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ARCADIS Ms. Kathy Amaru <br /> October 19, 2010 <br /> Temporary Well Point Installation Activities <br /> On August 26, 2010, Fisch Environmental (Fisch)of Valley Springs, California, under <br /> the supervision of ARCADIS, advanced one soil boring north of the site excavations <br /> which was converted into a temporary well point(TW-01). <br /> The temporary well point location was cleared to a depth of 5 feet bgs with a hand <br /> auger prior to drilling. Once cleared, the temporary well point was then installed using <br /> a direct push drill rig equipped with 4-foot acetate liners. Continuous soil samples <br /> were collected during drilling, and each soil sample was logged for stratigraphic <br /> characteristics using the Unified Soil Classification System and field screened for the <br /> presence of volatile organic compounds using a PID. <br /> Subsurface materials encountered generally consisted of poorly-graded sands. Wet <br /> formation materials, indicating groundwater levels, were observed at 12 feet bgs in <br /> soil boring TW-01 during installation activities. The boring log illustrating sampling <br /> intervals and stratigraphic descriptions for the boring is included in Appendix A. <br /> The temporary well point was installed to a total depth of approximately four feet <br /> below encountered groundwater(12 feet bgs)for the purpose of intersecting the <br /> groundwater table in the screened interval. The temporary well point was installed <br /> using pre-packed well materials consisting of five feet of 1-inch diameter PVC screen <br /> with 0.010-inch slotting and surrounding pre-packed sand. The pre-packed screen <br /> and riser was inserted into the borehole, and the water level inside the screen was <br /> allowed to equilibrate. <br /> Temporary Well Point Sampling <br /> Before sampling, the temporary well point was purged at a rate of approximately 300 <br /> milliliters per minute (mL/min) using a peristaltic pump until field parameters <br /> stabilized. After purging activities were complete, a groundwater sample was <br /> collected through the pump into laboratory provided sample containers. The sample <br /> was stored on ice in coolers and transported to Calscience under proper chain of <br /> custody procedures. The groundwater samples were analyzed for the following: <br /> • TPH as gasoline by USEPA Method 8015B(M) <br /> • TPH as diesel by USEPA Method 8015B(M) <br /> Page: <br /> 0111012775 da 8/12 <br />