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WHC-SD-EN-TI-136, Rev. 0 excavation were located. Samples were again taken from the bucket of the backhoe. No indication of tank leakage or petroleum contamination were found by the FTL at the time of tank removal. Analytical results from samples were below action levels (See Table 2). 5.0 100-N-SS-27 AND 100-N-SS-28 Tank 100-N-SS-27 was taken out of service on June 22, 1990 because of a failed tightness test conducted the day before. Twenty- four-hour notification was made to the Department of Energy (DOE) Richland Operations Office (RL) and Ecology per 40 CFR 280.61, and an Event Fact Sheet (#D&D/10O-10-90) was prepared as well. Tank excavation was initiated on December 13, 1990, in accordance with 40 CFR 280.71. Immediately following tank removal on December- 18, 1990, soil sampling was implemented. Field screening procedures consi sted of collecting approximately 1/2 cup of soil, placing the soil in a plastic bag, and sealing by twisting the top, including as much air as possible. The plastic bag was then shaken for approximately 10 seconds and the OVM probe was inserted in the bag for a reading. This procedure will be referred to as the OVM bag technique. Field screening using the OVM bag technique revealed organic vapor concentrations greater than 200 ppm in the south end of the tank impression. Additional field screening between 100-N-SS-27 and the sister tank (100-N-SS-28), which were about 2.7 m (9 ft) apart, showed vapor concentrations up to 350 ppm. Tank 100-N-SS-27 was noted to be in very good condition with no observable holes; however, the discovery of petroleum product in the excavation initiated an Unusual Occurrence Report (RL-WHC-WHC600EM-1990-0337). It was believed at that time that the contamination was from occasional overfilling of the tanks and a reported release of 337 L (89 gal) of gasoline on January 18, 1988 (Unusual Occurrence WHC-00-88-004-R,D&EO-1). The gravel and porous backfill surrounding the tan ks may have created a natural pathway for surface spills. Samples were collected for offsite laboratory analysis (Figure 4). Analytical results from soil sampling indicate that the contaminated soil from the tank excavation site i s well above cleanup levels set by the WAC 173-340-745 codes. Therefore, continued cleanup action was determined to be necessary. On January 11, 1990, excavation of contaminated soil resumed. An additional 0.6 m (2 ft) of soil was removed, making the total depth about 4.3 m (14 ft), before reaching the excavation limit of the backhoe. Field screening using the OVM bag technique revealed elevated levels of volatile organic vapors ranging from 200 ppm to 350 ppm. There was no indication that the lower limit of contamination had been reached. The contamination was believed to extend south under the neighboring tank, 100-N-SS-28. No sample s were collected at this time for laboratory analysis. It was noted in the 45day report (Correspondence No. 910299) dated January 31, 1992, that complete cleanup would require excavation/removal of Tank 100-N-SS-28. The report al sC3 stated that Tank 100-N-SS-28 would be removed within the next three years, at which time this entire project would be cleaned up or would be included in the 100-NM-i Operable Unit remediation plan. On July 16, 1991, removal and remediation activities of UST 100-N-SS-28 were implemented under WAC 173-360. Soil was excavated from around the tank and background samples were taken (Figure 5). The tank was removed the 8
WHC-SD-EN-TI-136, Rev. 0 Figure 4. Soil Excavation and Sample Collection at Tank 100-N-SS-27 (3.7 m (12 ft] Below Grade Surface). C -C I 0 I~0 0 0A~ I I X (NN V) I 04 1I0 X a)) ) I T) 0 >t U) 04 .0 0 1( U)- I 0 I 00 0 0 I 00 L - ---- I (D I IO I 0I I I I (N I 0I L -- - - J I (I)9 CI 0 0
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P.O. Box 1970 Rfichland. WA 99352 W
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11. Actions Taken (A) or -Planned (
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Analysis A. Semi-Volatiles B. Volat
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MARTIN MARIETTA ENERGY SYSTEMS, INC
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LABORATORY: THA/ARLI WHC-S-EN-TI-13
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5.0 DATA PACKAGE COMENTS: WC-SD-EN-
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Receivedt 615104192 WHC-SD-EN-TI-13
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