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(Modified) and 8020 Portions of each samples were extruded into zip-lock <br /> plastic bags for field headspace measurement of volatile organic compounds <br /> with an HNu, photoionization detection meter <br /> Monitor Well Construction <br /> Monitor well MW-1 was constructed through the 11 7/8-inch hollow stem <br /> augers using 4-inch inside diameter (I D ) , Schedule 40 PVC, 0 02-inch <br /> slotted well screen from 12 feet to 34 feet and 4-inch I D Schedule 40 <br /> PVC well casing from 12 feet to approximately six inches below ground <br /> surface As previously mentioned, the bottom seven feet of the monitor <br /> well MW-1 borehole was backfilled with bentonite pellets prior to well <br /> construction Monitor wells-MW-2 through -10 were constructed through the <br /> 6 5/8-inch hollow stem augers using 2-inch I D , Schedule 40, PVC 0 02- <br /> inch slotted well screen and 2-inch I D Schedule 40 PVC well casing <br /> Monitor wells MW-2 through -10 were all over-drilled from 5 to 15 feet <br /> past the bottom of the screened interval to provide lithologic information <br /> at depth In each case, the over-drilled portions of the boreholes were <br /> backfilled with sodium bentonite pellets prior to well construction <br /> Screened intervals and borehole total depths for the monitor wells are as <br /> 4 follows <br /> Screened Interval Total Depth <br /> IMW- 1 12 ' - 34' 41' <br /> MW- 2 12' - 34' 41' <br /> MW- 3 12' - 34' 41' <br /> MW- 4 12' - 24 5' 30' <br /> MW- 5 12 ' - 26 5 40' <br /> MW- 6 12 ' - 28' 40' <br /> MW- 7 12' - 30' 40' <br /> MW- 8 12' - 28' 40' <br /> MW- 9 12' - 24' 29' <br /> MW-10 12 ' - 25' 30' <br /> The annular space between the borehole wall and well screen in each boring <br /> was filled from the bottom of the screen to 11 feet below ground surface <br /> with Clementina #3 filter sand A bentonite pellet seal was installed in <br /> each well from 11 to 9 feet below ground surface, and a neat grout mixture <br /> of 94 pounds of Portland Type II cement and six gallons of clean, potable <br /> water was placed in each well from a depth of nine feet to ground surface <br /> A PVC slip cap was placed on the top of each well casing Well heads <br /> consisted of water-tight, locking, traffic rated, monitor well vault boxes <br /> with a four inch wide cement pad to grade <br /> Each monitor well was developed immediately after the bentonite seal was <br /> installed and properly hydrated Monitor wells MW-1 through -8 were <br /> developed with a five horsepower centrifugal pump Monitor wells MW-9 and <br /> -10 are relatively low-yielding and were developed with a 1 1/2-inch x 3- <br /> foot, stainless steel bailer Approximately 110-gallons of water was <br /> 11 <br />