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7) In at least one boring, ASE will collect a soil sample from each <br /> significantly different unit and will submit these samples to a <br /> geotechnical laboratory for analysis for permeability, porosity, bulk <br /> density, moisture content and organic carbon content <br /> 1) ASE will drill borings east and west of the line of recovery wells on <br /> the northern portion of the property (Figure 5) These borings will <br /> be used to define the extent of contamination west of RW-I and east <br /> of RW-5 and to verify that the capture zone of the existing <br /> remediation system extends past areas containing any significant <br /> contamination These borings will be drilled with a Geoprobe to a <br /> depth of approximately 19-feet bgs One soil and one groundwater <br /> sample collected from each boring will be analyzed for TPH-G, BTEX, <br /> seven oxygenates (including ethanol and methanol) and the lead <br /> scavengers 1,2-DCA and 1,2-EDB by EPA Method 8260, and TPH-D by <br /> modified EPA Method 8015 If any significant contamination is <br /> present in any of these borings, then additional borings will be <br /> drilled along the northern recovery well transect until the extent of <br /> contamination is defined <br /> ASE will prepare a report presenting results of this assessment Prior t o <br /> writing this report, however, ASE will discuss with the San Joaquin County <br /> PHS-EHD whether additional work, such as additional video/cement bond <br /> logs or CPT borings, should be performed prior to the report preparation <br /> This may allow for a more comprehensive report to be completed <br /> reporting on all similar activities at the end of the field operations, and <br /> will avoid the preparation of potentially unnecessary reports The report <br /> will be submitted under seal of a California registered geologist This <br /> report will include the following <br /> 1) This report will include maps showing boring locations for all <br /> borings and monitoring wells drilled to date as well as other relevant <br /> features such as UST and domestic well locations Maps included in <br /> the report will also show hydrocarbon isoconcentration contours, <br /> groundwater flow rose diagrams, and geologic cross-section <br /> locations <br /> 10 2) Geologic cross-sections will be prepared across each transect as well <br /> as across the downgradient axis These geologic cross-sections will <br /> Frank's One Stop Workplan — December 2000 <br /> -11- <br />