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Nolte and Associates, Inc. • • MONITORING WELLS of well development shall be submitted to the Engineer within seven working days after development. B. Development Details 1. Development shall be accomplished with a pump and/or a bottom discharge/filling bailer (for sediment removal) and surge block. 2. Development shall proceed in the manner described below and continue until the following are met: a. The well water is clear to the unaided eye. b. The sediment thickness remaining within the well is less than 5% of the screen length. 3. In addition to minimally removing 5 times the standing water volume in the well (to include the well screen and casing plus saturated annulus, assuming 30% porosity), the following apply: a. For those wells where the boring was made by the use of cable tool, auger, or air rotary methods and without the use of drilling fluid (mud and/or water), only the 5 volumes need be minimally removed. Should recharge be so slow that the required volume cannot be removed in 48 consecutive hours, or the water remain discolored, or excess sediment remain after the five volume removal; contact the Engineer. b. For those wells where the boring was made or enlarged (totally or partially) with the use of drilling fluid (mud and/or water), remove 5 times the measured amount of total fluids lost while drilling plus five times the standing water volume as above. The same procedure applies here as above with respect to slow recharge, discoloration, and sediment thickness. 4. Water shall not be added to a well as part of development once the initial seal is placed. However, when a bore, made with or without the use of drilling fluid, contains an excessively thick, particulate-laden fluid which would preclude or practically hinder contractual well installation, the contractor may purge or dilute this fluid with clean water from the approved source (also see III.C.6). A record of purging fluid losses shall be made on the log or diagram, and 5 times the volume of this loss shall be added to the other volumetric removal requirements for well development. 5. No dispersing agents, acids, disinfectants, or other additives shall be used during development or at any other time be introduced to the well. 6. Well development shall be completed at least four consecutive days before well sampling. 7. During development, water shall be removed throughout the entire water column by periodically lowering and raising the pump intake (or bailer stopping point). 8. For each well, a one-pint sample of the last water to be removed during development shall be obtained and kept onsite for visual inspection in an area where freezing will not occur.