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Farmington Groundwater Recharge Program STC Work Plan—Hammer Site <br /> 2.5.4. Pond Height <br /> A staff gauge will be installed at the site to monitor the depth of ponded water. Regulation of <br /> inflows and outflows will be based on staff gauge readings in order to maintain a constant head. <br /> If flooded field ground water recharge technique is implemented, water depth will be maintained <br /> between 0.5 and 1.5 feet. If an excavated pit recharge technique is implemented, water depth <br /> will be maintained between 1.0 and 5.0 feet. To achieve that depth, manual readings from staff <br /> gauges will be recorded according to the schedule in Appendix D and on the forms provided in <br /> Appendix G and changes in inflow and outflow will be made if necessary. <br /> 2.5.5. Inflow Rate <br /> Inflow rates necessary for pilot recharge testing will be estimated after analysis of data from the <br /> first data collection stage. Calculations will assume that the site is supplied by a constant flow <br /> rate for 24 hours a day and that pond height must be maintained at the specified height. Careful <br /> records of inflow and outflow rates, collected according to the schedule in Appendix D, will be <br /> kept to help determine final infiltration rates. <br /> A water balance will be used to derive the infiltration rate during direct pilot recharge testing. <br /> I = {[(V2-V 1)/A]—(S2-S1) +P—E}/T <br /> Where: <br /> I = Infiltration rate(feet/day) <br /> V2 =Current flow volume reading(ft) <br /> V 1 =Previous flow volume reading (ft) <br /> A=Area of pilot test site in square feet(ft) <br /> S2 =Current depth of water in test site (feet) <br /> S 1 =Previous depth of water in test site(feet) <br /> P= Precipitation(feet) <br /> E=Evaporation(feet) <br /> T=Time (days) <br /> 2.5.6. Site Maintenance and Monitoring <br /> Equipment <br /> MWH and SEWD will monitor and maintain all equipment at the site. This includes the water <br /> conveyance pipeline, flow regulation device, water volume meter (automated dataloggers), and <br /> any safety features such as fencing that may be needed at the site. Potential problems may affect <br /> performance, such as berm erosion, turbid water, and algae formation. MWH will assist SEWD <br /> with the monitoring and data collection process during pilot recharge testing. <br /> MWH 2-15 July 2004 <br />