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It. Beacon Station No 641 dune 15 2000 <br /> Stockton California Results of Additional Subsurface Investâ–ºgation <br /> J The remedial investigation consisted of the drilling of soil boring B3, and drilling and <br /> installation of monitoring wells MW-6, MW-7 and MW-8 at the locations shown on Figure 2 <br /> The installation of the soil borings and groundwater monitoring wells was completed on <br /> October 27 and 28, 2000 Horizon Environmental Inc Field Methods and Procedures are <br /> contained in Appendix. B BonnglWell Completion Logs and Boring Log Symbol Key are <br /> contained in Appendix C <br /> Soil boring B3 was located north of the western dispenser island area to evaluate the vertical <br /> and lateral delineation of petroleum hydrocarbons detected in soil borings B-1 (vapor wells <br /> VW-3 and VW-4) and soil boring B-2 (monitoring well MW-1) The three monitoring wells <br /> were located south (monitoring well MW-6), east (monitoring well MW-7) and north <br /> (monitoring well MW-8) of the UST basin to evaluate the lateral extent of gasoline <br /> constituents in groundwater A fourth monitoring well was proposed off site to the west of <br /> the UST basin but permission to install the well was not granted by the property owner <br /> The wells were drilled and installed by V & W Drilling Inc of Isleton, California using a <br /> hollow-stem auger rig fitted with 8-inch diameter, continuous flight augers Soil cuttings <br /> were stockpiled on and covered with plastic sheet Soil samples were generally collected at <br /> 5-foot intervals using an 18-inch long by 2-inch diameter split-spoon sampler <br /> The sediments were described using the Unified Soil Classification System (USCS) The <br /> USCS classifications are given on the Boring Log Symbol Key contained in Appendix C <br /> Sediments encountered in the borings consisted of interbedded yellow brown and olive brown <br /> sandy silt and silty sand <br /> Soil samples were field screened with a Thermo Environmental Instruments Inc organic <br /> vapor meter (OVM) to detect and quantify volatile organic compounds using photo- <br /> ionization detector (PID) technology Soil samples to be screened were placed in a plastic <br /> bag and sealed to allow any volatile compounds to equilibrate with the headspace The OVM <br /> 641AddSbsrfc1vest5-00 doc 4 HORIZON ENVIRONMENTAL INC. <br /> 164114 <br />