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Site Contamination Work Plan Phase I Site Assessment,ABF Freight Systems, Inc 2427 West Yosemite Avenue,Manteca,California Page 6 • 4.0 FIELD ACTIVITIES 4.1 Introduction A detailed description of each proposed task for the completion of the Phase I Site Assessment are presented in the following sections 4.2 Regulatory File Review and Receptor Survey CAL INC proposes to conduct a regulatory file review and receptor survey for the lands surrounding the ABF site The regulatory file review will include the review of State, County, and Local records for information on potential soil and groundwater contamination attributed to neighboring and surrounding properties The receptor survey will )Include the review of State, County, and Local records for potential sensitive ground and/or surface water receptors of diesel contamination associated with the former UST site Department of Water Resources well boring logs will be reviewed to identify drinking water well in the vicinity of the subject site 4.3 Underground Utility Clearance Prior to commencement of drilling activities, an underground utility clearance will be conducted The purpose of the underground utility clearance is to identify all subsurface utilities located on the site The utility clearance will consist of notifying Underground Service Alert (USA), who will provide a list of potential agencies and utility companies, which have underground utilities in the area 44 Soil and Groundwater Sampling Program CAL INC proposes to conduct a soil and groundwater investigation to assess the vertical and lateral extent of petroleum hydrocarbon contamination in soil and groundwater The goat of the soil and groundwater investigation is to collect sufficient quantitative data so that recommendations for either site closure or remedial action can be presented to the PHS/EHD and SWRCB The investigation will include the drilling and installation of four monitoring wells The proposed monitoring well locations will include one well in/or adjacent to the former 10,000 gallon UST excavation pit, two wells hydraulically down gradient from the excavation site, and one well hydraulically upgradient from the excavation site The direction of groundwater flow and the final locations of the monitoring wells will be determined through regulatory file review of groundwater elevations and flow directions recorded from wells in the vicinity of the subject site Prior to drilling, permits for completing monitoring wells will be obtained from PHS/EHD The purpose of monitoring well installation is to evaluate the vertical and lateral extent of petroleum Hydrocarbons in the vicinity of the former 10,000 gallon UST Characterization of any off-site soil or groundwater contamination is beyond the scope of this work plan iThe monitoring wells will be drilled using 8-inch diameter hollow stem auger equipment and will be complete to 20 feet in depth All of the wells will be screened from first water (12 feet) to approximately 20 feet in depth Soil samples will be collected with depth using a split spoon sampler Each soil sample will be screened for odors and screened with a photoionization N 1PRO�ECTS132721P1ans and Reportslworkplan doc April 13, 1998