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ENVIRONMENTAL SCIENCE AND ENGINEERING, INC. <br /> M E M 0 R A N D U M . . . . . . . . . • . . . • • . . February 25, 1988 <br /> TO: Heidi Hubbard <br /> FROM: Bob Momberger <br /> SUBJECT: Work Plan for March 2, 1988, Monitor Well Installation, <br /> Development, and Sampling <br /> Monitor Well Instal ation <br /> ESE has been authorized by the U.S. Army Toxic and Hazardous Materials <br /> Agency (USATHAMA) to install Monitor Well 402CD at Sharpe Army Depot (see <br /> enclosed map for location) . All field activities will be carried out <br /> according to the USATHAMA Geotechnical Requirements Manual (May, 1987) <br /> with drill cuttings and purge water containment procedures being the same <br /> as during previous field efforts. Monitor Well 402CD will be installed <br /> to monitor the aquifer below Well 402C [which is screened from 97 to <br /> 107 feet (ft)] . The lithologic log of Well 402D indicates that the CD <br /> aquifer zone should be between 155 and 175 ft below land surface. <br /> A typical USATHAMA monitor well includes a 10-ft section of slotted <br /> polyvinyl chloride (PVC) pipe with solid PVC pipe installed to the <br /> surface. There will be a 15-ft filter pack region (i.e. , to 5 ft above <br /> the slotted PVC) with a 5 ft section of bentonite seal above the filter <br /> pack. The annular space will then be grouted to the surface in the <br /> presence of a San Joaquin Local Health District Official. <br /> Monitor Well Development and Sampling <br /> All USATHAMA geotechnical requirements will be followed during these <br /> activities. There is approximately a 48-hour waiting period after <br /> grouting a well before it can be developed and a 7-day stabilization <br /> period after development, before any well can be sampled. <br /> ,. C <br /> WRD2415.2/RJM-MEM0.1 <br /> 02/25/88 <br />