <br /> sented in Table 1. The ground-water samples were analyzed for the <br /> following quarterly parameters specified in WDR order no. 87-088: chlo- <br /> ride, total dissolved solids (TDS), total hardness, chemical oxygen <br /> demand (COD), and total nitrogen. EC and pH were measured in the field. <br /> Samples collected from well MW-4 contained higher levels of EC, chlo- <br /> rides, COD, total hardness, and TDS than samples collected from the <br /> other site wells this quarter. Similar levels of pH were found in all four site <br /> ' wells. Well MW-1 contained a slightly higher concentration of total nitrogen <br /> than the other site wells. <br /> The monitoring results from this quarter's monitoring were generally similar <br /> to those found during previous quarterly monitoring events (see <br /> Attachment D). <br /> GROUND-WATER FLOW DIRECTION AND VELOCITY <br /> Based on ground-water elevations measured on August 3, 1992, the <br /> direction of ground-water flow on site is inferred to be toward the south- <br /> west. Drawing 1 shows the ground-water contours. The ground-water flow <br /> velocity was calculated to be 127 feet per year based on Darcy's Law. <br /> pj9\939\9390111 c <br />