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ti <br /> i <br /> Elinor Ratliff Page 2 <br /> January 2, 1994 <br /> I <br /> CURRENT STATUS <br /> All openings to the drain pipes were immediately filled with <br /> concrete to ensure that no liquids from the shop entered them <br /> after they were disconnected from the tank. The steel galvanized <br /> pipe was threaded together and stretches from the center of the E <br /> shop to the south exterior of the building where it terminated at <br /> the used oil storage tank. <br /> V <br /> Another length of pine extended from the west wall .of the shop to <br /> the used oil tank where it connected with the other pipe. All of <br /> the exterior pipe has been removed as part of the underground <br /> tank evacuation. <br /> No contamination was observed at the exterior of the building <br /> near the terminus of the used oil pipes. <br /> i <br /> Since the used oil flowed under gravity through the used oil <br /> tanks and was not placed under pressure, it is unlikely, given <br /> the age of the pipes that°' they could have corroded or leaked used <br /> oil. Toyota Town has, however, been requested to test the area <br /> around the pipes. <br /> SPECIFIC PROPOSAL <br /> We propose to drill holes through the concrete and take approxi- <br /> mately five (5) samples ,inside the building. We estimate that <br /> the pipes begin at approximately three ( 3 ) inches under the <br /> concrete on the north side of the building and terminate at <br /> approximately twelve (12) inches below the surface near the south <br /> side of the building where they exit. <br /> Four of the five holes will be placed at a depth of twelve" (12) <br /> inches below the surface of the soil. The fifth will be taken at <br /> eighteen (18) inches below the surface. <br /> The samples will be removed by hand auger taken at a distance of <br /> approximately twelve (12) inches from the pipes. <br /> The samples will be removed under the supervision of the County <br /> of San Joaquin. The soil will be placed into a sterilized con- <br /> tainer ensuring that there is no head space. <br /> A Chain of Custody document will be completed and the samples <br /> will be packed in dry ice and sent to a State certified laborato- <br /> ry. The State certified laboratory will run the standard BTEX w <br /> Test to screen for hydrocarbon materials. <br /> 1 <br /> k <br />