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' Work Objectives/Scope: Conduct soil and groundwater investigation related to a former <br /> underground storage tank(UST) For this investigation, soil and groundwater grab samples will <br /> be collected from twelve (12) soil borings using a Geoprobe 5400 Direct Penetration Technology <br /> (DPT) ng <br />' Activities Planned (Check those that are applicable) <br />' Underground storage tank removal <br /> oversight of soil excavation with backhoe or other equipment <br />' Confirmation soil sampling dunng soil excavation and removal <br /> soil gas survey <br />' X soil boring and soil and groundwater grab sampling <br /> drilling of wells, including installation, development and sampling of groundwater <br /> iand soil <br /> Groundwater sampling of onsite wells <br /> other <br /> H. SI'Z'E INFORMA'T'ION <br /> Site Description: The site is located at 503 East Tenth Street in the city of Tracy (San <br /> Joaquin County), California The site is an active agricultural commissioner's office situated <br /> within a complex of county and city offices <br /> Unusual Features: Possible underground utility lines Underground Service Alert (USA) will <br /> be called at least 48 hours prior to site work Geoprobe operator will be asked to hand auger <br />' and/or probe to five feet below ground surface (bgs) if drilling near any underground utility lines <br /> Site Background/History: The site formerly contained three USTs The USTs contained <br />' unleaded gasoline and weed oil (i e , diesel fuel) until they were removed in 1988 Soil beneath <br /> the USTs contained up to 4,800 parts per million(ppm) of Total Extractable Petroleum <br /> Hydrocarbons (TEPH) and 760 ppm of Total Volatile Petroleum Hydrocarbons (TVPH) <br /> Groundwater was not encountered at a maximum excavation depth of 10 feet bgs The extent of <br /> impacted soil was not defined <br /> 2 <br /> 1 <br />