1600 MADISON ST 2016-01-01 MF Import

. The filter pack for the well consisted of clean, 10/20 Colorado Silica Sand. + The aunular seal of the well consisted of granulated Wyoming Bentenite. . pll PVC casing materials were steam-cleaned before installation. . The bottom of the well casing was sealed with a threaded sediment cup. Blank (non-slotte3) riser casing was used to exter3'he well from the top of the screened interval to ground surface. The length of the screened interval is ider.tified on the boring logs. . Well construction was accomplished by lowering the casing, into the completed boring, through the inside of the hollow-stem augers. The augers were withdrawn from :he boring about three feet, and the resulting annular space arouud the well screen wos backfilled with sand (poured through the top of the hollow-stem augers).'I'his process was repeated until the fiiter paak was installed to about two feet above the top of the screened interval. The augers were completely withdrawn from the boring, and the annul�r saace around the blank riser was backfi�led with granulated bentonite to within one fo�t of the ground surface. . The well casing was sealed at the ground surface with a watert:ght expansion cap or PVC slip cap. . A tamper-resistant steel cover was set over the well, flush to the ground surface. The cover was grouted in place with concrete. . A reierence point was marked on the top of the PVC well casing for consistent groundwater depth measurements. . The well identification was written on the well cap. Water Level Measurendents in We11s Water level measurements were referenced to tl�e iop of the well casie ��Tt r level robe level was measured in each monitoring ��veli using a conductivity typ , P (Solinst Model 101, Flat Tape Water Level Meter). The conductivity probe on the water level meter was lowered into the well until the instrument detected water. The tape connected to the probe was used to obtain a depeh-to- water measurement, from the reference po:at, :o within 0.01 feet. Monitoring Wcll Sampling, Bailcr Method A G-Logics employee sampled groundwater wells in accordance with the following protocol: 01-0105•C-AB.doc page B-1 of 8� CoPyriBht 2001 G•I.og�cs, Inc.