SITE HISTORY - Laserfiche WebLink

Home Browse Search

• Slowly lower a close- fitt'm sur e block into thewell until it rests below the static water level, but above the screened'interval, if possible. • Begin a gentle surging motion that will allow any material blocking the screen to break up, go into suspension, and move into the well. Continue surging for 5-10 minutes, remove surge block, and pump or bail the well, rapidly removing at least one well volume. • Repeat previous step at successively lower levels within the well screen until the bottom of the well is reached. Note that development should always begin above, or.at the top of, the screen and move progressively downward to prevent the surge block from becoming sand locked in the well casing. As development progresses, successive surging can be more vigorous and of longer duration as long as the amount of sediment in the screen is kept to a minimum. • At a minimum, 3 to 5 well volumes are removed during development. WATER QUALITY MONITORING • Monitor water quality parameters before beginning development procedures, and after removing each well volume. • If water quality parameters have stabilized over the three readings, the well will be considered developed. _ • If the parameters have not stabilized after these three readings, continue pumping the well to develop, but stop surging.,.Monitor the stabilization parameters every one-half well volume. I When the parameters have stabilized over three consecutive readings at one-half well volume intervals the well is considered developed. e eloped. DOCUMENTATION Record all data as required on a Monitoring Well Developing Record These data include: • Depths and dimensions of the well, the casing, and the screen, obtained from the Monitoring Well Construction Form. • Water losses and uses during drilling,obtained from the boring log for the well. • Water levels. I Page 2 of 3 well_dev_SOP MONITORING WELL DEVELOPMENT February 2005