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prepare future groundwater elevation maps for the Site. <br /> 4.3.5 Groundwater Monitoring <br /> The newly installed wells will be sampled in conjunction with quarterly groundwater <br /> monitoring of the existing wells (MW-1 through MW-4). Prior to sample collection, each well <br /> will be purged a minimum of three casing volumes of groundwater with a dedicated Waterra <br /> sampling system. Water quality parameters (temperature, pH, and specific conductance) will <br /> be measured utilizing calibrated field instruments. The purged water will be stored in 55- <br /> gallon drums, pending offsite disposal. <br /> Groundwater samples will be placed in pre-cleaned, laboratory-supplied containers. The <br /> containers will be sealed, labeled, stored on ice in a cooler, and transported under chain-of- <br /> custody protocol to a state-certified analytical laboratory. The groundwater samples will be <br /> analyzed for TPH-g, BTEX,MTBE, and TBA by EPA Method 8260B. <br /> 4.4 DISPOSAL OF INVESTIGATIVE-DERIVED WASTE <br /> Soil and water derived from drilling and well installation activities will be contained in <br /> Department of Transportation (DOT)-approved drums stored temporarily at the Site. A <br /> composite soil sample and a water sample will be collected and submitted for laboratory <br /> analyses. The samples will be analyzed for TPH-g by EPA Method 8260B, total petroleum <br /> hydrocarbons quantified as diesel (TPH-d) and motor oil (TPH-mo) by EPA Method 8015M <br /> with a silica gel cleanup, BTEX and MTBE by EPA Method 8260B, and total lead by EPA <br /> Method 6010. The waste will be profiled and delivered to an approved disposal facility. <br /> 4-5 DATA EVALUATION AND REPORTING <br /> After the direct-push field activities have been completed, ETIC will evaluate the analytical <br /> data and recommend to SJCEHD the specific location to install groundwater monitoring well <br /> MW-5. Upon receiving approval from SJCEHD, monitoring wells MW-2A and MW-5 will be <br /> installed. Following the completion of all field activities, ETIC will prepare a written report <br /> which will include the results of the direct-push and monitoring well installation activities. <br /> Boring and well locations will be illustrated on a map of the Site. Field procedures and <br /> laboratory methods will be described in the report, and technical data collected during the <br /> sampling program will be tabulated and evaluated. In addition to a narrative summary of field <br /> efforts and analytical data, the report will include conclusions and recommendations regarding <br /> further assessment and/or remediation for the Site. <br /> SLCcntc-SCM and Rev.R1 WP 2007.09 18 <br />