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3 0 SCOPE OF WORK <br /> The purpose of the current investigation was to determine the extern of the reported <br /> release of total petroleum hydrocarbons (diesel and waste oil) at the site Impacts to the <br /> soil and groundwater in the vicinity of the former diesel USTs was assessed A <br /> California licensed dnlhng contractor (V & W Drilling) was hired to advance the soil <br /> borings, collect soil samples and construct two (2) groundwater monitoring wells at the <br /> locations indicted in Figure 3 Excavation, logging and sampling of three (3) soil <br /> borings, and construction of two (2) groundwater monitoring wells in two (2) of these <br /> three (3) soil borings was completed in the vicinity of the former UST excavation on 4 <br /> December 1999 A Geologist, registered in the State of California, completed logging of <br /> the borings Soil samples were collected in each of the three (3) soil borings Twelve <br /> (12) soil samples were analyzed as described below for petroleum hydrocarbons The <br /> new groundwater momtonng wells were developed by surging and purging on 4 <br /> December 1999 Mr Jeffrey C F Wong of the San Joaquin County Pubhc Health <br /> Services Department witnessed this work Top of well casing elevations, in relation to <br /> mean sea level, were established by Kier & Wright Civil Engineers and Surveyors <br /> (Appendix D) <br /> Finally, the <br /> analyses of the soil samples and groundwater were obtained, and the Report <br /> of Investigation was completed <br /> 3.1 Field Preparation <br /> A monitoring well permit was obtained from the County USA Alert was notified along <br /> with Cal Tk so that all underground pipelines, cables, wires, etc could be located Also, <br /> the site was inspected for overhead lines Field preparations at the site included a pre- <br /> construction meeting between Environeenng, Inc and the drilling contractor <br /> 3.2 Drilling, Logging and Soil Sample Collection <br /> V &. W Drilling was contracted to drill and sample three (3) soil borings, and to convert <br /> two (2) of these soil borings into groundwater monitoring wells Bore holes for the <br /> groundwater monitoring wells were drilled using a truck-mounted, hollow stem auger <br /> Emrtroneering.Inc. Project No 99-012.02 3 <br />