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<br />sistently between quarterly measurements. The Y-axis of the <br />graphs is the depth to water plotted as a negative number <br />which assumes the top of each piezometer is elevation 0.00. <br />This allows the plotted points to actually appear as a in- <br />creasing or decreasing water level. <br />Q. The moderately elevated water levels in piezometer P-1 and <br />the minimal and infrequent discharge of the north underdrain <br />may suggest that the north drain system is clogged. What do <br />you believe these two factors indicate and why? <br />A. The underdrain may not be clogged. Its north south collec- <br />tion drain may not have been installed far enough to the <br />north to intercept a source of water. Alluvium on the north <br />edge of the bench appears to carry water near the surface <br />down slope until it surfaces near P-1. <br />If you have any questions about this data please let me know. <br />Sincerely, <br />Jim Stover, P.E. <br />Chief Engineer <br />Enclosures <br />