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A S S O C I A T E S I N <br /> C <br /> 2-1 Drilling Activities <br /> ' On March 2 and 3, 1999, ATC personnel supervised advancement of three soil borings, SB9A, <br /> SB 10, and SB 11 to depths ranging from approximately 46 5 to 65 feet bgs Soil boring SB 10 <br /> ' was advanced on the east side of San Joaquin Street, east of the site, to a depth of 46 5 feet bgs to <br /> evaluate the horizontal extent of petroleum hydrocarbon impacted soil and groundwater Soil <br /> borings SB9A and SB 11 were advanced to 46 5 feet bgs and 65 feet bgs, respectively on site to <br /> 1 evaluate the horizontal and vertical extent of petroleum hydrocarbon impacted soil and <br /> groundwater The boring locations are shown on Figure 2 <br /> 1 The original scope of work called for boring SB9A to be advanced to 90 feet bgs using <br /> continuous core methodologies to define the vertical extent of impacted groundwater and soil <br /> 1 and obtain precise lrthological data The boring was advanced to 60 feet bgs when an extremely <br /> hard clay layer was encountered At 60 feet bgs, soil cuttings from the hollow-stem auger began <br /> 1 to obstruct the core barrel of the continuous core sampler The core barrel was removed which <br /> required the augers to be removed from the boring The boring was drilled out and another <br /> attempt was made to advance the continuous core sampler and the augers Soil cuttings again <br /> obstructed the core barrel of the continuous core sampler The boring was terminated at 65 feet <br /> bgs <br /> 2.2 Soil Boring Advancement and Samplin>� <br /> 1 Drilling was conducted by V & W Drilling (State C57 license no 720904) utilizing a hollow <br /> stem auger drill rig A field geologist logged drill cuttings and soil samples utilizing the Unified <br /> Soil Classification System Descriptions of soil types encountered and sample collection <br /> intervals are included on the boring logs contained in Appendix A <br /> ' Soil boring S139A was advanced using continuous core methodologies to collect undisturbed soil <br /> samples and obtain more exact lrthological data The soil samples from borings SB10 and SB11 <br /> ' were collected at five-foot intervals using a 2-inch diameter split-spoon sampler containing three <br /> brass tubes The soil samples and drill cuttings were characterized for soil type, moisture <br /> content, and visual evidence of petroleum hydrocarbons A flame ionization detection meter <br /> 1 (FID) was used as a field screening device for the detection of petroleum hydrocarbon vapors in <br /> drill cuttings and cored samples Following the collection of samples, each boring was pressure <br /> grouted to the surface Drill cuttings were temporarily stored on site in 55-gallon DOT approved <br /> steel drums <br /> w 1625961reportslphiu doe 3 <br />