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fr Work Plan—Additional Soil and Groundwater Investigation CSUS—Multi-Campus Regional Center October 5,2001 Page-4- V Each soil sample will be cut from the liner at the selected depth for potential laboratory analyses. The orphan soil samples will be retained, undisturbed, in the liners. The liners will be sealed at the ends with Teflon® sheeting, capped, and labeled. The samples will be placed in a cooler chilled with Blue Ice®, and delivered under chain-of-custody procedures to a California certified laboratory for analyses. 4.0 MONITOR WELLS—FIELD AND ANALYTICAL METHODS This section includes a description of the site preparation, drilling procedures, and monitor well installation, construction, surveying, development,and sampling. 4.1 SITE PREPARATION Condor will complete monitor well permit applications and obtain the required permits prior to the fieldwork. Condor will schedule and coordinate all field activities through CSUS. The proposed monitor well locations will be marked with white paint and Underground Service Alert (USA) will be notified at �+ least 72 hours in advance of the fieldwork to locate and identify underground utilities in and near the work area. Because companies contacted by USA may not identify utilities past private property lines and into the site,however, it is the responsibility of the property owner to identify any site utilities. V 4.2 DRILLING PROCEDURES Prior to commencement of fieldwork, a tailgate safety meeting will be held and a site-specific Health and Safety Plan will be discussed with, and presented to, all field personnel for their signatures. Three or four monitor wells will be installed at the site. The number and location of the wells will be determined following analysis of the data collected from the CPT and direct push borings and soil and groundwater sample laboratory analytical results. The monitor well borings will be drilled using 8-inch outside diameter, continuous-flight, hollow-stem auger. The hollow-stem auger and other down-hole equipment will be decontaminated between borings by steam cleaning to prevent cross-contamination. During the previous phase of investigation, groundwater was encountered in the direct push borings at depths of 41 to 45 feet bgs. Groundwater rose �+ in the borings to a depth of approximately 35 feet bgs. The monitor well borings will be drilled to the first depth at which groundwater is encountered, anticipated to be between 40 and 50 feet. All drilling activities will be observed by a Condor geologist. V Drill cuttings for the monitor well borings will be logged according to the USCS. Descriptions of soil types encountered and any other pertinent field observations will be recorded on boring logs. Cuttings r.+ will be placed in a polyethylene bag and checked with a PID for the presence of hydrocarbons. All visual observations and PID measurements will also be noted on the boring logs. t,... One soil sample will be collected from each monitor well boring. The depth at which the sample is collected will be determined by the results of the CPT and direct push borings. The soil samples will be collected during continuous-flight hollow-stem auger drilling using a California-modified, split-spoon WO sampler fitted with three clean brass liners. During the sampling,the split-spoon will be driven ahead of the auger. The uppermost liner will be discarded. The middle sample liner will be used for geological logging and PID measurements. Each sample will be retained, undisturbed, in the brass liner; sealed at the ends with Teflon®sheeting; capped; and labeled. The samples will be placed in a cooler chilled with Blue IceU and delivered under chain-of-custody procedures to a California certified laboratory for 1.1 t� CONDOR r