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4.0 EQUIPMENT LIST <br />The equipment necessary that may be used to measure water levels includes: <br />• Electric water level indicator capable of producing measurements to a precision of <br />0.01 feet <br />• 5-gallon buckets or equivalent for decontamination <br />• Brushes for decontamination <br />• Field data sheets <br />• Field notebook <br />• Chemical-free paper towels or Kimwipes <br />• Alconox soap <br />• Potable water <br />• Garden-type sprayer filled with deionized or distilled water <br />• Appropriate health and safety equipment <br />5.0 PROCEDURES <br />5.1 DISCUSSION <br />Generally, water elevation measurements are used to construct potentiometric surface maps. <br />Therefore, water level measurements at a given site should be collected within a 24-hour <br />period. The device used to measure water levels should be adequate to attain an accuracy of <br />0.01 feet. Water levels should be allowed to stabilize for a minimum of 48 hours after well <br />construction and development before measurements are taken. <br />5.2 MEASUREMENT PROCEDURE <br />This section gives the steps to follow when measuring water levels. Note that appropriate <br />health and safety equipment should be worn during well opening, well measurement, and <br />decontamination. <br />Before any measurement is taken, the water level probe shall be decontaminated. <br />Decontamination procedures are discussed in SOP No. 10.0. <br />Make sure the monitoring well is labeled and the location ID is visible on the protective <br />casing. <br />After opening the well cover, measure the depth of the static water level and the total <br />depth of the well using an electric water level indicator. The measuring point for all the <br />wells shall be the top of PVC or steel well casing. The measuring point will be marked <br />by a notch or other mark in the PVC or steel casing. If no mark is present, measure from <br />the top of the north side of the casing. <br />Powertech <br />Rev. SOP 6-IJAB <br />4/23/2007 <br />R Squared Inc <br />E'' <br />Attachment A