WORK PLANS - Laserfiche WebLink

Home Browse Search

Jim Tjosvold Page 2 July 3 , 1987 wire line recovery. The cores/samples must be adequately logged, properly labeled, and stored in boxes designed to hold samples and be in locations conducive to their preservation. All locations, including those which have been continuously cored, need to be geophysically logged. The geophysical logs also must include spontaneous potential, resistivity (point, short and long normal) , and caliper data. Continuously cored (mud rotary/wire line) samples provide superior geologic information which we believe may result in an overall lower cost for site characterization and remediation. However, we are also willing to accept detailed lithologic logs prepared lasing dual tube percussion. If dual tube percussion drilling is used, it is recommended that for wells 6-C and OS-4C groundwater be sampled at depths above and below major changes in permeability as observed from soil cuttings. This may require groundwater sampling from more than the five zones defined to date. The purpose of this depth sampling is to provide a more detailed profile of groundwater contamination at the site. Well Locations 7 . The workplan has provided for wells in all locations agreed upon between the State and McCormick and Baxter. However, to better define both the contamination plume and groundwater gradients, "A" and "D" zone wells should be included at location OS-1 and a "D" zone well at location OS-4 . As discussed, piezometers may be used to collect water level data, with the understanding that wells may be required at a later date for water quality sampling. Water Level Monitoring 8 . McCormick and Baxter are to review existing surface and groundwater data to confirm the interconnection of Mormon Slough with the "A" zone. If the existing data is not conclusive, water levels in Mormon Slough should be monitored in conjunction with water levels in monitoring wells. Slough water levels should be monitored frequently at first (in short time intervals or continuously) to establish the degree of fluctuation, eventually adjusting the monitoring to the same time scheduling as the monitoring wells. 9 . We must resolve the concern that groundwater contamina'�ion has migrated to the north beyond the site's boundary. M-.-C"ormick and Baxter should describe their ...,;, :».,. ,...:..e,3,.rsYi�'..e�.w;a:,-," C`�'�u'�kekrr '.�tlmr:.'K7. i,7f!�a2iYr'-�- .-..,-,..araf,--•-,,rr--'x-.z,.-. .:. ._ .. ._.._..