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casing. After cement pouring, the lowest stage in the annulus will be allowed <br /> to harden for a minimum of 24 hours prior to well development. <br /> Following completion, the wells will be developed by using a vented surge <br /> block until the discharge water is free of sand, and the water temperature, <br /> conductivity, and pH have stabilized. An air lifting and surging technique <br /> will be favored to loosen and clean out fine material. The field geologist will <br /> determine the exact duration of development at each well site. <br /> The top of the casing will be covered with a well seal plate. This plate will <br /> contain a one-inch access port for taking water measurements in addition to a <br /> small vent hole that will allow the well to respond to barometric changes and <br /> to water table fluctuations. A permanent, lockable, inverted steel box or large <br /> diameter locking steel casing will cover each well head to prevent tampering <br /> with the well. Due to the location of these wells in areas that are accessible to <br /> vehicular traffic, each will have barrier posts to prevent accidental damage to <br /> the well heads. <br /> 4.1.4 Well Location and Elevation Survey <br /> Each new and existing well head will be surveyed for its California <br /> coordinates to within one foot accuracy as well as its vertical elevation to <br /> within 0.01 foot accuracy. Also, existing staff gauges located at various <br /> Z:TROP-PRA199911524-p\d,IiAk\rpl-1524-I.da <br /> 12 <br />