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GROUNDWATER TECHNOLOGY <br /> STANDARD OPERATING PROCEDURE <br /> CONCERNING MONITORING WELL INSTALLATION <br /> SOP 13 <br /> The boreholes for the monitoring wells shall be drilled <br /> using a truck mounted hollow stem auger drill rig. The <br /> s Outside diameter (O.D. ) of the auger should be a minimum <br /> Of eight inches when installing 4-inch well screen. The <br /> hollow stem auger provides minimal interuption of drill- <br /> soil hile <br /> sampliat ng <br /> a tdspecific intervals. <br /> a conventional split barrel sampler containinths g hammering <br /> 2 inch brass sample tubes. 9 precleaned <br /> The construction details of the monitoring wells to be <br /> drilled at the site are graphically depicted in the <br /> attached figure titled "Typical Detail of Monitoring Well <br /> Construction" (See Figure 1). The wells should be cons- <br /> tructed of 4 inch PVC, .ata inch machine slotted screen <br /> and blank casing. The screened portion of the well will <br /> extend 5 feet above and 10 feet below the present water <br /> table. An appropriate sand pack as determined by grin <br /> size analysis shall be placed in the annular space between <br /> the casing and drilled hole to inhibit silt buildup around <br /> the well. An annular seal installed above the sand pack <br /> should consist of bentonite pellets overlain by neat <br /> cement or cement grout to the surface. The wellhead shall <br /> ✓ be protected below grade within a traffic rated street box. <br /> plate containing the following information <br /> Each well shall have a permanently attached identification <br /> (z) Wellhead Elevation, (1) 'dell Number, <br /> Interval. (3) Depth of Well, (4) Screened <br /> Subsequent to installation the wells shall be developed <br /> to remove silts and improve well performance. <br /> development shall be The well <br /> conducted by air lifting the water <br /> within the well until groundwater pumped from the wells <br /> is silt free. <br /> _ To assure that cross contamination does not occur between <br /> the drilling and development of successive wells all <br /> equipment contacting subsurface soils or ground water <br /> shall be steam cleaned. The steam cleaned equipment <br /> should include but not limited to the following (1) Dr�l- <br /> ling Augers, (2) Split Barrel Sampler, (3) �xoundw) D <br /> Monitoring and ater <br /> Sampling Equipment, (4) Well Development <br /> Piping and Sparging Equipment. <br /> � <br /> m" I TECHNOLOGY,INC. <br /> GROUNDWATER <br /> CONSUL rING GROUNDWATER GEOLOGISTS <br /> 16 <br />