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Hollow-Stem Auger Borings <br />' <br />' <br />Soil borings �vere drilled using a truck-mounted hollow-stem auger-drilling rig, provided by , <br />our drilling subcontractor. A G-Logics employee was present during the drilling and <br />assisted in obtaining samples of the subsurface materials, maintained a log of the borings, � <br />made detailed observations ofsite conditions, and provided technical assistance, as <br />required. <br />All drilling and sampling equipment was cfeaned be:ore mobilization and between borings � <br />to reduce the potential for cross contamination. In addition, the sampling equipment was ' <br />cleaned between each sampling interval before the collection of the next sample. <br />Auger Soil Sampling, Driven Sampler <br />Soil samples were collected by using a Modified California split-spooii sampler, which may <br />have contained'hree 6-inch-long brass liners (sample tubes) placed end-to-end. Sample <br />collection was attempted at five-foot depth intervals by driving the sampler approximately <br />18 inches with a 14�-pound hammer allowed to frec-fa1130 inches. The number of blows <br />required to drive the sampler each 6-inch interval was noted and recorded on the boring <br />logs. Soils were dassified according to the Unified Soil Classification System. <br />Ifused, one brass liner from each sampling depth was sealed with Teflon flm and glastic <br />cap. Altematively, the soil sample was removed from the sampler, placed directly into <br />laboratory-provided sample jars, and sealed with a Teflon lined lid. <br />The samples were then placed into an ice chest containing frozen "blue ice" for <br />preservation. The sample was then forwarded to the analytical laboratory using proper <br />Chain-of-Custody procedures. All soil sample contai�ers were labeled with sample <br />identification numbers, the date, and the sampler's name. <br />Gro�ndwater Monitoring Well Construction, Ho11ow-Stem Auger Methods <br />Soil borings were completed as groundwater monitoring wells in the folluwing manner: <br />• The well casing materials con,;isted ef 2-inch-diameter, flush-threaded, <br />schedule 40 PVC pipe. <br />• The screened interval of the well casing was perforated with 0.020-inch <br />factory-cut slots. <br />OI-0105•C•AB.da <br />Copynght 2001 GLogics, Inc. Page B•2 o:B-0 <br />