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<br />Olllli3 <br /> <br />e <br /> <br />. <br /> <br />. <br /> <br />Water diverted from the diversion channel passes over a rectangular, broad-crest weir and <br />into a large sedimentation pond. The weir is provided with a continuous flow meter and is <br />similar to that at site 1. There are two injection wells, each with an intake manifold of <br />perforated pipe. Each pipe is laid on a 2-foot-thick bed of coarse washed gravel and <br />covered with a 2-foot layer of washed gravel. The perforated line is connected to the <br />injection well via a short length of steel pipe, which is connected directly to the well casing. <br /> <br />The east injection well was completed to a depth of 74 feet (sediments from 0-38 feet and <br />limestone from 38-74 feet). The west injection well was completed to a depth of 69 feet <br />(sediments from 0-46 feet and limestone from 46-69 feet). Each of the injection wells <br />required a casing to about 50 feet below the land surface. The observation well was <br />completed to a depth of 659 feet (sediments from 0-80 feet and limestone from 80-659 feet). <br />No additional rehabilitation was required for this well. <br /> <br />Site 3 - Coiner Ranch.-Dry Creek, the water supply, is an intermittent stream flowing from <br />the hills to the south. Dry Creek is used for irrigation and stock watering and is fully <br />appropriated during the irrigation season. <br /> <br />Water is diverted into an existing irrigation conveyance from Dry Creek to Coiner Ranch <br />where two existing wells were converted for injection use. Conveyance facilities consist of <br />an open channel, a diversion structure from the channel to a sedimentation pond, a <br />diversion structure to the injection wells, piping to the wells, and the injection wells. <br /> <br />Drop pipes were installed in each well to a depth of 250 feet. This is just above the bottom <br />of the well. The drop pipe installed in various project injection wells proved to be very <br />effective in preventing excessive air entrainment and subsequent air locking during <br />groundwater recharge. They also prevent damage to the well bore in uncased areas of <br />questionable stability. Finally, the drop pipe acts as a siphon to increase the capacity of the <br />delivery system. <br /> <br />The first injection well was completed to a depth of 258 feet (sediments from 0-156 feet; <br />basalt from 156-167 feet; sediments from 167-190 feet; basalt from 190-205 feet; sediments <br />from 205-224 feet; basalt from 224-241 feet; and limestone from 241-258 feet). The second <br />injection well is completed to a depth of 257 feet (sediments from 0-34 feet; basalt from <br />34-118 feet; sediments from 118-135 feet; basalt from 135-140 feet; sediments from 140-162 <br />feet; basalt from 162-206 feet; sediments from 206-240 feet; limestone from 240-259 feet). <br />The observation well is completed to a depth of 274 feet (sediments from 0-26 feet; basalt <br />from 26-58 feet; sediments from 58-130 feet; limestone from 130-274 feet). The casing for the <br />three wells is steel to 160, 118, and 130 feet, with the lower portion left without casing. <br /> <br />Site 4 - Myers' Ranch.-Water is diverted from Dry Creek, the water supply, through an <br />existing ditch and pipe system over a short distance to the groundwater recharge site. After <br />being diverted from the creek, water flows through a turbulent fountain to screen out <br />debris. <br /> <br />An existing well at this site was rehabilitated for injection recharge operations. The existing <br />well was cleaned out and deepened to provide an injection well with a total maximum <br />depth of 750 feet. The receiving aquifer at this site is composed of a rhyolite rock formation. <br /> <br />5 <br />