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i 16CLEARWATER G R o U P, I N C 2.0 FIELD ACTIVITIES ' Prior to commencement of field work, all on-site personnel attended a health and safety meeting and signed the Clearwater Site Safety Plan presented in Appendix A 2.1 Soil Boring Advancement Using CPT Equipment ' On September 18, 1995 a soil boring (CPTB-7, shown in Figure 2) was advanced into the saturated zone using CPT equipment. The CPT rig was used for the purpose of obtaining discrete soil samples while minimizing the potential for cross- contamination from shallow groundwater. The scope of work did not include obtaining water samples from deeper zones, the objective of sampling deeper soil was stated in the PHS letter dated June 14, 1995 and in the Revised Workplan for the ' Conrady Property The weight of the CPT rig (approximately 20 tons) is used as a reaction to advance the soil sampler with a hydraulic ram, located in the center of the truck Soil sampling was accomplished by pushing 1.75-inch-diameter steel rods with a cone- shaped tip to the desired sampling depth At that depth, the rods and the cone were retracted inside the sampling barrel and the barrel, lined with three six-inch-long stainless steel sample tubes, was pushed through the desired sample interval. Soil samples were collected at approximately five-foot intervals between the'depths of 42 and 80 feet bgs I Portions of each soil sample were sealed in a plastic bag and screened in the field for organic vapors using a Sensidyne® model flame ionization detector (FID) During drilling, soil samples were described and classified by a Clearwater geologist G according to the visual methods of the Unified Soil Classification System (ASTM D2488-93). Sample locations, soil descriptions and FID readings are shown on the boring logs presented in Appendix B When recovered at the surface, the sample tubes were sealed using Teflon sheets and plastic caps and submitted to the laboratory for chemical analyses Laboratory samples were documented on a chain of custody form and p1`aced in a 'cooler,for Iit {I I I itI' j shipment to American Environmental Network (AEN), I a ,state-certified I i ; environmental laboratorylocated in Pleasant Hill, ,California Tl1e,samples I collected � i I I ii1 I i by the,CPT�rYg were, analyzed for'totaI petroleum�hyldroclarb'ons as gasoline (TPHg) I III by modified EPA Method 8015, grid benzene, toluene,;ethylbenzene, and,x lenes�!l;l I It (BTEX) with`methyl-tern butyl ether (MTBVby modified EPA Method 8020 'At the II t rl i li l ''; I II Itl 411 I I ,� I•�i I I ,I bibil PAR/3Q/PILOT II 3 I I' E-IIII I il u'4i`�i Idl lil IA� I Dial lIli1l II,N+I llllq vt�Ilt11�°I I14ftIIEII{ II III'i11 I''G'y`�i It ll 'It I 'i , I i1u Ili Itldl II``I'I 11111 i ! I c