Laserfiche WebLink
in 2007 NCCI installed a recharge ditch along the South side of the gravel mine (WCR 18) and along <br />the east side of the gravel mine (WCR 25) to the entrance of the mine. This was done in accordance <br />with TR03. In 2009 NCCI installed three (3) new sediment ponds in the North east part of the large <br />mining area along with a recharge ditch along the North side of the large mining area and then <br />running North to the Little Dry Creek along the east side of the smaller mining area. This was done in <br />accordance with TR04. There are three areas surrounding the gravel mine that present problems in <br />maintaining ground water depths. On the South side of the large mining area is the drainage ditch <br />from Sand Hill Reservoir. During the summer months for a few days each month this ditch will carry <br />a large volume of water which will raise the water table significantly. When there is no water running <br />in the ditch the ground water table will drop significantly and change very rapidly. On the west side <br />of the gravel mine is the Little Dry Creek. In the summer months this creek runs very high carrying <br />irrigation water, augmentation water and storm run off water. Little Dry Creek floods much of the <br />property on the west side of the gravel mine and raises the ground water significantly. In the winter <br />months there is very little flow of water in Little Dry Creek and this drops the ground water table <br />depths very significantly. On the North side of the large gravel mining area the local farmer grows <br />hay. From May through September on a regular basis the hay field is flood irrigated. Again this has a <br />significant impact on the ground water table going up and down in a short period of time. These three <br />areas have a big impact on NCCI's monitoring wells. With these conditions the benchmark levels <br />become difficult to monitor and sometimes to maintain. The benchmarks established at this point are <br />reflecting some sever ground water depth changes that occur around the gravel mining area. <br />NCCI appreciates your consideration of this adequacy review comment response and looks forward to <br />your response. A hard copy will be placed in the mail following this email. <br />Please contact me with any questions or comments. <br />Si er ly, <br />ouglas D Graff, Senior ecutive <br />Summary of attachments: <br />Updated Mining Plan Map <br />Monitoring Well Data including Bench Marks <br />CC: Chris Zadel, NCC <br />Stacy Churchill, NCC