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ameO <br /> 3.0 SAMPLING PLAN <br /> The objective of the proposed investigation is to delineate the extent of affected soil and <br /> groundwater previously identified on the eastern portion of the Tracy Rail Yard site (e.g., <br /> borings TRY-1, TRY-2, TRY-11, and OU2-AO14-S1). To meet this objective, AMEC proposes <br /> to advance four borings (EAST-1 to EAST-4)for the collection of soil and groundwater <br /> samples. Additional locations may be added if further soil and/or groundwater sampling is <br /> required for lateral delineation of impacted soil or groundwater. Proposed sampling locations <br /> are shown on Figure 5. <br /> 4.0 FIELD AND ANALYTICAL METHODS <br /> Prior to drilling, Underground Service Alert (USA)will be notified, the soil boring locations will <br /> be cleared by a private underground utility locator, and appropriate permits will be obtained <br /> from the San Joaquin County Public Health Services, Environmental Health Division. Access <br /> to drill in the City of Tracy streets will be obtained from the City of Tracy (via encroachment <br /> permits). AMEC will prepare a site-specific health and safety plan that will include job loss <br /> analyses for all major work processes to be conducted during field activities. <br /> Soil and groundwater sampling methods, analytical methods, quality assurance/quality control <br /> procedures, and borehole destruction and surveying procedures are described below. <br /> 4.1 SOIL AND GROUNDWATER SAMPLING METHODS <br /> AMEC proposes to advance four borings for the collection of soil and groundwater samples to <br /> delineate the extent of affected soil identified in the eastern portion of Tracy Rail Yard site. <br /> Each boring will be hand augered to a depth of 8 feet bgs to clear for utilities, then advanced <br /> using a hydraulically driven core barrel and drive sampler to the total depth of the boring. A <br /> continuous core of the soil will be collected and examined from each soil boring location and <br /> the lithology will be logged by an AMEC field geologist or scientist under the supervision of a <br /> California Professional Geologist. Soil lithology will be logged using the visual-manual <br /> procedures of American Society for Testing and Materials (ASTM) Standard D 2488 for <br /> guidance, which is based on the Unified Soil Classification System, as described in ASTM D <br /> 2488-06. In addition, organic vapor meter(OVM) readings will be taken and recorded at <br /> various depths. Borings will be advanced to a depth of approximately 25 feet bgs based on the <br /> previously observed depth to groundwater(11 to 21 feet bgs) and the depth of affected soil <br /> (generally observed between 15 to 20 feet bgs in previous borings on the Tracy Rail Yard <br /> site). If impacted soil is encountered, borings will be advanced to 25 feet bgs or until no <br /> evidence of petroleum hydrocarbons is observed in the soil core, whichever is deeper. <br /> AMEC Geomatrix, Inc. <br /> X:\16000s\161130\4000\OffSiteEastWP_061511\1 txt,cvrs,Itrs\text.docx 4 <br />