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December 22. 1995 Wright Project No. 4123-5 Site Oosure Report 4.0 q SCOPE OF SERVICES The scope of services have been performed in accordance with our proposal dated October 2, 1995, and include the following: • Conducting a surface reconnaissance of the site, as requested by the City Staff, to determine the area of impacted soils and develop remediation procedures. • Assessing the vertical and horizontal extent of petroleum hydrocarbon contamination within the soils underlying the site through the visual inspection of exploratory test pits. • Excavation and stockpiling of approximately 300 cubic yards of petroleum hydrocarbon contaminated soils. • Removal of groundwater from the excavation and discharging it to a sanitary sewer. • Providing for the collection of six confirmatory soil samples from the base and sidewalls of the excavation for laboratory analyses. • Collection of eight soil stockpile samples and providing for the composition and laboratory analyses of the retrieved samples for disposal at a landfill. • Providing for the collection of one groundwater sample after allowing groundwater to recharge the excavation. • Compilation and analysis of the field data • Preparation and submittal of this closure report. 5.0 PREFIELD ACTIVITIES 5.1 Surface Reconnaissance: Wright was contacted by the City of Tracy to investigate possible soil contamination that was encountered during the grading activities of a parking lot located adjacent to 1 lth Street and Fabian Street, within the northernmost section of the property at the site. Wright conducted a surface reconnaissance of the site on August 17, 1995, in an attempt to determine the extent of contamination and to develop remediation procedures. At the time of the reconnaissance, it was determined that the contamination appeared to be oil and grease and that subsurface test pits should be excavated within the area of staining to determine the vertical and horizontal extent of contamination. Upon completion of the exploratory test pits, affected soils would be removed and stockpiled at a designated area on the site. The soils would then be properly disposed at a landfill following their characterization. . 5.2 Magnetometer Survey Wright conducted a magnetometer survey of the proposed area of excavation on August 18, 1995, in order to determine the presence of underground utilities or other metallic features that may warrant concern. No metallic features were found that might preclude the presence of underground utilities or other subsurface features. An active Underground Service Alert (USA) has been established at the site by the grading contractor. 4