Laserfiche WebLink
<br /> McKay Road <br /> 8 <br /> 0 well1A <br /> 6 0 well1B <br /> 0 /::,. well2A <br /> 4 T well 28 <br /> 0 T T <br /> ~ T ~ T fj <br /> 2 <br />cfj ~ <br />::::>en 0 0 0 a 0 <br />0:::::> 0 <br />00: 0 <br />:1:0 <br />"-:I: Henderson <br />en,,- <br />oen 8 <br />:1:0 <br />"-:I: <br />0"- <br />wen 6 <br />~<( <br />00: <br />enW <br />ene 4 <br />-...J <br />00: <br />"-w <br />0"- 2 /::,. /::,. <br />zen <br />0:2: /::,. ~ <br />-<( T T <br />!;(o: <br />0:(9 0 <br />f-:J Road 8 <br />Z...J <br />W- 8 <br />u:2: <br />Zz <br />0- <br />u 6 <br /> 4 <br /> 2 <br /> 0 <br /> 8/1/92 10/1/92 12/1/92 2/1/93 4/1/93 6/1/93 8/1/93 <br /> DATE <br />Figure 11. Concentrations of dissolved phosphorus in water from wells at McKay Road, Henderson, and Road 8. <br /> <br />r\!',fl~") <br /><J,..,..... ...<J <br /> <br /> <br /> <br />indicating that advective movement of surface water <br />into underlying sediments would increase organic car- <br />bon concentrations in ground water in the sediments. <br />Changes in flow directions in the small-area flow sys- <br />tem may have allowed river water to infiltrate the bed <br />sediments. Concentrations of total organic carbon <br />decrease with depth below the sediment/water inter- <br />face, indicating that the river could have acted as a <br />source of organic carbon when it infiltrated the sedi- <br />ments, The presence of relatively high concentrations <br />of organic carbon in water and sediments in all of the <br />McKay Road samples probably explains why there was <br />little DO in any water samples from that site. <br /> <br /> <br /> <br /> <br />The process of DO removal in the small-area <br />flow system affected DO concentrations in the river in <br />at least two ways. The mass-balance example given in <br />the "Large-Area Flow System" section indicated that <br />ground-water discharge to the river would lower DO <br />concentrations in the river between 104th Avenue and <br />Highway 52 from 8.5 to 7.0 mgIL. However, in that <br />mass-balance example, the concentration of DO <br />chosen for ground-water discharge was 2.5 mgIL, <br />which was the median concentration of DO in water <br />from the lA/lB wells at Henderson and Road 8. !fthe <br />median DO concentration (0.2 mgIL) measured in <br />water from the small-area flow system is used as the <br />DO concentration for ground-water discharge from the <br /> <br />QUALITY OF GROUND-WATER DISCHARGE 25 <br />