2018-07-13_INSPECTION - M2008082

• Permit No: M2008082
• IBM Index Class Name: Inspection
• Doc Date: 7/13/2018
• Doc Name Note: Corrective Action
• From: RMCC
• To: DRMS
• Email Name: ECS
• Media Type: D
• Archive: No

Joe Lamanna
July 11, 2018
Page 3
Pump Retesting Investigation
On June 28, 2018, BBA accessed the A&W well to complete a step-test for the follow-up testing
which included operating the well at various pumping rates and collecting static and pumping
water levels. Prior to the step-test, a static water level of 13.88 feet below the ground surface was
measured in the well. The well was operated at pumping rates of approximately 200 gpm, 300
gpm, 380 gpm, 390 gpm and 415 gpm for 20 minutes each. No pump cavitation was observed
during the step testing. Based on the water level and pumping rate information collected during
the step-test a pumping rate of approximately 380 gpm was chosen for the constant discharge
pumping test for the well.
On June 29, 2018, BBA accessed the A&W well to complete a constant discharge pumping test
for the well. The A&W well had not been operated for approximately 12 hours before the start of
the testing. Prior to the pumping test,the static water level in the pumping well was approximately
13.76 feet below the ground surface. This water level is 4.33 feet higher than the water level
measured during the February test. During the constant discharge test, the well was operated at a
rate of approximately 375 gpm for a period of 8 hours. At the end of the constant discharge test,
the water level in the pumping well was approximately 28.21 feet below the ground surface for a
total drawdown of 14.45 feet. During the testing, a total of approximately 180,200 gallons were
pumped from the well.
Prior to the constant discharge pumping test, the static water level in the monitoring well was
approximately 11.29 feet below the ground surface. At the end of the constant discharge test, the
water level in the observation well was approximately 11.85 feet below the ground surface for a
total drawdown of 0.56 feet.
The water level data collected from the pumping and monitoring wells during the testing are
presented in the attached Table 1 and Table 2, respectively.
Data Analysis and Well Performance Projection
The pumping test data were analyzed to determine aquifer characteristics and identify achievable
pumping scenarios for the A&W well using the Theis type-curve method, as presented in the
attached Figures 2 and 3. Analysis of the corrected pumping well drawdown data (corrected to
adjust for declining aquifer transmissivity as the aquifer is dewatered) indicates an aquifer
transmissivity of approximately 573,000 gallons per day per foot and a storage coefficient,
representative of conditions in the pumping well, of approximately 1.9 *10-55. The monitoring
well pumping test data and analysis indicate that additional pumping time was needed to fully
analyze the monitoring well data. Accordingly,the monitoring well data analysis was not used for
the well performance projections.
Projections of well yield were completed using the aquifer characteristics determined from the
pumping well data, a static water level of 13.76 feet below the ground surface, an assumed pump
intake setting depth of 34 feet below the ground surface, a net positive suction head requirement
of 1.6 feet, a maximum pumping water Qel of 32.4 feet and the Theis equation. Projections of
potential well yields are presented in the table below.