Laserfiche WebLink
J. H. KLEINFELDER & ASSOCIATES <br /> ' 3 METHODOLOGY <br /> ' 3.1 DRILLING OF SOIL BORINGS <br /> Three soil borings will be drilled at locations designated by the DOHS and <br /> RWQCB, see Plate 2. The actual locations may be adjusted in the field <br /> depending on surface and subsurface obstructions. The purpose of these <br /> ' borings is to collect soil samples for chemical and physical analyses and <br /> obtain continuous lithology of the vadose zone. <br /> 1 The soil borings will be drilled using a truck.—mounted drill rig equipped <br /> with 8—inch hollow stem augers. During drilling, an experienced <br /> environmental geologist will classify the subsurface soils, collect and <br /> preserve samples, and log the boreholes. The Unified Soil Classification <br /> ' System (USCS) will be the basis for soil type classification. Two of the <br /> borings will be completed by backfilling to grade with a cement/bentonite <br /> grout emplaced with a tremie system. The third boring will be advanced <br /> beyond the water table and completed as a monitoring well. <br /> ' To minimize cross—contamination, all augers and associates equipment will <br /> be steam cleaned prior to the drilling of each borehole. The sampling <br /> equipment will be cleaned with a trisodium phosphate wash and a distilled <br /> ' water rinse prior to the collection of each soil sample. <br /> 3 <br /> 51-87-413 3 <br />