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I The sand content test shall consist of a 'od of 4 hours of contin <br /> pen uoas pumpmg at a discharge <br /> ' of 40 gpm or may be part of the test pumping procednre described below. F1ow rates shall be <br /> measure�with a circular orifice meter or other method approved by the Engineer. Sand content <br /> measurements shall be taken at 15 minute int�rvaLs a as dire�ted by the Engineer. The discharge <br /> � will be considered acceptable if the aveaage sand concentration measured in the five samples is <br /> less than 1 part per million and the consecudve samples have shown a trend toward decreasing <br /> or stable sand content valnes. <br /> � Sand content samples shall be collecte� ss described in Appendix D of the AWWA A100 <br /> Standard for Water Wells using a centrUugal sand sampler located on a tap at the discharge <br /> � pipe centzrline. At kast SO gallons of water shall be collected using this method. The <br /> centrifugal sand sampler shall be provided by the Conttactor along with a drum or other vessel <br /> for measuring the discharge volume. The centrifuge shall collect the sand in a removable tube <br /> � for dirxt measurements of sand volume. <br /> 3.3.6 Test Pumoinrt <br /> � Upon completion of well development,the Contractor shall clean out the well w the bottom of <br /> � the screen and install tempotary pamping equipment, throtding valves and suitable measuring <br /> devices approved by the Engincer,capable of producing and measuring a flow of 100 gpm and <br /> of sunultaneoosly measiuing the drawdown at the production well. Water pumped during test <br /> ' pumping shall be discharged at a location designated by the Owne�s Representative. The <br /> Contractor shall assist the Engineer in placing insuumentation up to 1.0-inct�s in diameter in the <br /> well to depths up to 100 fcet below static wat� level. The test shall be conducted at such <br /> � vario�s rates of flow as the Engineer may direct, and the Contractor shall accurately measure <br /> drawdown and discharge rates at such intervals as directed by the Engineer. The Contractor shall <br /> also record sand content of the piunped water at stable drawdowns at each pumping rate. It is <br /> � andcipaced that the test will be performed for an 8-ho�r pe.riod of continuous operation,but the <br /> Enginoer reserves the right to lengthen or shorten this pe,riod as may be indicate�by the results. <br /> If,at the completion of the test,the Enginea shall det�ecmine that the test is not sufficient,he may <br /> ' direct the C�tractor to remove the test pump and equipment and proceed further with <br /> �velopment and again direct another test be made. <br /> � 3.3.7 Well Abandonment <br /> ff the well fails to confam to these spe�ifications and the Contiactor is unable to comect the <br /> � condidon or negodate a mutually acceptable cost reducdon for specific deviadons, it shall be <br /> considered an abandoned hole,and the Contractor shall immediately start a new well at a nearby <br /> ' location designated by the Owner. <br /> The abandoned well shall be sealed in accordance'vaith the Minnesota Department of Health <br /> � Water Well Construction Code. <br /> � <br /> ' TS-3-7 <br /> ' <br />