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k%j K L E IN F E L D E R <br /> B-3 2 Monitoring Well Develo merit <br /> 1 The wells are develop ed to reduce the effects of drilling on the formation and to increase the <br /> effective hydraulic tadius of the wells <br /> g developed 24 to 48 hours after installation to allow the rout to <br /> Monitoring wells ai c generally dc. ora g <br /> set Each well is first sampled with a clear disposable bailer to visually inspect for a hydrocarbon <br /> layer or sheen ll no product layer of sheen Is observed on the water, the well is developed by <br /> surging, pumping of bailing Suiging along the screened Interval of the well is performed to <br /> draw the sediment lion the formation into the filter pack and the well, and to set the sand pack <br /> Development continues until the discharge tuns relatively clear of fines Approximately 5 to 10 <br /> well volumes are geneia]ly removed Isom each monitoring well Discharge water is stored in 55- <br /> gallon drums and Ic.It on site for later dischaige or disposal by the client, depending on laboratory <br /> results The drums are labeled with the date, well numbei and a contact person and phone <br /> number <br /> B-3.3 Equipment Decontamination <br /> To reduce the potential for doss-containnunration between wells developing equipment is washed <br /> in a trisodium phosphate or non-phosphate detergent solution and rinsed in distilled water or <br /> steam cleaned ptiot to use in the next monitoring well <br /> B-3.4 Well Survev <br />' The locations of soil boiing,s and monitoring wells, and the elevation of the top of the PVC <br /> casings are usually surveyed and tied into permanent markers, if readily available Survey <br /> accuracy is 0 1 foot lot the "a" and "y" coordinates and 01 foot for the "z" coordinate The <br /> depth to static groundwater is measured horn a set location at the top of the PVC casing (usually <br /> the north rim) the depth of water is then subtracted from the elevation of the top of the well <br /> casing to provide a gioundwatei c,levation for each monitoring well location <br /> B-4 GROUNDWATER MONITORING <br /> B-4 1 Witter Level Measurements <br />' Water level measurements are made in the wells prior to purging and sampling the wells <br /> Measurement piotoc.ol is as follows <br /> 1 Prior to obtaining water level rmeasuiements, the monitoring wells would be opened and <br /> allowed to equilibrate foi a pet iod of approximately % hour <br /> 20-1108-24 L01/2019R 1 20 Page B-5 <br /> 01999,KleintOdtr, Ing February 5, 1999 <br />