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Wm. J. Hunter & Associates <br /> Registered Geologists 2220 Loma Vista Dr <br /> Petroleum& Mineral Appraisers Sacramento, CA 95825 <br /> (91 6) 972-7941 <br /> RE. BIDDING AND MINIMUM REQUIREMENTS FOR DEVELOPMENT,FAX (91 6) 972-1683 <br /> PURGING AND SAMPLING OF MONITORING WELLS <br /> The tasks required for each well are <br /> DEVELOPMENT: <br /> 1 ) Surge and pump well construction materials with a surge block and or stainless steel <br /> bailer Remove sufficient amount of material to clear well screen of construction <br /> material and remove all sediments from well casing to create a conduit for representative <br /> sampling. <br /> Pump or bail a minimum of five volumes from well to complete development <br /> 2 ) Containment of all purge and development water in D O T 17 drums <br /> 3 ) Sound the well for total depth. <br /> 4 ) Cap off and replace monument top <br /> 6 <br /> PURGING AND SAMPLING- <br /> 1 ) Clean off and open wellhead monument, secure area with appropriate traffic control <br /> 2 ) Initiate a detailed field monitoring log <br /> 3 ) Screen well head annulus for the presence of volatile aromatics with the use of a <br /> calibrated photoionization detector <br /> 4 ) Scan for the presence of free floating product with a product interface meter <br /> 5 ) Confirm depth to water and overall depth of each well (calculate standing water <br /> column) <br /> 5 ) Complete a 3-5 well volume purge with a 2" Grundfos stainless steel submersible or a <br /> environmental bladder purge pump. <br /> 7 ) Record the Ph, Conductivity, Color and Temperature of each volume to establish and <br /> confirm well development. <br /> 8 ) Contain all purge & decontamination water in D O.T. 17 steel drums <br /> 9 ) Bail and Sample each well with a teflon, stainless steel or disposable bailer <br /> (A bailer blank will be collected prior to sampling each well) <br />