Laserfiche WebLink
MEMORANDUM BBA <br /> BIS'HOP- BROGDEN ASSOCIATES, INC. <br /> To: Joe Lamanna <br /> From: Timothy A. Crawford <br /> Subject: Ready Mixed Concrete Company—Holton-Morton Lakes Site—A&W Well Retesting <br /> Summary <br /> Job: 0430.08 <br /> Date: July 11, 2018 <br /> This memorandum presents a summary of follow-up pump testing of the A&W Water Service, <br /> Inc. (A&W) well (Permit No. 61793-F) located north of the Ready Mixed Concrete Company <br /> (RMCC) Holton-Morton Lakes Site Stage 6A and 6B gravel pits, as presented in Figure 1. The <br /> well was pump tested on February 20, 2018 at a time when the Stage 6A and 6B gravel pits were <br /> completely dewatered. Since that time, RMCC has raised the water elevation in the Stage 6B pit <br /> to mitigate the potential adverse effects of dewatering to the A&W well. This retesting was <br /> performed to document current well performance in comparison to the prior pump testing and pre- <br /> mining conditions. This effort includes an analysis of the water level data to calculate aquifer <br /> characteristics and to project the current achievable yields for the A&W well. <br /> Executive Summary <br /> • In February of 2018, a pumping test was completed which indicated that the A&W well <br /> could be operated with rates as high as 350 gallons per minute (gpm) for short periods of <br /> time without pump cavitation and with longer-term rates of up to approximately 336 gpm <br /> and 312 gpm for pumping periods of 1-day and 30-days, respectively. Cavitation was <br /> observed at pumping rates in excess of 400 gallons per minute. <br /> • The static water level in the A&W well was 18.09 feet below the ground surface before the <br /> February 2018 testing and was 13.76 feet below the ground surface before the June 2018 <br /> testing which is 4.33 feet higher than the initial, February 2018 pump testing effort. <br /> • During the June 2018 testing, the A&W well was operated with pumping rates as high as <br /> 415 gpm. No cavitation was observed during the June 2018 pump testing. <br /> • Based on the June 2018 testing,the A&W well can be operated at projected pumping rates <br /> of up to approximately 428 gpm and 418 gpm for pumping periods of 1-day and 30-days, <br /> respectively. <br /> • The higher projected yields determined during the June 2018 pump testing efforts result <br /> from higher water levels, additional available drawdown and higher apparent <br /> transmissivities. <br /> • The A&W well is operating consistent with the pre-mining conditions based on the current <br /> pump testing efforts and a 2014 well rating pe formed by Quality Well and Pump. <br /> Mu 7W11 <br />