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Additional Soil and Groundwater Investigation and Monitor Well Installation Report CSUS Multi-Campus Regional Center January 11,2002 Page 2 (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. On December 28 and 29, 2000, Condor conducted a limited soil and groundwater investigation with the installation of five direct push borings utilizing Geoprobe® direct push technology at site. Condor prepared the Preliminary Investigation and Evaluation Report(PIER), dated February 7, 2001, describing LW the results of the work. Laboratory analytical tical 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). Based on the results of the investigation, Condor recommended the following: • The installation of a minimum of three 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 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. • 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. • 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. 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. At the request of Mr. David Rosso for the Trustees of the California State University, Condor prepared the Work Plan - Additional Soil and Groundwater Investigation, dated October 5, 2001. The proposed work included the installation of CPT borings, direct W push borings, and monitor wells and the completion of a SRS to identify potential sensitive receptors within a 2,000-foot radius of the site. The work plan was approved by Ms. Rebecca Setliff of the PHS/EHD in a letter dated November 14, 2001 to Mr. Cliff Bailey of CSUS. 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 A drilling permit application was prepared by Condor and submitted to the PHS/EHD for three proposed CPT borings and four proposed direct push soil borings. Condor received the drilling permit prior to initiating any fieldwork. The proposed soil boring locations were marked with white paint and Underground Service Alert (USA) was notified 72 hours in advance of the fieldwork to locate and identify underground utilities in and near the work area. However, because the proposed boring locations were on private property, some utilities contacted by USA did not mark their lines past property i, boundaries and on to the site. Therefore, it was the responsibility of the property owner to locate and identify underground utilities in and near the work area. The PHS/EHD was notified of the fieldwork schedule 72 hours in advance. is CONDOR L.