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• 11 Environmental Hazardous Materials Assessment Work Plan ACE Equipment Maintenance Facility,Stockton,CA Page 2 3.1 SITE PREPARATION Condor will complete a drilling permit application and obtain the required permit from the San Joaquin County Environmental Health Department (EHD) prior to the fieldwork. Condor will work with the SJRRC to acquire a Right of Entry Permit from the UPRR to access the site. Condor will schedule and coordinate all field activities through the UPRR, the driller, and the EHD as needed.The proposed boring locations will be marked with white paint and Underground Services Alert(USA) will be notified at least 72 hours in advance of the fieldwork to locate and identify underground utilities in and near the work area. A professional line locator company will be contracted to locate buried utilities at the site prior to any exploratory activities. Condor is aware of the presence of one buried fiber optic cable along the western boundary of the site. 3.2 SOIL BORINGS General Railroad Use Three lines of six borings each (a total of 18 borings) will be advanced at the approximately 3,500-foot long by 200-foot wide site. Each line will be oriented in a north-south direction: one along the eastern site boundary, one along the western side of the railroad sidings, and one along the western site boundary. Boring locations on the three lines will be staggered and moderately biased towards the proposed facility locations. The boring locations along the western site boundary will be adjusted as necessary to avoid the underground fiber optic cable present on this portion of the site. Eleven borings will be advanced to a minimum depth of five feet below the ballast/native soil interface. Seven borings will be advanced to groundwater(approximately 30 to 40 feet below ground surface). The proposed boring locations are shown in Figure 2, Appendix A. A licensed C57 drilling contractor will drill the borings under the supervision of a Condor geologist. The borings will be advanced using a Geoprobe percussion hammer driven sampler and continuous-flight hollow-stem augers. The Geoprobe® will be equipped with a 1.75-inch O.D., 4-foot long core barrel, fitted with a clean, single use, polyethylene liner. Soil sampling during continuous-flight hollow-stem auger drilling will utilize a California-modified, split-spoon sampler fitted with three clean brass liners. The soil samples will be screened for the presence of organic vapors in the field with a photoionization detector (PID). Following completion of the sampling, the boreholes will be filled with neat cement. Three borings will initially be hand- augered to a depth of five feet below ground surface (bgs) prior to drilling in order to comply with the UPRR Right of Entry requirements,if so designated. Aboveground Storage Tanks Four angled borings will be advanced to points directly beneath the three end-to-end ASTs on the northern portion of the site. The borings will be advanced near the ends of each AST from the downgrade (west) side of the ASTs to a minimum vertical depth of ten feet below ground surface.The proposed boring locations are shown in Figure 2,Appendix A. The borings will be advanced using a Geoprobe® percussion hammer driven sampler equipped with a 1.75-inch O.D., 4-foot long, core barrel, fitted with a clean, single use,polyethylene liner. A licensed C57 drilling contractor will drill the borings under the supervision of a Condor geologist. The soil samples will be screened for the presence of organic vapors in the field with a ow %41 CONDOR