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CLEARWATER <br /> • G R O U P I N C <br /> CONSTANT DISCHARGE AQUIFER TEST <br /> FIELD PROCEDURES AND PROTOCOLS <br /> PURPOSE AND SCOPE <br /> Aquifer testing is generally required in order to accurately calculate aquifer <br /> hydraulic parameters such as hydraulic conductivity (K), transmissivity (T), <br /> and coefficient of storage (S) The remedial system can then be designed cost- <br /> effectively based on these calculated parameters In addition, the aquifer <br /> parameters are essential in evaluating contaminant transport The scope of <br /> the aquifer test will depend on the purpose of the proposed remedial system <br /> and the configuration of the site and contaminant plume In general, the <br /> constant-discharge aquifer test is the most accurate means for determining <br /> aquifer hydraulic parameters within the influence of a pumping well <br /> SET-U?AND S" CDN-73,01 <br /> Prior to arriving on site, Clearwater Group, Inc (CGI) will obtain the <br /> necessary permits to discharge all water extracted from the pumping well into <br /> the sewer, or a water holding tank to be delivered to the site for temporary <br />' storage <br /> CGI uses a submersible pump, either a 1/3 hp Grundfos or a mina Grundfos <br /> environmental pump A discharge hose is attached to the pump, and extends <br /> into either the sewer (if permitted) or a holding tank A flow meter is <br /> installed along the discharge hose to measure both flow rate and total gallons <br /> extracted If a recharge test as also going to be performed, a one-way check <br /> valve will be placed at the bottom of the discharge hose (less than one foot <br /> from connection to pump), to prevent water from pouring back down the <br /> well once the pump is turned off The pump is set approximately one to two <br /> feet from the bottom of the well to help keep the pump impellers from <br /> clogging with salt The pump is attached to a control box to regulate the flow <br />' rate A generator will be used to power the pump, as well as other equipment <br /> such as a light for night safety The generator will be placed an an area which <br /> will minimize noise disturbance to the surrounding neighborhood Pressure <br />' transducers will be used in both the pumping well and in the well closest to <br /> it. These will be connected to a data logger which displays the data as it is <br /> recorded The pressure transducer within the pumping well will be attached <br /> to the discharge hose, approximately one foot above the pump intake <br />' Constant-Discharge Aquifer Test Page 1 of 5 December 16,1994 <br />