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3.6 Removal Activities <br /> Figures 6 and 7 depict the two impacted areas requiring excavation. These areas have been <br /> predetermined based upon the previous delineation but may be readjusted based on the results <br /> from the hand auger sampling described above. Excavation #1, the southern excavation, is 10 <br /> feet by 50 feet with a small 10-foot by 10-foot extension on the east edge. Excavation #2, the <br /> northern excavation, is 10 feet by 111 feet. Excavation #2 is approximately 220 feet north of <br /> Excavation #1. Both excavations are centered upon the railroad track. The depth of all <br /> excavations will be 4 feet bgs. <br /> Railroad tracks are comprised of several parts: rail, joint bars, tie plates, bolts, spikes, rail ties, <br /> and ballast. The rail is attached to each rail tie with a tie plate and spikes. The ballast is the <br /> stone base, approximately 1 to 2 feet deep beneath the bottom of the ties. The rail tracks will be <br /> disconnected at the joints in 10-foot sections and removed with the ties, spikes, and plates still <br /> attached except for the rodding ties which will be removed during the lifting of the sections of <br /> the rails. If the joints do not disconnect, a demolition saw will be utilized to cut the track. The <br /> tracks, salvageable ties, plates, and spikes will be strapped to the excavator bucket and lifted and <br /> placed adjacent to the neighboring tracks. Unsalvageable railroad ties, plates, and spikes will be <br /> placed in the staging area on a 20-mil plastic liner, segregated from the other materials. The <br /> staging area will be located across Humphreys Drive. At the end of each workday, the piles will <br /> be covered with plastic liner, anchored with used railroad ties. <br /> Railroad ties that are unsalvageable will be tested for pentachlorophenol and creosote by TCLP <br /> (toxicity characteristic leaching procedure) and disposed accordingly. A core sample from the <br /> individual ties will be removed and sent to a laboratory for analysis. <br /> Rough&Ready Island 17 Tetra Tech,Inc. <br /> Revised Draft Work Plan November 18, 1998 <br />