Laserfiche WebLink
Project 113-26, Page 3 <br /> II. Current Activities. <br /> 1. Procedures. <br /> Soil samples were collected on February 26, 1993, using a one-inch diameter <br /> continuous coring extractor. The stainless steel pipe, assembled in four foot sections, <br /> has a clear plastic sleeve insert placed in the foremost section. The pipe is driven <br /> into the ground using a roto-hammer When the pipe is driven four feet, the pipe <br /> and sleeve are extracted from the ground and the sleeve is removed from the pipe. <br /> Minute changes in lithology can be observed through the sleeve's clear plastic. <br /> Samples are selected from the sleeve by cutting a one-foot section The section is <br /> capped, taped, labeled, and placed on ice in a portable ice chest for transport to the <br /> laboratory (McCampbell). <br /> Water samples were collected by placing a screened well point on the end of quarter- <br /> inch FVC tube down the borehole. A hand vacuum pump was used to pump water <br /> out of the hole and into a plastic container. The water was then transferred into a <br /> 40-m1 VOA (volatile organic analysis), labeled, and placed on ice in a portable ice <br /> chest for transport to the laboratory (McCampbell). Two VOA's were filled for each <br /> sample <br /> Fight soil samples and six water samples were obtained from these borings. Chain of <br /> Custody forms accompanied the samples to the laboratory. Soil samples were <br /> inspected for lithologic classification in accordance with the Unified Soil <br /> Classification System (USCS). <br /> On March 2, 1993, water levels were again measured for all four monitoring wells. <br /> The skimmer in MW-4 was removed and checked. It was dry inside. The bottom <br />' valve was closed, the vent tube was unclogged It was replaced at a slightly greater <br /> depth, based on water level measurement <br /> 2. Results <br /> Soil Logs. <br /> Bore logs for the seven boreholes are in the Appendix, along with a copy of the <br /> USCS classification system and a site map showing locations of the boreholes The <br />' first ten feet of soil consisted mainly of layers of silty and sandy clays, some clayey <br /> sands, and some fine- to medium-grained sands. <br /> Water level measurements. <br /> Well data from March 2, 1993, are listed in Table 1. The flow direction is to the <br /> southeast, with a gradient of about 0 0015. <br /> 21 <br /> Parker Environmental Services 4185 Rialto Court Pittsburg CA 94565-6116 <br />' Phone (510) 439-1024 Fax (510) 439-2566 <br />