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AAAA <br /> s <br /> EXCAVATION OF CONTAMINATED SOILS <br /> hin <br /> he area <br /> The excavation of oonen250ogallonated soil undergroundtfuelt <br /> by storage <br /> formerly occupied by 1991 . Using organoleptic analysis, <br /> tank was begun op February 7, <br /> was tracked to a depth of 18 feet bgs. <br /> the contaminant plumeis point <br /> isplade at <br /> signficantvolumeofcontaminateddsoilsdapparently <br /> remained beneath the <br /> sign <br /> 1 ,000 gallon regular gasoline fuel storage tank still in <br /> operation on site. The exterior surface of tnlsanl <br /> ,00a gallon) <br /> rusted and without a sand envelope. <br /> tank was observed to be <br /> While removing <br /> contaminated t <br /> ed soil it the immeThesmall <br /> aof <br /> tank, the backhoe bucknoletthus <br /> et pierced the tank. <br /> atched and the contents °f the tank removed <br /> created was promptly p <br /> to a tanker truck. A permit was acquired from pFIS/EHD and the <br /> tank removed on February 15, 1991 . <br /> collected <br /> om <br /> th each end <br /> One discrete <br /> gallonastoragestank. These rsamples a(designated <br /> of the , <br /> TN-1 and TS-2) were each acquired from a consolidated bloc <br /> of soil brought to grade within the backhoe bucket. After <br /> removing the top two inches of the soil contained within the <br /> bucket, a clean brength)mwasndriven into theinches <br /> soilnuntileithwas <br /> by 6.0 inches in length) upon removing <br /> completely filled with material. promptly P teflon <br /> ns were <br /> sampling tube from the soil, itsanddwrapped~with eblacl;helectrical <br /> pads, fitted with plastic capsr <br /> tape, Fach tube was then marked and placein of <br /> d on blue ice pending <br /> transportation under cha tinezcuCAoda 5taca certifiedlhazardous <br /> Laboratories, Inc. Both samples were analyzed for <br /> waste analytical laboratory. <br /> as Gasoline (TPH-G) <br /> Total Petroleum _11Ydroaarandsethylbanzene (BTX&E);usingeEPA <br /> toluene, total xylenes, and Total Lead using EPA Method 7420. <br /> ' Methods 5030/6015--8020; <br /> Following removal of the 1 ,000 gallon tank, remedial, excavation <br /> was resumed with additional soil removed to a depth of 20 feet <br /> bgs. <br /> Excavation was continued on February 20, 1991 and again on <br /> February 21�, 1991 • • •with a Komatsu PC 30OLC•-3 Excavator equipped <br /> the depth <br /> with asails were eexcavatutilize' <br /> 26 £e <br /> d on depth c�rrc�tbgs-t. On this <br /> date, <br /> at which soils were to be free of detectable levels of <br /> target contaminants. <br /> All contaminated soils crew) xbelieved. ' tohave <br /> ofnsandyvated soil with <br /> the exception of a 1 u ' ( ) <br /> located beneath the pump island at 15 feat bgs. A sample (EC-15) <br /> is area of residual contamination with four <br /> was obtained from th <br /> 2. <br />