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VVZ1 INC <br /> immediately below the former Tank #1 location but no soil samples were collected as it <br /> was determined in the field that a follow up investigation would be required <br /> Tank#2 was removed from the subsurface and found to not contain any holes in the sides <br /> or bottom The soil immediately under the tank was noticed to have a slight discoloration <br /> and odor of heating fuel oil The discolored soil and odor was found to be present only <br /> immediately under the tank to a distance of not more than 12 inches beneath the base of <br /> the tank Exploratory trenching was conducted at the former location of Tank #2 to a <br /> depth of 5 feet below the base of the tank This exploratory trenching indicated that no <br /> significant volume of hydrocarbon impacted soil was present beneath this tank <br /> Exploratory trenching revealed that the soil investigated immediately under Tank#1 was <br /> impacted by gasoline fuel and an unauthorized hydrocarbon release (UAR) report was <br /> filed with the San Joaquin County Public Health Services Environmental Health Division <br /> (PHSEHD) by the owners of Hi Hopes immediately after the tank removal The owners of <br /> Hi Hopes provided PHSEHD with a preliminary investigation workplan for exploratory sail <br /> boring to determine the extent and character of hydrocarbon impacted soil at the property <br /> WZI provided geologic oversight of the exploratory soil boring effort <br /> Five soil borings were drilled in the former yard area of the property to a maximum depth <br /> of 56 5 feet below ground surface The soil borings were placed to assist in determining <br /> the vertical and horizontal extent of hydrocarbon impacted soil in the area around the <br /> former location of Tank#1 The soil borings were drilled with an 8-inch diameter hollow- <br /> stem auger and soil samples were collected at vertical intervals of ten-feet with an 18-inch <br /> long split spoon sampler The sal samples were analyzed for total petroleum hydrocarbon <br /> as gasoline and diesel fuel using U S Environmental Protection Agency (USEPA) Test <br /> Method 8015 (modified) Soil samples were also analyzed for benzene, toluene, <br /> ethylbenzene, and xylene fuel components using USEPA Test Method 8020 The sample <br /> that was determined to have the highest concentration of total petroleum hydrocarbon as <br /> 08220010 0111 2 <br />