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Section 2 2012 <br /> .t1�:�9a C`L SF' <br /> Local Hydrologic Overview <br /> Recent monitoring of groundwater measurements (1995-2010) indicates that the elevation to <br /> groundwater generally varies from 63 to 77 feet (NGVD29), with the land elevation being <br /> approximately 94 feet. It can be seen in Figure 2-2 that the ground water elevations vary <br /> significantly between wells, with MW 11 and MW 5 having the lowest and highest groundwater <br /> elevations, respectively. Additionally, there is significant "seasonality" to the data with the <br /> highest groundwater elevations generally being reported for all monitoring wells during the <br /> winter/spring and the lowest elevations reported during summer/fall seasons. The likely cause <br /> of this apparent seasonality is recharge during the winter wet months and summer pumping of <br /> agricultural wells during the summer and fall, when water demands are at their highest. There <br /> also appears to be a groundwater elevation relationship with the Stanislaus River stage, with <br /> high flows correlating in higher groundwater elevations. This influence could be due to higher <br /> water elevations influencing the groundwater gradient or the high water being a result of <br /> higher seasonal rain, recharging the ground water and independently increasing the river flows. <br /> It is also apparent that groundwater elevations have consistently been declining over the recent <br /> years with water levels dropping approximately 2-3 feet from 1995 to 2010. <br /> Figure 2-2: Historical Monitoring Well Groundwater Elevations. <br /> 2i WclL G ht vS4a --►—W4.I HAL: <br /> —Af0.1-3 WX113 Nr'-U <br /> 85 <br /> ��y��.1' '� '{ •`��� r I a*� �°''�r' � k.f` '��t�. p,r h� Jh i e J,„�,i+ *. ,� .�'L A�.: <br /> ti., i� = 1rTy w► w r <br /> �, ► I I 1kJ <br /> is <br /> _ �•_ t 3 � <br /> - i <br /> Vt <br /> 1.II <br /> ;0 Q <br /> f ,,[ , rye. <br /> l*�� �est •F� •r_ry� '.{Y��{' i f" 1'Y, ,,�� '•.�51 ?7 `.��15 1 r�i ��Rty f.' �" `l <br /> I4'3'' r•1' 49'• (y f'Y' �f �"1 (h''•Yaf' f� Rs.r+GYie 1�1' 1'<,.tiC'4e <br /> k ,ih :i% Y tiir <br /> Eco:logic,City of Riverbank 2009 Annual Report <br /> 6 City of Riverbank Waste Water Treatment Facility Background Water Quality Monitoring Well Work Plan <br />