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(P so <br /> on <br /> CON ASSOESCIATESOGq.ROVERS Mr.Mark Clardy <br /> February 22 2008 <br /> collected during excavation activities. A ma <br /> In Attachment A. P showing the TPHcrude concentrations is included <br /> ' In soil borings drilled <br /> M each borin within the extent of the <br /> g from the base ples will be collected <br /> Previous excavationsoil sam <br /> , <br /> of the previous excavati <br /> (fbg), and from 2 feet below the first soil sample, on at approximate] <br /> ' In soil borings drilled Y 9 feet below grade <br /> outside the previous excavation, soil samples will be collected from <br /> approximately 5 and 9 fbg. <br /> • Soil samples will be analyzed for TPHcrude. <br /> Work Tasks <br /> Permits:CRA will obtain any required drilling permits from SJCEHD. <br /> Site Safety Plan: CRA all prepare a comprehensive site-specific safety plan to protect site workers. 'The <br /> plan will be reviewed and signed by each site worker and kept on the site during field activities. <br /> y Utility Clearance: CRA will mark proposed drilling locationand s will clear the locations tough <br /> hr <br /> Jl Underground Service Alert prior to drilling. Granite indicated that borehole clearing using a private <br /> utility locator and air lmifing is not necessary because the area was previously excavated, and the area <br /> will be excavated again in the future to develop the site as a gravel quarry. <br /> Site Investigation: Assuming the absence of subsurface and overhead obstructions, CRA will use a <br /> hollow-stem auger drill rig to drill twenty-three soil borings at the approximate locations shown on <br /> Figure 2. The soil borings will be advanced to depths between 9.5 and 11.5 fbg, depending on <br /> encountered soils. Soil samples will be collected continuously from approximately 3 fbg for soil <br /> description and possible chemical analysis. In soil borings where fill-sand is encountered, soil samples <br /> will be collected at the base of the fill-sand within native soil, and 2 feet past the first sample. In soil <br /> borings where fill-sand is not encomtered, soil samples will be collected from approximately 5 and 9 fbg. <br /> CRA will prepare an exploratory bring log for each boring. <br /> Soil samples designated for cherval analysis will be collected in stainless steel or brass soil tubes, and <br /> sealed with Teflon tape and plat end caps. Samples will be stored appropriately and transported to a <br /> State-approved laboratory undcchain-of-custody. For quality control purposes, one laboratory split <br /> sample will be analyzed for evt 10 samples collected. <br /> 2 <br /> 060140 Worldwide Engineering,Environmental,l onstruetion,end IT Services <br />