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Site Characterization Report ABF Freight System,Inc Manteca,California page 4 • Samples submitted to the laboratory were accompanied by the proper chain of custody documentation The chain of custody form was properly signed and the date of collection and shipment recorded, along with the sample site identification and requested analyses for each sample The laboratory used a cooler receipt form to document the condition of samples on arrival at the laboratory 3 3 3 Field Monitoring Instrumentation Soil Samples collected during the drilling operations were screened using a PID Prior to use, the PID was calibrated to 0 and 100 ppm isobutylene standards The PID battery was charged daily, and the calibration information was documented daily in the field notebook 3 3 4 Laboratory QA/2C The laboratory QA/QC program consisted of calibration and analyzing duplicate samples, method blanks, matrix spike/matrix spike duplicates (MS/MSD), and evaluating surrogate recoveries The laboratory QA/QC program is summarized with the laboratory analytical reports in Appendix 7 3.4 Equipment Decontamination . All drilling and soil sampling equipment was cleaned using a high-pressure hot water washer between each boring The decontamination activities were conducted over a catch basin and the rinsate water was stored in a 55 gallon drum Soil sampling equipment and water level measuring equipment were decontaminated between sampling events Since all groundwater sampling was conducted with disposable bailers, no decontamination of groundwater sampling equipment was necessary 3.5 Site Restoration The installation of the monitoring wells included the placement of Christy Boxes over the top of the PVC casing The Christy Boxes were placed flush with the ground surface and cemented in 3.6 Waste Handling and Disposal Wastes generated as part of the soil and groundwater sampling activities were placed in DOT- approved 55-gallon steel drums and stored onsite pending receipt of analytical results The drums were labeled designating the generator as "ABF Freight System, Inc " Following completion of laboratory analyses, all soil and water waste was disposed of on site At the request of ABF Freight System, Inc the soil was moved to a portion of the property along the eastern fence line that consisted of dirt and overgrown weeds, where the soil and water were spread out over the ground 11SERVERIIC-DRIVEIPROJECTSl32721P1ans and ReportslAi3F Freight Site Characterization Closure Report doc 11/17/98