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2.0 SITE ASSESSMENT ACTIVITIES Mobilization for field assessment activities included: notification of Underground Services Alert (USA)regarding field operations at the Property;acquisition of a soil boring permit from the PHS- EHD; preparation of a site specific health and safety plan; and scheduling the field activities with the subcontractors and PHS-EHD regulators.A copy of the drilling permit is provided in Appendix A 2.1 SOIL AND GROUNDWATER SAMPLING On June 2, 1999 Ceres Associates drilled and sampled two soil borings at the Property. The soil borings were advanced by Vironex, Inc. using a direct-push drill rig and hand-advanced sampling equipment. 2.1.1 Sample Methodology Soil and groundwater samples were collected using Geoprobe® sampling equipment provided by Vironex,Inc.The Geoprobe®sampler utilizes direct push technology to collect soil and groundwater samples from specific subsurface depths without generating soil cuttings.The Geoprobe®sampling system employed during this investigation consisted of a two-foot long by 1.5-inch wide core barrel sampler which was used to discretely sample the soil borings.The core barrel sampler was lined with one 2-foot long acetate sample sleeve which was removed from the core barrel sampler for visual inspection after each sample interval was completed. Soil from the acetate sample sleeve was used for lithologic description and field screening purposes,as well as for containerizing the appropriate sample intervals for laboratory analysis. Once the selected sample interval was located, a 6-inch section of the sample tube was cut and separated from the remainder of the tube. The sample kept for laboratory analysis was sealed on both ends with Teflon®tape and plastic end caps,labeled with a unique identification number,placed in a Ziploc®plastic bag and stored in a chest cooled with ice for delivery to the laboratory. Soil not retained for chemical analysis was used for lithologic description and field screening purposes. Soil from each sample interval was field screened for the presence of volatile organic compounds (VOCs)using a Mini Rae photoionization detector(PID).Field screening was conducted by placing soil in a Ziploc®plastic bag and monitoring the atmosphere inside the bag with the PID.VOCs were not detected during field screening activities. "Grab"groundwater samples were collected by installing a temporary 3/4-inch diameter PVC well casing in each open borehole with groundwater being retrieved using polyethylene tubing equipped with a"check ball"fluid delivery system. "Grab"groundwater samples were placed in laboratory- provided 40 milliliter(mL),borosilicate glass vials equipped with Teflon®-lined septa.The sample containers were preserved with 0.5 mL of 18%hydrochloric acid(HCl) to reduce the potential for volatization or precipitation of chemicals of concern. The sample containers were then sealed and labeled, and placed in a chest cooled with ice for delivery to the laboratory. Q1Ceres Associates 3 Project CA518-2 WFB-CMO,Quality Cleaners,Tracy,CA June 8, 1999