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Work Plan for Environmental Investigation May 18 , 1989 <br /> Proposed ARCO Station Woodbridge, California AGS 39044-1W <br /> fir <br /> ground-water monitoring wells, will be drilled-to approximately <br /> 15 feet below the uppermost zone of saturation. <br /> During drilling, soil samples will be collected from existing <br /> grade to the total depth of the boring at 5-foot intervals or <br /> obvious changes in sediments. Soil samples will be collected : for <br /> possible chemical analysis using a California-modified, split- <br /> spoon sampler equipped with cleaned brass sleeves. Samples will <br />(• be collected by advancing the auger to a point immediately above <br /> the sampling depth and driving the sampler through the auger, into <br /> the native soil. The sampler will be driven 18 inches or to: <br />�+ refusal with a standard 140-pound hammer repeatedly dropped 30 <br /> inches. The number of blows required to drive the sampler each <br /> successive 6-inch interval will be counted and recorded to give <br /> ir► an indication of soil consistency. Sampling refusal will be <br /> defined as more than 50 blows for a 6-inch interval . Examples of <br /> a Field Boring Log and Log of Boring Plate used in our report are <br /> r included in the Appendix to this Work Plan <br /> A representative sample from each sample interval will be tested <br /> 1, with a photoionizing organic vapor meter (OVM) . The OVM is <br /> useful for evaluation of relative concentrations of volatile: ! <br /> hydrocarbons but cannot be used to measure levels of <br /> E.i <br /> 11 <br />`� APPI ed GeoSYWOMs <br />