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•rr �,5 • � r Once the tanks had b,.en removed and the confirmation soil samples collected, the excavation was -- lined with plastic and the overburden soils were replaced in the hole In order to segregate the stockpiles according to the area from which they were removed, plastic was placed in-between each pile Once filled, the area was covered with plastic to retard potential precipitation The excavation was to remain in this condition pending soil sample analytical data 30 SOIL SAMPLE COLLECTION ACTIVITIES -� In conjunction with the tank removal, three soil samples from the excavation bottom beneath each tank were collected for laboratory analysis Additionally, two composite soil samples were collected from each 50 cubic yards (CuYds) of stockpiled excavation overburden which was estimated to be a total of approximately 180 CuYds Since the overburden for each tank was stockpiled directly adjacent to the individual tank area from which it was removed, the analytical methods for the overburden corresponded directly with those required per the previous tank contents Figure 3 shows the locations from which the soil samples were collected with the corresponding sampling collection identification number The following table provides a listing of the individual sample analytical parameters _ TABLE 1 SOIL SAMPLE ANALYTICAL PARAMETERS SAMPLE IDENTIFICATION NUMBER(S) ANALYTICAL PARAMETERS DSS1, DSS2, DS, DM, DN TPN-D, BTX&E LGSS2, LGSS1, LGS, LGM, LGN TPH-D, BTX&E, EDB, TL ULSS1, ULSS2, UGS, UGM, UGN TPH-G, BTX&E BSS-1 TPH-D, TPH-G, BTX&E, EDB, TL Notes TPH-D = Total Petroleum Hydrocarbons as Diesel, DOHS Method 8015 TPH-G = Total Petroleum Hydrocarbons as Gasoline, DOHS Method 8015 BTX&E = Benzene, Toluene, Xylene & Ethylbenzene, EPA Method 8020 EDS = Ethylene Dibromide, EPA Method 504 Modified TL = Total Lead, EPA Method 6010 For each of the excavation bottom samples collected, either the backhoe or the onsite excavator - was used to remove the tank bottom sands and collect a scoop of native soil which was encountered on an average of 16 feet beneath the ground surface The bucket containing the native soil was returned to the surface and the uppermost 2 feet of soil in the bucket was removed Then a clean 2'x 6'x 6' stainless steel tube was hand driven into the exposed sal for the collection of the sample The tube, once filled, was sealed with aluminum foil and plastic end caps The end caps were secured with elastic tape The sample was then labeled accordingly an stored first in _ a Ziplock° plastic bag and then was placed in an insulated cooler on ice for shipment to the analytical laboratory The soil samples collected from the soil stockpiles were composite samples which were collected from two distinct locations within specified areas of the stockpile The locations were first selected, then the uppermost 18 inches of soil was removed The sample collection stainless steel tube was then hand driven into the exposed soil so that the tube was filed approximately 50 percent Then a section of aluminum foil was placed over the and while the tube was moved to the second composite sample collection location where the process was repeated to fill the tube Once filled, the tube was sealed, labeled and stored as described above 4