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e to . • <br /> I � <br /> CLEARWATER <br /> G R Q U P, I N C. <br /> CONSTANT DISCHARGE AQUIFER TEST <br /> FIELD PROCEDURES AND PROTOCOLS <br /> PURPOSE AND SCOPE . <br /> IAquifer 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 /> EQUIPMENT SET-UP AND SITE CONTROL <br /> Prior to arriving on site, Clearwater Group, Inc. (CGI) will obtain the. <br /> I 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 submersibleP Pum , either a 1/3.hp. Grundfos or a mini 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 is 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 silt. 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 in 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 /> I . <br /> Constant-Discharge Aquifer'Test Page 1 of 5 December 16,1994 <br />