Laserfiche WebLink
The applicant claims the pit will be a "dry" operation. Reported drilling of test holes by <br />Lamben & Associates of Montrose, (we have as yet to be provided a copy oftheir report} <br />suggested to the applicant there was between 20 and 60 feet of depth to Marcos Shale <br />bedrock beneath the site. We believe these are reasonable estimates, as we observed <br />gravel in west fork of Mexican Gulch to be 20-30 feet in thickness. Tn the existing <br />Metcalf Pit, immediately east of the proposed operation ii is 50-b0 feet in depth. The <br />entire site is underlain by Marcos Shale beneath the gravels, with varying elevations on <br />the bedrock surface, i.e. erosion of the Mancos Shale surface was not planer, rather <br />undulating and channelized by previous flows of the Uncompaghrt: River. <br />The current hydrologic condi[ions are such that natural precipitation, non-consumed <br />irrigation application (approxitately 50%) and leakage from ditches and canals recharge <br />the mesa gravels. When this recharge encounters shale bedrock, satwates the gravels and <br />moves laterally down gradiant (usually in a direction sinular to the surface topography) it . <br />issues from springs at the base of the gravels along the arroyos which have eroded <br />through the gravels into the shale bedrock. A prime example of large rechargelurigation <br />return flow springs are those at Silver Springs Trout Farm, which flow at rates varying <br />from 500 to 1000 gpm after mid-irrigation season. <br />Testimony from local residents immediately east of the proposed pit indicate the Metcalf <br />Pit, which now contains an excavated pond at it's base, fills with water during spring and <br />summer months and water levels decline once imgation season terminates, until it is dry <br />(last year) from late fall through winter. "this has been observed in numerous locations <br />along the run of Spring Creek Mesa, including springs on the Bean Ranch. Phyreatophyte <br />(water seeking) vegetation located in the arroyos southeast of the Pit, and more <br />particularly in'the small arroyo located at the Metcalf Pit northward to Lasalle Road (and <br />beyond on the Appleharu'Farm) are obvious testunony to the semi-perennial natwe of <br />groundwater discharge along the Nlesa. Prior to the USBR "winter stock water program", <br />which supplied domestic water taps for stock itt automatic waterers, ditch and canal <br />leakage alone kept many springs running all year. , <br />The Hillside Homestead (owned by Joyce and Harold Nation} is located in the NWI/4, <br />NW ll4, Section 19, immediately adjacent to and east of 6200 Road, the eastern proposed <br />boundary of the Pit. The Nation's have adjudicated water rights on.several sgiings and <br />ponds under Division 4 District Water Court in Case #93CW242. Water Judge Robert <br />Brown decreed the springs aztd ponds absolute on June 15, 1994. The decree specifies <br />and spells out the operation of the springs and ponds as issuing surface water beginning <br />in spring through summer and fall nwnths. The water is adjudicated for wildlife, <br />livestock, irrigation and sub-irrigation of wetlands. Flows from the springs are <br />individually adjudicated as high as 0.30 cfs (135 gpm}, with storage tights of up to 0.42 <br />acre-feet in Otte pond alone. The elevation of the Nation Springs and ponds is <br />approximately 50 feet below Spring Creek Mesa surface. The elevation of the water Ievei <br />in the ittetcalf Pit Pond is similar. We have concluded that there can be no other source <br />for these water rights but subsurface irrigation water recharge from irrigated lands to the <br />west and southwest. In addition, the $ean Springy (observed} also receives recharge and <br />flows from irrigated lands to the west. The excavation of this gravel deposit to shale <br />