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Well Data Sheet Instructions (Rev. 11/99) Page 6 <br /> Effective Porosity: Effective porosity is used to estimate the volume of water that can <br /> be pulled from the pore spaces of the aquifer. Effective porosity is <br /> entered in decimal percent(no units). If the effective porosity is not <br /> known the field can be left blank or you may enter"Unknown". <br /> See notes at end of this guidance for additional information. <br /> Confining layer(impervious strata) This field is intended to identify is there is a confirmed confining <br /> above aquifer? (impervious) layer above the aquifer from which the well draws. It <br /> is not intended to be used for localized, small layers of less pervious <br /> material that are encountered during well drilling. Typically,the <br /> determination of a confining layer is made by a hydrogeologist or <br /> other expert and is described or documented in a report. Because a <br /> "Yes" answer results in a PBE determination that the source is very <br /> well protected from contamination, care should be taken in <br /> answering this question. <br /> Thickness of confining layer, if See above. If a report has been prepared that documents a <br /> known confining layer, the same report will generally describe the <br /> thickness and characteristics of the Iayer. <br /> Static Water Level Enter as feet below ground surface. This field is used as part of the <br /> PBE evaluation. Greater depths to ground water can mean more <br /> vertical travel time for contaminants at the surface to reach the <br /> water supply. Sometimes, DWR or a local water agency will have <br /> information on regional ground water depths_ This information <br /> may or may not be specific enough for an individual well. <br /> Typically the well drillers' log lists a depth to static water. Use this <br /> value with caution, because it may change over time. Ask the water <br /> system if measurements have been taken more recently. DWR has <br /> a website with some information on ground water depths. The <br /> address is: http://well.water.ca.goy <br /> Static water level measurement: If known, list the date (MonthNear)that the water level was taken. <br /> Date;Method Enter a semi-colon, then enter the method (if known)that was used <br /> to record the water level. Methods for measuring water level <br /> include: steel tape, light, acoustic sounder, airline, and electric <br /> pressure transducer. <br /> Pumping water level Enter as feet below ground surface. This is the level at which water <br /> stands in a well when pumping is in progress_ This may be <br /> estimated by adding the drawdown measured during well testing to <br /> the depth to static water. <br /> Pumping water level measurement: See above for static water level measurement. <br /> Date;Method <br /> WELL PRODUCTION <br /> Well yield Volume of water per unit of time that a well can reasonably be <br /> expected to produce. Enter in gallons per minute. This is not the <br /> same as the capacity of the pump! If this information is not <br /> accurately known, leave this field blank or enter `unknown'. <br /> Well yield based on Typically well yield is determined by a pump test. However, if <br /> another method is used list it in this field. <br /> Date measured Enter the date that well yield was measured as Month/Year. <br /> Is the well metered? Is there a production meter on the well before it enters the <br /> distribution system or treatment facility? <br /> Production Enter the typical production of the well in gallons per year. This <br />