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1.4 BACKGROUND INFORMATION 1.1 Site Description 1 History The site is located on the northern side of Yosemite Road due east of Airport boulevard within the city limits of Manteca, California(Figure 1). Theproperty is owned by Ted Peters Trucking, who operates a commercial trucking facility from the property. There are currently no underground fuel tanks located on the property. The site consists of a home converted into office space, dispatch office, maintenance/service buildings and a outside parking area around the facility. The facility lot is located on approximately 3 acres of land and is surrounded by open fields or residential dwellings. (Figure 2). The site is level and at an elevation of about 20 feet above sea level. There is no concrete or asphalt immediately surrounding the main building or previous location of the underground storage tank. The lot is primarily covered with gravel & native soil. The surface water for the site is channeled towards the northern end of the p operty. No engineered subsurface storm water drainage system exists at this site. 1.2 Geology and Hydrogeology A baseline detailed geological or a hydrogeological sessment has not been performed at this site. The depth to water at the property, has previou dy been reported to be between 7 and 11 feet below the ground surface. Characteristics of the aquifers and occurrence of groundwater at the site is anticipated to be typical of this area and for he San Joaquin Valley groundwater basin. Groundwater gradient trends for the site are not kn wn at this time. Due to the anticipated shallow first groundwater interface, the storm water drainage and surface flood irrigation practices in the area are suspected of possibly influencing the ground water gradient flows and directions. 1.3 Previous Work On July 30th 1997, one steel 1000 gallon gasoline un erground storage tank was removed from the south center area of the site. The tank contained eaded gasoline. Upon removing the tanks the San Joaquin inspection report indicates that corrosion was present on the tank and a petroleum odor was noticeable at the northern endo f the tank pit. The subsequent laboratory analysis of the soil in the tank pit area indicates at a release of a petroleum hydrocarbon product (primarily gasoline) has occurred. At the inorthern end of the tank pit the analytical results were 298 ppm of total petroleum hydrocarbons in gasoline. The benzene results were 204 ppb, toluene 7090 ppb, ethyl benzene 2470 ppb, total xylene 14,900 ppb and M.T.B.E. 83,500 ppb, respectively. A limited over excavation was co ucted in the general area of the tank field. The lower limit of the excavation ceased at approximately 8 vertical feet. No water samples were collected. The excavated soil was contained and a composite sample was collected. The excavation was then lined with 6-mill poly plastic and filled with the spoils of the excavation. Clean backfill was imported to complete the proces and the area was finished off six inches higher than the to the surface grade to shed off surface water. TED PETERS TRUCKING 1 M CA WORKPLAN 1