Evaluation of Groundwater Supply Alternatives Within Bernal Subbasin

Testing, Sampling, and Analysis Plan January 15, 2025 2 Zone 7 Water Agency and City of Pleasanton plus or minus 5 percent of the pump test rate by means of an approved gate valve in concert with engine speed. b. Throughout the test, the Contractor shall frequently record flow rate and totalizer readings to ensure that the pumping rate remains constant. C. Measurements a. The Contractor shall measure the depth to water to the nearest 0.01 feet, flow rate, and sand content at the time intervals specified herein. b. Each well test shall be monitored by the Contractor with data recorded according to the following applicable time schedules: i. Turn the pump on to the approved test pumping capacity at time (t) = 0. ii. The contractor shall measure and record the depth to water as follows: 1. each minute, from t = 1 to t = 10. 2. each 2 minutes, from t = 10 to t = 20. 3. each 5 minutes from t = 20 to t = 50. 4. each 10 minutes from t = 50 to t = 100. 5. at t = 120, t = 150, t = 180, t = 240, and t = 300. 6. each 100 minutes after t = 300. c. Each recovery test shall be recorded according to the following applicable schedule: i. The contractor shall measure the depth to water and record as follows (t' refers to time since pump shut off): 1. each minute, t' = 1 to t' = 10 2. each 2 minutes, t' = 10 to t' = 20 3. each 5 minutes, t' = 20 to t' = 50 4. each 10 minutes, t' = 50 to t' = 100 5. at t' = 120, t' = 150, t' = 180, t' = 240, t' = 300 D. Pump Failure a. In the case of failure or interruption of the pump operation for a period greater than one (1) percent of the elapsed pumping time from t = 0, the test shall be suspended until the static water level has been attained. Should the test be aborted as a result of a deficiency on the part of the Contractor's equipment or personnel, all time consumed in waiting for complete water level recovery and in resuming the pump test to the point where it was aborted shall be at no cost to the Owner. E. Completion a. After the well testing has been completed, the record of water level measurements shall be delivered to the Engineer on the forms provided as part of these documents. The test pump shall not be removed from the well until the Engineer has evaluated the data and authorized its removal.