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.r Work Plan—Additional Soil and Groundwater Investigation CSUS—Multi-Campus Regional Center October 5,2001 Page-2- dated June 21, 2000. In a Ietter dated July 7, 2000, Ms. Carol Oz of the PHS/EHD approved the work plan (with modifications) and requested that the work be conducted within 90 days and that a report of findings be submitted within 60 days of work completion. r� On December 28 and 29, 2000, Condor conducted a limited soil and groundwater investigation utilizing Geoprobe® direct push technology at site. The locations of the five direct push borings installed are shown in Figure 2, Appendix A. Condor prepared the Preliminary Investigation and Evaluation Report (PIER), dated February 7, 2001, describing the results of the work. Laboratory analytical results of the soil and groundwater samples and field observations indicated that petroleum hydrocarbons were present in site soil and groundwater down to the approximate total depth of the investigation (36 feet below grade). Historical soil and groundwater analytical data are presented in Table A and Table B, respectively, in Appendix B. Based on the results of the investigation, Condor recommended the following: • The installation of a minimum of three cone penetrometer (CPT) borings to investigate the geology '-� at depth at the site. • The installation of a minimum of three direct push borings to collect soil samples and the installation t-- of a minimum of three Hydropunch borings to collect discrete groundwater samples, at depths to be determined by the results of the CPT borings, for the purpose of evaluating the vertical and horizontal distribution of petroleum hydrocarbon impacted soil and groundwater at the site. 0 The installation of a minimum of three groundwater monitor wells to establish the groundwater gradient and to monitor the concentrations of petroleum hydrocarbons in groundwater at the site. V • The completion of a sensitive receptor survey within a radius of 2,000 feet of the site to investigate the potential for receptors that may be impacted by petroleum hydrocarbons in the groundwater. V In a letter dated April 4, 2001 to Mr. Cliff Bailey of CSUS, Ms. Dot Lofstrom of the PHS/EHD concurred with the recommendations contained in the PIER. v 3.0 CPT AND DIRECT PUSH BORING FIELD PROCEDURES This section includes a description of the site preparation, CPT procedures, and direct push boring procedures. 3.1 SITE PREPARATION V Condor will complete soil boring permit applications and obtain the required permits prior to the fieldwork. Condor will schedule and coordinate all field activities through CSUS. The proposed boring 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 3.2 CPT 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. CPT borings will be advanced at three locations to an approximate depth of 75 feet below ground surface (bgs). The V i, CONDOR v