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                                  Keystone Lake
                          MONTHLY LAKE REPORT
                                 MAY 09


    POOL ELEVATIONS  STORAGE     RELEASES       EVAP  INFLOW   RAINFALL
DAY      FT-NGVD     2400HR         DSF        INCHES   ADJ     INCHES
      0800    2400    AC-FT   POWER    TOTAL  8A TO 8A  DSF    7A TO  7A
                                                               DAM   BSN
PRIOR MONTH  728.67   567978
 1   729.11  730.81   627742  12450    38619   0.000   68750   0.02  0.18
 2   731.87  733.39   706025  11804    33643   0.000   73100   0.36  0.44
 3   733.92  734.89   754768  11850    51547   0.000   76150   0.22  0.27
 4   735.33  736.53   810400  11600    44353   0.000   72400   0.01  0.02
 5   737.03  738.18   869136  11417    30499   0.030   60100   0.10  0.16

 6   738.65  739.23   907865   9579    24992   0.000   44700   0.06  0.22
 7   739.37  739.34   911946   8904    24516   0.140   26700   0.01  0.00
 8   739.29  739.51   918356   3688    15825   0.140   19150   0.00  0.08
 9   739.59  739.87   932052      0    12224   0.060   19300   0.00  0.01
10   740.09  740.38   951455      0    12366   0.150   22200   0.00  0.01

11   740.50  740.71   964319      0    12475   0.070   19100   0.01  0.14
12   740.78  741.08   978764      0    12563   0.120   19900   0.00  0.00
13   741.29  741.89  1010866      0    12720   0.030   29250   0.08  0.08
14   742.19  742.76  1046046      0    12977   0.300   30800   0.39  0.25
15   743.06  742.89  1051380      0    24377   0.070   27400   0.32  0.02

16   742.87  742.46  1033738      0    29814   0.270   21200   0.79  0.49
17   742.27  742.02  1016069      0    29464   0.220   20900   0.00  0.00
18   741.95  741.29   986961   4288    40703   0.290   26400   0.00  0.00
19   740.93  740.29   948030   8646    47844   0.320   28600   0.00  0.00
20   740.01  739.31   910832   8721    48243   0.350   29850   0.00  0.00

21   738.96  738.25   871665   8479    48307   0.340   28900   0.00  0.00
22   737.86  737.18   833231  10654    45851   0.290   26800   0.00  0.00
23   736.76  735.89   788413  11642    43612   0.320   21200   0.00  0.00
24   735.46  734.60   745152  11671    42460   0.200   20850   0.00  0.00
25   734.16  733.28   702592  11783    41231   0.200   20850   0.00  0.01

26   732.83  732.30   672106  11875    35956   0.180   19950   0.00  0.17
27   732.08  731.60   650969  11838    29796   0.270   19200   0.00  0.02
28   731.34  730.74   625703  11875    29560   0.070   17050   0.00  0.00
29   730.46  730.18   609616  11900    24670   0.250   16850   0.00  0.00
30   730.10  729.84   600064  11800    19919   0.390   15500   0.00  0.00
31   729.59  728.93   575003  11842    19736   0.430    7440   0.00  0.00

TOTAL                        228306   940862   5.500  950540   2.37  2.57
AVERAGE   737.08               7365    30350           30663 NORMAL= 4.42

MAXIMUM   743.06     1058355   DATE=15    TOP CONSERVATION POOL    723.00
MINIMUM   728.67      567978   DATE= 1    TOP FLOOD POOL           754.00

                      INFLOW VOLUME=  1885368 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION