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+-� United States Postal Service %NO' Stockton""de Maintenance Facility <br /> Mr. Rollo Stephenf with Ramcon Engineering and Environmental Contracting, Inc. was <br /> ;r contacted to determine the protocol utilized to abandon the underground motor oil <br /> and waste oil underground piping that was left in-place. Mr. Stephenf indicated that <br /> the underground piping was triple rinsed, cut, and capped. <br /> V <br /> The SJCEHD requested that the USPS delineate the extent of documented <br /> contamination at the site and investigate the areas previously not "properly" <br /> t. addressed during the underground storage tank (UST) removals. In addition, the <br /> SJCEHD requested submittal and performance of a closure plan for the underground <br /> piping associated with the motor oil and waste oil USTs that was left in-place beneath <br /> the VMF. <br /> 1.3 Scope of Work <br /> The scope of work for this study was outlined in our agreements dated September 23, <br /> 1999 and April 5, 2000 and included the following tasks: <br /> V Drilling and logging of four exploratory borings to further evaluate soil quality <br /> beneath the four USTs, diesel fuel dispenser, and dispenser conveyance piping. <br /> V Coring and hand sampling of three exploratory borings to evaluate soil quality <br /> beneath the in-place conveyance piping associated with the waste oil and new <br /> oil USTs. <br /> V Collecting soil samples for laboratory analysis. <br /> 2.0 SOIL QUALITY EVALUATION <br /> 2.1 Subsurface Investigation <br /> V <br /> On April 17 and 18, 2000 and under the supervision of Principal Engineer Stason <br /> Foster, environmental engineer Ryan Gerber directed a subsurface exploration <br /> �. program and logged four exploratory borings (EB-1, EB-2, EB-3, and EB-5). Borings <br /> EB-1, EB-3, and EB-5 were located approximately 9 feet from the former UST <br /> excavation and were advanced at an angle of approximately 30° from vertical to <br /> collect samples from beneath the concrete anchor slabs of the USTs. The borings <br /> were advanced to a vertical depth of approximately 26 feet. Boring EB-2 was located <br /> approximately 9 feet from the dispenser conveyance piping and similarly angled. <br /> Samples from this boring were collected from beneath the dispenser conveyance <br /> piping and from beneath the diesel fuel dispenser. <br /> Furthermore, to evaluate soil quality beneath the left in-place conveyance piping <br /> associated with the waste oil and new oil USTs, environmental engineer Ryan Gerber <br /> sampled three exploratory borings (S-1, S-2, and S-3) near the underground waste oil <br /> and new oil piping. A private utility locator was utilized to attempt to locate the <br /> underground piping; however, the locator's attempt were unsuccessful. The boring <br /> locations were selected based on the provided facility drawings (see Figure 2). The <br /> boring locations were cored and hand sampling equipment was utilized to collect <br /> samples from approximately 2 feet beneath the piping. <br /> LOWNEY ATS Page 2 <br /> Environmental!Geotechnical/Engineering Services 664-76 <br /> V <br />