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WORKPLAN FOR PLACING SOIL BORINGS FOR DELINEATION OF HORIZONTAL <br /> AND VERTICAL EXTENT OF CONTAMINATION. <br /> As a result of the laboratory analyzes, it was apparent that <br /> further investigative work was warranted. After extensive <br /> discussions with the owners of the property, and due to space <br /> constraints, it was decided that sail borings would be the best <br /> method of determining the extent of the contamination without <br /> disrupting operations at the facility. Future work will depend <br /> upon the results obtained from the borings. <br /> NOTE: The small amount of clean soil presently stored on the site <br /> will be returned to the north end of the excavation. The contam- <br /> inated spoil has been recharacterized as required by Forward , <br /> Inc. , and has been accepted for disposal . It will be transported <br /> to that facility prior to initiation of the following workplan. <br /> All laboratory test results and proper documentation will be <br /> included in the PAR which will be prepared after this stage of <br /> investigative work is completed. <br /> WORKPLAN: <br /> • 1 . Osterberg & Stewart auger rig will be utilized for this work. <br /> It will be equipped with sufficient hollow-stem auger flights to <br /> complete each baring without steam cleaning. The application for <br /> the drilling permit, together with a check in the amount of <br /> $e9. 00, is attached to this report. <br /> ?_ Soil sampling equipment will consist of either a California <br /> Modified split spoon sampler or wireline operated continuous <br /> sampling equipment; both methods are designed to hold the <br /> standard metal tubes for obtaining discreet soil samples for <br /> analysis. <br /> 3. Five (5) auger-holes will be placed approximately as shown on <br /> Plate VIII;, they will be advanced to a maximum depth of 45 feet <br /> bg l , (highest water level , ) or until all evidence of contamina- <br /> tion is gone. <br /> 4. Soil samples will be taken at five (5) foot intervals from <br /> 10 ' to the deepest depth penetrated, sampling frequency may vary <br /> depending upon field observations and type of sampling equipment. <br /> 5. Samples will be described, sealed, labeled and logged by the <br /> RG, and transported under chain of custody to FGL laboratory for <br /> analysis. <br /> 6 <br />