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Figure 5 — Drawdown in Observation Well 8 <br />Drawdown in Observation Well 8 <br />-2400 feet from pumping well (Well 7) <br />840 October 19. 2019 <br />835 <br />m <br />830 <br />> <br />w <br />825 <br />J <br />m 820 <br />815 <br />CO CO CO CO CO (0 (0 CO CO CO CO (D CO CO CO CO r CO CO O CO CO C7 (O (0 (O CD CO CO cD CO CO 0) CO CO CO CO (D CO CO <br />'I'd' 7 (fJ (f) uo O O ,—N N M M 7 7 7 (n (n (n O (n O O O N N M M M M 7 7 (n (n (C) O O <br />O CO CO 00 CO c01� LC) (D M MDI c hh(-- LC) tnM M77N CV CV 000 0000 CA CO CO CO C, NMI <br />l O M co co N (NI (NI� � 0 0 (O I O co co N N N � � O O O l f) l n l n 7 7 CV CV CV� � � O O 1 f) (n 7 <br />1�00 co of [A O)(A OONN MMM 777 (n (.()(r7 (n (n (n CO (flan N- � CO CO c0LT) 00)CS) 00 <br />Time <br />N <br />During the course of Well 7 pumping, Well 8 at a distance of 2,400 feet observed approximately 6 <br />to 9 feet of drawdown. <br />The Theis equation predicts a cone of depression approximately 2,448 feet from pumping well 7. <br />Theis Equation for the City of Ramsey <br />Time = 0.5 days <br />Theis W(u) Function 0.752 unitless <br />Drawdown = 6 ft <br />Transmissivity = 11493 gpd/ft <br />Pumping Rate = 800 gpm <br />Theis u variable = 0.390 unitless <br />r2 = 4Ttu 4S <br />Storativity = 0.0002 unitless <br />Radius rounded for <br />map <br />2400 ft <br />These results indicate that a single well pumping at current well field spacing does not induce <br />mutual well interference. This 6-foot cone of depression is depicted on Figure 11. <br />However, complexities arise as present-day conditions see the use of 3 to 5 concurrent wells, <br />and a 2040 demand increasing up to a projected 500% daily maximum demand. In order to <br />model these scenarios and their resulting cone of depressions a groundwater model was <br />developed. <br />FEASIBILITY STUDY RAMSY 154354 <br />Page 22 <br />