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Subsurface Investigation 315 Enterprise Place <br /> January 13, 2000 Tracy, California <br /> 1.0 INTRODUCTION <br /> At the request of Mr. Ron Valladao of Resource Capital, Lush Geosciences, Inc. <br /> conducted this subsurface investigation of the property located at 630 B Street in Marysville, <br /> California(Site)(Figure 1, Figure 2). <br /> 2 <br /> 1.1 Purpose <br /> The purpose of this investigation was to evaluate the extent of contamination beneath <br /> the Site from a former diesel tank on the adjoining property to the west_ An underground <br /> diesel storage tank removed from the former J.B. trucking site located adjacent to and west of <br /> the subject property. The former tank was removed in 1997; soil samples showed 6,200 ppm <br /> diesel and groundwater samples showed 31 ppm diesel. Our previous review indicated that <br /> no further action has been taken by the adjacent property owners or by state and local <br /> agencies to assess or mitigate the detected contamination. The purpose of this work was to <br /> provide information regarding the concentrations and lateral extent of diesel fuel in the <br /> subsurface on the subject property from the former tank. <br /> 2.0 EXPLORATION <br /> On October 25, 1999, Lush Geosciences, Inc. excavated a trench (T1, Figure 2)to a <br /> maximum depth of approximately 10 ft to assess soil and groundwater conditions at the site. <br /> The trench was located in near proximity to the former tanks, based on sketch maps from the <br /> adjoining property. <br /> Soil samples were collected from the backhoe bucket by driving clean brass sleeves <br /> into relatively undisturbed soil in the backhoe bucket. The sleeves were then sealed with <br /> aluminum foil, plastic caps, and airtight tape. The sampled soil came from depths of 8 ft and <br /> 10 ft, and corresponded to discolored zones in native soil with a diesel odor. Groundwater <br /> was encountered at a depth of 9 to 10 ft. A water sample was collected from the backhoe <br /> bucket. <br /> Soil samples from the excavation were analyzed for total petroleum hydrocarbons as <br /> diesel (TPHd) total petroleum hydrocarbons as gasoline (TPHg) using EPA Method 8015 and <br /> for the volatile fuel constituents benzene, toluene, ethylbenzene, and xylenes (BTEX) using <br /> 9015-025 -1- <br />