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Page 6 <br /> City of Manteca Well #8 <br /> Water Levels <br /> Month & Year <br /> 50 <br /> w <br /> 45 4 0 <br /> ■ <br /> ■ ■ <br /> ■ ■ ■� <br /> Depth from ■ <br /> Surface MMM on, <br /> , ■ ', <br /> MM <br /> 3 0 w , ■: ■ ■ <br /> ■■■■ OMEN <br /> ■ <br /> 25 ■■ <br /> Sep- Mar- Oct- Apr- Nov- Jun- Dec- Jul- Jan- Aug- Feb- <br /> 86 87 87 88 88 89 89 90 91 91 92 <br /> Groundwater levels appear to fluctuate with the growing season due to agricultural <br /> drawdown, and annual groundwater level averages have generally been rising since <br /> 1987 Average groundwater levels at Well #8 are between 33 and 35 feet BGS for the <br /> five year period Groundwater levels at 890 North Main Street have fallen from 13 <br /> feet BGS in 1987 to 29' in 1991 However, there may be seasonal fluctuations at the <br /> study property that were not detected because only one measurement was obtained <br /> (except for 1989) each year. <br /> Groundwater Pump Test <br /> A groundwater pump test was performed on October 15th and 16th to investigate <br /> the aquifer response to severe drawdown fluctuation Prior to the test, verbal <br /> permission was obtained from the South San Joaquin Irrigation District and the City <br /> of Manteca Public Works Department to discharge the groundwater to a storm <br /> drain The storm drain adjacent to the property on North Main Street was used. A <br /> Grunfos pump was placed in Monitoring Well 4 at a depth below the lowest point of <br /> Monitoring Wells 1, 2, and 3. The pump test settings are listed below: <br /> Well Well Well Well <br /> Depth to Bottom 32.20' 33.20' 32 04' 37.28' <br /> Depth to Water 28 97' 28 85' 29.28' 29 55' <br /> Depth of Pump - - - 36.00'* <br /> Depth of Probe 31.0' 32.1' 310" <br /> * Measured from the pump bottom <br /> Parker Environmental ServlCes 4185 Rialto Court Pittsburg CA 94565-6116 <br /> Phone (510) 439-1024 Fax (510) 439-2566 <br />