ARCHIVED REPORTS_XR0012674 CASE 1

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r.9 1W MM" C BE FIELD PROCEDURES Site Safety Plan Field work performed by Applied GeoSystems at the site was conducted in accordance with Applied Geosystems' Site Safety Plan. This plan describes the safety requirements for drilling soil borings at the site. i he Site Safety PIan is applicable to personnel and subcontractors of Applied GeoSystems. Applied Geosystems'personnel and subcontractors scheduled to perform work at the site were briefed on the contents of the Site Safety Plan before work began. A copy of the Site Safety Plan was available for reference by appropriate parties during the work. The onsite Staff Geologist of Applied GeoSystems acted as the Site Safety Officer- or fficer- Sorin s Before drilling, Applied GeoSystems notified Underground Service Alert of our intent to drill so that approximate locations of underground utility lines and structures could be marked. NVe liand-augered each boring to a depth of approximately 5 feet below grade to A attempt to locate underground structures. The borings were drilled with a Mobile CME 55 drill rig equipped with S-inch-diameter,hollow-stem augers. The drillers steam-clez-.d the augers before drilling each poring to minimize the possibility of crass-contamination. &H-Sarripling in Borings Soil samples were collected at 5-foot intervals from the ground surface to the full depth of the borings. The soil samples were collected by advancing the boring to a point immediately above the sampling depth, and then driving a California-modified, split-spoon sampler containing equipped with clean brass sleeves through the: hollow center of the auger into the undisturbed native soil. The sampler and brass sleeves were steam cleaned or washed thoroughly with a laboratory-grade, non-phosphatic detergent and water before each use. The sampler was driven 18 inches with a standard 140-pound hammer repeatedly dropped 30 inches. The number of blows to drive the sampler each successive 6 inches were counted and recorded to evaluate the relative consistency of the soil. During sampling, the geologist used a field photoionization detector(PID) to characterize the relative levels of hydrocarbons. Field instruments such as the PID are useful for indicating relative levels of hydrocarbon vapors, but do not detect the concentration of hydrocarbons present with the same precision as laboratory analyses. One of the samples in brass sleeves not selected for laboratory analysis at each sampling interval was tested in the field using an PID. This testing was performer! by placing the intake probe of the PID against the soil after opening the brass container, Applied C7e0SysMIns