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' Phase H Site Assessment Workplan/Health and Safety Plan October 1996 <br /> for the Lodi RaiUMultimodal Station Project No. E168-1 <br /> to the dry cleaning facilities located along Sacramento St., the possibility can not be <br /> eliminated. <br /> 4) Possible maintenance of railroad equipment at the southwest corner of East Elm and <br /> North Main Streets was revealed in historic aerial photography. There may be a <br /> potential for near surface hazardous wastes to migrate beneath the Site from this <br /> possible maintenance area. <br /> 5) A petroleum product pipeline operated by Santa Fe Pacific Pipelines traverses the <br /> ' eastern edge of the Site. An industrial waste line is reported to be located below <br /> Sacramento Street adjacent to the western edge of the Site. Known leaks or releases <br /> from these lines have not been reported. <br /> 6 A magnetic and electromagnetic survey of the Site indicates numerous subsurface <br /> anomalies that do not appear to be associated with known structures on the site. <br /> ' Magnetic information is used to map objects that contain iron or other buried objects <br /> that may exhibit magnetic susceptibility contrasts. The electromagnetic survey <br /> measures apparent ground conductivity and will respond to conductive objects (such <br /> ' as pipelines and UST's) and in some cases backfilled trenches. Figures 4 and 5, Maps <br /> of Geophysical Anomalies of Interest, show the location of anomalous features <br /> identified from this survey. `fable 1, Tabulation of Geophysical Anomalies, provides <br /> ta short description of each identified anomaly. <br /> Excavation and Drilling <br /> Soil excavation, drilling, and sampling is proposed at the approximate locations shown on <br /> Sheets 1 and 2. These trenching and boring locations may require minor modification in the <br /> ' field due to progressive findings, utilities. and physical barriers. Backhoe excavations are <br /> expected to be excavated to depths of L to 4 feet and are intended to expose unknown <br /> subsurface facilities (abandoned fuel tanks, oil sumps,abandoned pipelines, and or scrap metal <br /> is anticipated) for positive identification. If shallow contamination of soil is observed, soil <br /> samples will be collected for analysis. <br /> Augured borings will be drilled using 8-inch diameter hollow-stem augers. Cuttings will be <br /> continuously logged by a registered geologist or civil engineer in accordance with USCS <br /> classification and any anomalous features will be noted. Driven soil samples will be obtained <br /> at approximate intervals of 5 feet unless observations(such as contamination) suggest different <br /> intervals. Cuttings and samples will be screened with a AID. Borings will be backfilled with <br /> a cement-bentonite grout. <br /> ' Trenching and drilling is expected to occur concurrently with approximately 1 day for <br /> trenching and 3 days for drilling. Trench spoils will be placed and tamped back into the <br /> excavation. Drilling spoils will be placed in steel 55-gallon drums, labeled, capped, and <br /> stored on a remote portion of the site until further characterization of soil cutting <br /> contamination, if present, is completed. Following laboratory analyses of soil samples, <br /> ' cuttings from borings showing no contamination will be spread in soil areas on-site. Cuttings <br /> 3 <br /> LESPANA GEOTECHNICAL CONSULTING <br />