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AEI Project No. 353448 <br />January 29, 2016 <br />Page 3 of 5 <br />Drilling and Sample Collection <br />The scope of work proposed consists of drilling and logging twelve (12) soil borings (B1 through <br />B12) at the property (Figure 2). The selected drilling contractor will hold a State of California C- <br />57 driller's license. <br />The purpose of each boring is listed below: <br />Boring B1 will be located adjacent to surface staining in the waste oil storage area. <br />Boring B2 will be located adjacent to the northwest side of the retention pond. <br />Boring B3 will be advanced in between the southwest end of the retention pond and the <br />aviation fuel AST. <br />Boring B4 will be advanced adjacent to the aviation fuel AST and southwest of the sulfur <br />dust pile. <br />Boring B5 will be advanced adjacent to the surface staining by the hazardous materials <br />shed. <br />Boring B6 will be advanced adjacent to the surface staining within the hangar. <br />Boring B7 will be advanced within the new pesticide container storage area, near the <br />southern corner of the hangar. <br />Boring B8 will be advanced within the new pesticide container storage area and near the <br />southwest end of the office building. <br />Boring B9 will be advanced within the empty pesticide container storage area. <br />Boring B10 will be advanced within the empty pesticide container storage area, adjacent <br />to the pesticide mixing/vehicle washing area. <br />Boring B11 will be advanced adjacent to the drain within the pesticide mixing/vehicle <br />washing area. <br />Boring B12 will be advanced adjacent to the 100-gallon gasoline AST, located south of <br />the pesticide mixing/vehicle washing area. <br />The borings will be advanced with a truck-mounted direct-push drilling rig. The borings will be <br />advanced to a depth of 5 feet bgs except for Boring B11, which will be drilled to a depth of 7 <br />feet bgs or to first encountered groundwater, whichever is shallower, for the collection of soil <br />and/or groundwater samples. Soil in the borings will be continuously collected in liners within <br />the sampling barrel from which a 6-inch sample will be collected at appropriate depths. Soil <br />samples will be collected at selected intervals or at a change in lithology whichever is first. <br />The samples will be sealed with Teflon tape and plastic end caps. The soil borings will be <br />logged using the Unified Soil Classification System. A photo ionization detector (PID) will be <br />used to screen soil samples in the field and the PID readings for each sample will be included <br />on the boring logs. Groundwater (if encountered) will be collected in laboratory supplied <br />containers.