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Remediation Report - 152 East 11 th Street, Tracy, California Page 10 were cut off close to the back of the East 11 th Street sidewalk and capped in compliance with the requirements of the City of Tracy The locations and depths of the cut off laterals are noted on Figures 2 and 5 Discovery and Removal of Waste-Oil Tank On February 13, 1996, shortly after remedial excavation had begun, a 550-gallon, underground, waste-oil tank was encountered when a ramp was being formed to provide access to the contaminated soil at depth beneath the site The presence this tank in the subsurface had not previously been suspected Its location is noted on Figure 2 Permits to remove the tank were obtained from the City of Tracy and the SJCPHS on February 14 On February 15, under the oversight of a representative of the SJCPHS, the tank was inerted, removed and shipped for cleaning and destruction at a permitted facility Samples recovered from the bottom of the tank pit, also in the presence of the SJCPHS's representative, were shipped for testing at a Chromalab Inc 's laboratory in Pleasanton California that is Iicensed by the California Environmental Protection Agency (CEPA) to perform the requisite analyses The samples contained no detectable concentrations of any analytes of concern Copies of the documentation related to the removal of the waste oil tank are compilled in Appendix D Discovery of Piping Leading to Off Property Location During the progress of early stages of the excavation operations an array of four pipes running in parallel and leading to an off-site location under East 11th Street was discovered in the subsurface in the northern portion of the site The pipes had, at some time in the past, been cut off at a point some five feet south of the back of the sidewalk along East 1 i th Street When they were pulled from the ground, their length and geometry indicated that they had terminated at a point approximately 10 feet beyond and to the north of the I52 East 1 Ith Street property line and close to what is now the curb- line on the south side of East I 1 th Street The type, diameter and fittings of the lines described above were typical of those used as fill, discharge and vent lines for underground fuel-storage tanks Because such lines are plumbed into the top of a tank, when a tank is removed from the underground it is necessary to either remove such piping or bend it out of the way to permit the tank to be raised from beneath them In this case there was no sign that the ends of the pipes had been cut or broken at the their northern ends prior to the time they were pulled from the ground by the excavator and they were not bent at that end as would be expected if they had been pulled aside to permit removal of the underground storage tank to which they had evidently been attached }