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40 INVESTIGATIVE METHODS <br /> ODS <br /> The rationale for boring locations, sampling procedures, and laboratory chemical analyses are <br />' discussed below <br /> Ll Boring Location Rationale <br />' Caltrans designated the monitoring well and CPT boring locations and specified the sampling <br /> protocols <br /> 4 2 Soil Sampling Procedures <br />' Soil samples from the monitoring well boring were taken at 1 5-meter (5 feet) intervals using a <br /> 5 08-centimeter (2-inch)-diameter by 45 72-centimeter (18-inch)-long splitspoon sampler equipped <br /> with three 15 24-centimeter (6-inch)-long stainless steel sampling tubes The sampler was driven at <br />' 1 5-meter (5-ft) intervals, 45 72-centimeters (18 inches) into the underlying soil by a 64-kilogram <br /> (140-pound) hammer dropping 76 2 centimeters (30 inches) The number of blows required to <br /> advance the sampler each 15 24-centimeter (6-inch) increment was noted and recorded on the field- <br /> boring log The sample tubes were sealed with Teflon sheets and plastic end-caps, labeled, <br /> preserved in a cooler chilled with ice, and transported to Zymax under standard chain-of-custody <br />' procedures for chemical analyses The borings were logged following the Unified Soil <br /> Classification System(USCS) A boring log is presented in Appendix B <br /> Each sample was field logged using the USCS under the supervision of a California Registered <br />' Geologist The soils were field screened during drilling with a photo-ionization detector to obtain a <br /> preliminary indication of potential hydrocarbon impacts in the subsurface soils The headspace <br /> readings are presented on the boring log presented in Appendix B of this report <br />' 4.3 Groundwater Sampling <br /> Following well development, groundwater samples were collected from the well with a disposable <br /> bailer The collected water was decanted into appropriate sampling containers supplied by the <br /> analytical laboratory Each sample was labeled, chilled, and transported to Zymax utilizing <br />' standard chain-of-custody procedures <br /> Groundwater samples were obtained from the CPT borings at the target zones by setting a 1 5-meter <br /> (5 foot)-screen with the hydropunch and collecting groundwater with a small diameter bailer The <br />' groundwater samples were transferred to laboratory-provided sample containers, labeled, chilled, <br /> and transported to the analytical laboratory using standard chain-of-custody documentation <br /> Project No S8475-06-02 -8- December 26,2001 <br />