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SCOPE OF WORK <br /> 1_0 Environmental Assessment <br /> The environmental assessment will include collection of soil and groundwater samples from <br /> locations both outside and within the footprint of the fill area as well as a methane barhole survey. <br /> Push probe sampling techniques area proposed for areas outside the fill area. Given the possibility <br /> of encountering fill materials which would preclude use of push probe sampling techniques, it is <br /> proposed that soil and groundwater sampling within the footprint of the fill area be performed using <br /> hollow stem auger drilling methods as part of the geotechnical investigation. <br /> Five (5) push probes will be completed outside the footprint of the fill area to depths of <br /> approximately 20 feet or refusal. One {1) push probe will be completed near the mid-point of the <br /> east and south sides of the former aggregate pit. Based on regional groundwater flow to the west- <br /> narthwest, two (2) push probes will be completed at the approximately mid-point of the north and <br /> west sides of the fill area and one push probe will completed near the northwest comer of the fill <br /> area. The primary purpose of the push probes is to allow for collection of groundwater samples. <br /> Up to frve (5) additional angered soil borings will be completed within the footprint of the fill area as <br /> part of a geotechnical investigation. Materials obtained from these borings will also be inspected <br /> and screened as part of the environmental assessment. <br /> A methane survey will also be conducted at 10 or more locations within and surrounding the fill area. <br /> Prior to installation of the push probes or angered borings, B68A will mark the proposed push probe <br /> locations and request a utility check for identifying buried utilities within the investigation area. <br /> BB&A will also consult with on-site personnel knowledgeable of on-site utilities and subsurface <br /> obstructions prior to subsurface exploration. <br /> 1_1 Soil Sampling <br /> For push probe soil samping, soil samples will be retrieved using "macro-core° sample collection <br /> equipment, a type of sample collection tooling which allows for retrieval of continuous cores of <br /> subsurface materials in plastic liners approximately four {4) feet long by one (1) inch in diameter or <br /> five (5}feet long by 1.6 inches in diameter, advanced with a Model 5400 or Model 6600 Geoprobe®. <br /> No additional soil materials are generated by this technology (i.e., all soils are contained within the <br /> soil liners). For the angered soil borings, soil samples will be obtained from split-spoon samplers. <br /> Subsurface materials encountered during completion of the push probes will be recorded on a probe <br /> log. Soil materials in the macro core liners will be inspected for the presence of contamination by <br /> visual inspection and field instrument monitoring using a photoionization detector. The nature of the <br /> soil materials will be logged during probing/drifting to document the geologic unit(s) present and <br /> other observable features. <br /> COE481SC.OSW -PROPOSAL PAGE 2 <br /> FIELO INVESTIGATIVE SERVICES FOR ENVIRONMENTAL AND GEOTECHNICAL ASSESSMENT OF FORMER GRAVEL EXTRACTION SITE <br /> <br /> AUGUST 24, 2007 <br /> <br />