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2. INVESTIGATION ACTIVITIES The following sections describe the field activities associated with this investigation • Activities include preparation of a Health & Safety Plan, permitting, monitoring well ' reconnaissance, utility and geophysical surveys, soil and groundwater sampling, monitoring well installation, monitoring well development, on-site and fixed laboratory analyses, Quality Assurance/Quality Control (QA/QC), decontamination of field equipment, monitoring well ' survey, and soil and groundwater residual management i 2.1 Health and Safety Plan I The health and safety considerations for field activities were defined in asite-specific Health and Safety Plan All field personnel were given time to review and sign the plan prior to ' commencing field activities In addition, health and safety meetings were conducted at the start of each day during field activities to identify and minimize concerns of the field personnel ' 2.2 Permitting ContiGroup and Haley & Aldrich obtained the necessary permits from SJCEHD for drilling soil borings and installation of the monitoring well In addition, Haley & Aldrich provided SJCEHD with 48 hours notice prior to drilling to allow for site inspections 2.3 Utility Survey and Well Reconnaissance lie On 17 March 2004, Haley & Aldrich attempted to mark out and clear the boring locations with Underground Service Alert (USA) The majority of the investigation area was not accessible, however USA confirmed there were no public electrical, gas, or water lines within ' the proposed investigation area On 5 April 2004, NorCal Geophysics conducted an on-site geophysical survey to clear the investigation area for private utility lines One private water line was delineated and only a minor adjustment to the location of boring HA-1 was ' necessary While on-site, NorCal Geophysics assisted in locating previously existing monitoring wells that were covered and could not be found 2.4 Soil and Groundwater Sampling 2.4.1 Soil Sampling Soil samples were collected from nine borings (HA-1, HA-2, HA-4, HA-6 through HA-9, TANK-EX, and MW-7) Boring locations are presented on Figure 2 Soil samples were collected from HA-1, HA-2, HA-8, and MW-7 at five foot intervals ' from approximately 10 to 35 ft bgs A soil sample was collected from HA-4 at 28 ft bgs Soil samples were collected from HA-6 at five foot intervals from approximately 10 to 25 ft bgs and at 28 ft bgs Soil samples were collected from HA-7 at 20 and 28 ' ft bgs Soil samples were collected from HA-9 at five foot intervals from 10 to 25 ft bgs Soil samples were collected from TANK-EX at 10 and 15 ft bgs No soil samples were collected from HA-3 or HA-5 Samples obtained using the hollow stem auger rig were collected using a California split spoon sampler outfitted with 2-in diameter brass tubes Samples obtained with 1 ' 4