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.i FIELD PROCEDURES ii i �i Safety plan The Site Safety Plan describes the basic safety requi ements for the subsurface investigation at: the site. The Site Safety Plan is applicable to personn 1 of Ground Zero Analysis, Inc. (Ground Zero) and to subcontractors of Ground Zero. Person 1 scheduled to work at the site are briefed on the contents of the Site Safety Plan before work begins. A copy of the Site Safety Plan is kept at the work site and be available for reference y appropriate parties during work at the site. A technician from Ground Zero will be designated the on-site Safety Officer. ;I Hgnd-Augering Soil Borings I ii Soil borings will be hand-augered to a depth of approximately 8-10 feet below grade. The l equipment is cleaned before augering the borings to minimize the possibility of cross- r contamination. Holes are cut in the surface material ( oncrete or asphalt) to allow access to the soil. Upon completion and after sampling, the borigs are then grouted to surface with neat cement. 'M The drilling is performed under the guidance of a fi ld geologist. Soil encountered is logged using visual and manual methods as drilled using the Unified Soil Classification System. A photoionization detector (PID) is used if necessary to evaluate soil samples for gasoline hydrocarbons. Field instruments such as the PID aie useful for indicating relative levels of gasoline hydrocarbon vapors but do not detect the conc tration of gasoline hydrocarbons present with the same precision as laboratory analyses. Subjective evidence of gasoline hydrocarbons such as soil discoloration or obvious odor are noted. Soil Sampling in Borings !p Soil samples are collected at specified depths from the ground surface to the total depth of the borings. The soil samples are collected by advancing the boring to a point immediately above the sampling depth, and then driving a percussion sampler containing a brass sleeve into the relatively undisturbed soil. The sampler and brass sleeves are washed thoroughly with a laboratory-grade, non-phosphatic detergent and water before each use. Il Sample Labeling and Handling, I� .i Soil samples selected for possible laboratory analysis are removed from the sampler and quickly sealed in their brass sleeves with Teflon sheets and plastic caps. The respective sample °I containers are labeled in the field with the job number, sample location, depth if applicable, and date, and promptly placed in iced storage for transport to the laboratory. Chain of Custody Records are initiated in the field by the geologist and accompany the samples to a laboratory i I€ certified by the State of California to perform the analyses requested. g rowtdzelmisclmunser.wkp i'. i; I� a I II