Laserfiche WebLink
1 <br /> Mr. Ron Rowe <br /> Page 2 <br /> S e of Work <br /> The workscope consisted of drilling soil borings in the former tank pit area and collecting soil <br /> and groundwater samples for laboratory analysis. Field work was conducted on January 14, <br /> 1998. <br /> The drilling was performed by Fisch Environmental (C57 683865) using a direct push rig. The <br /> workplan originally stated that one boring would be advanced to groundwater through the eastern <br /> end of the former tank pit with continuous coring to total depth.` However, during this initial <br /> attempt, pea gravel backfill continued to fill the borehole and prevented continuous soil <br /> sampling. Therefore, the boring was terminated and backfilled with neat cement and bentonite. <br /> Soil boring SBI was advanced immediately east (2-3 feet) of the former tank pit to a depth of <br /> 28 feet below ground surface (bgs). The soil at this location was logged continuously. Soil <br /> borings SB2 and SB3 were located south and north, respectively, of the eastern end of the <br /> former tank pit, and were advanced to depths of 21 feet bgs. Soil boring SB4, located within <br /> the former tank pit and adjacent to the terminated boring, was advanced to collect a sample of <br /> native soil beneath the tank pit backfill. Groundwater was encountered at depths from 17 to 19 <br /> feet bgs. Boring locations are shown on Figure 2. <br /> All drilling and sampling equipment was washed prior to use io avoid cross contamination. <br /> Rinsate water generated by cleaning was collected in an appropriately labelled 55-gallon drum <br /> and temporarily stored onsite. All borings were backfilled with neat cement to ground surface. <br /> All field and laboratory activities performed at the site were conducted in accordance with the <br /> Quality Assurance/Quality Control Plan and the Health and Safety;Plan included in the Workplan <br /> (Ground Zero, December 16, 1997). <br /> Site Litholoav <br /> Based on continuously logged boring SB1, the soil beneath the site consists primarily of silt and <br /> lean clay to 28 feet bgs, the maximum depth explored, with a minor silty sand lens from about <br /> 6.5 to 7 feet bgs and a sand layer with silt and gravels from 16rto approximately 18 feet bgs. <br /> There was no sample recovery from 14 to 16 feet. Groundwater was first encountered at a <br /> depth of 17 feet bgs. <br /> In borings SB2 and SB3, soil samples were collected every five?feet for logging and analytical <br /> purposes. Soils in borings SB2 and SB3 consisted of silt to a depths of approximately 18 and <br /> 20 feet bgs, respectively, underlain by silt with sand and ,;.sand with 'silt, respectively. <br /> Groundwater was encountered in borings SB2 and SB3 at approximately 19 feet bgs. Silt was <br />