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pp APPEIVUIX B <br />6'U~~~Jf~~~ ~~" ~® •TER OFFICE MEMORANDUM <br />Cherry Creek Plaza I I <br />650 South Cherry Strc et, Suite 310 <br />Denver, Colorado 80222 <br />70: <br />FgOM. <br />DATE: <br />SUBJECT: <br />The T11 terrace most suitable for subirrigation along 4lilliams <br />and 613 rd Creek is relatively thin (i.e., < 50 feet across). <br />The T2 terrace is likely not subirrigated. For example, <br />alluvial monitoring holes A-1 and A-2 had static +•rater levels <br />of 13.2 feet and 21.1 feet, respectively (depth to water from <br />top of casing). It is surmised that water levels are currently <br />at their highest level with snotr<nelt runoff conditions and <br />the measurements occurring prior to the gro~•~ing season. <br />2. From field observations, the extent of agriculturally useful <br />species which are subirrigated appears to be very limited. <br />Vegetation on the relatively thin Tl terrace of 4!a rd and <br />llilliams Creeks is predominately brush and trees with some <br />grasses. Examples of vegetation collected at four sites <br />include the folio+~ring: <br />Site -1 - upstream of northern flume on hard Creek <br />- Kinickinic-upland plant (gro+•is generally in relation to <br />granite under pine) <br />- Carex sp.-phreatophyte <br />Grand Mesa Coal Company File <br />Dan B. Kimball~(~- <br />April 6, 1982 <br />COPIES <br />EXTENT OF SUBIRRIGATION ADJACENT TO 4JILLIAMS AND b1.4RD CP,EEY,S At•JD <br />NEED FOR TEST PITS <br />Based on reconnaissance-level field investigations of vegetation and <br />landform conducted on March 25 & 26, 1982, it is recommended at this <br />time that test pits not be installed at various points along I•Jilliams <br />Creek and l•lard Creek to study subirrigation for the reasons noted <br />below. (The piezometers to be installed along the road west of <br />Brimstone Corner and as more detailed vegetation survey will provide <br />information to make more definitive conclusions as to the extent and <br />importance of subirrigation.) <br />Site =2 - adjacent to 41ard Creek on Tl terrace north of <br />road (east-+•rest road at Brimstone Corner) <br />- Sno+~~berry <br />- Juniper <br />- Big Sage <br />12 <br />