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Harding Lawson Associates <br /> -designated TN-14 and TS-14. Four samples were collected in native soils beneath the <br /> former product pipe ,(PPI-3, PP2-2.5, PP3-2.5 and PP4-3), one for each joint located <br /> along the 80-foot section of pipe between the dispenser island and tank excavation <br /> L boundary. One sample, DI-2.5, was collected from beneath the former dispenser island. <br /> Sampling locations are shown on Plate 2. <br /> The excavation was backfilled, compacted with tank backfill sand and imported <br /> sand, and resurfaced with aggregate-base material and asphalt concrete to match existing <br /> L grade. This work was performed by Trumpp Brothers. Compaction of the backfill <br /> LI materials in the tank excavation was completed using backhoe-mounted roller <br /> equipment on approximately 2-foot-thick lifts from the bottom of the excavation to a <br /> L, depth of about 3 feet; the remaining depth was compacted in 1-foot lifts with portable <br /> 1 Whacker vibratory compaction equipment. In the southern end of the excavation, where <br /> Oe tank had extended beneath an aboveground loading dock by about 6 feet; a space of <br /> U <br /> approximately 2 feet beneath the dock could not be backfilled with compacted sand; <br /> therefore, a controlled-density cement slurry was injected into this area to provide <br /> structural integrity between the compacted backfill material and overlying loading dock. <br /> L <br /> I <br /> The piping trench backfill was compacted using Whacker equipment. <br /> LSoil samples were analyzed for total petroleum hydrocarbons (TPH) as diesel and <br /> gasoline, and for benzene, toluene, ethylbenzene and xylenes (BTEX). Samples were also <br /> i <br /> analyzed for ethylene dibromide (EDB) and organic lead, because the tank at one time <br /> had apparently.stored leaded gasoline (as noted on the former dispenser).. <br /> i.� <br /> Review of analytical results indicates that TPH as diesel and gasoline were not <br /> Ldetected above laboratory detection limits (10-ppm) in any of the soil samples, with the <br /> exception of sample DI-2.5, collected beneath the former dispenser. Gasoline was t <br /> L <br /> T19461-H 6 of 20 <br /> L <br />