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I Sampling locations will be located at various points on the shoulder median areas where excavation and clearing/grubbing is expected to occur. A total of 7 borings will be advanced. The approximate boring locations are depicted on the boring location map, Figure 2. Geocon will provide traffic control in accordance with Caltrans Standard Traffic Plan T-10. Each boring will be advanced to a maximum depth of approximately 4.5 meter (16 feet) below the ground surface (bgs) utilizing direct push sampling techniques. Soil samples will be collected from each boring at the surface and from depths of 0.3 meters (1 foot), 0.6 meter(2 foot), 1.5 meter(5 foot), 3 meters (10 foot), and 4.5 meters (15 foot)bgs. The soil samples will be retained in the acetate liner from the direct push sample barrel. Each end of the tube will be capped, labeled, placed in a container; and transported to ATL using standard chain- of-custody documentation. The sampling equipment will be decontaminated between each boring by being washed with an Alconox solution followed by a double rinse with distilled water. The borings?--- w`i114be backfilledr.itll soil ciiftiligs.3"` AT:rimble Pro-XR Global Positioning System (GPS) unit will be used to obtain a coordinate for each boring location. An electronic copy of the data will be given to the Caltrans Contract Manager in .xls format in California Stateplane Coordinate System for the appropriate zone; in meters. Laboratory Analyses The following laboratory analyses will be performed on a.normal turn-around-time. • All soil samples will be analyzed for total lead following Env.ironlnental Protection Agency (EPA) Test Method 6010; • Ten percent of the soil samples, chosen at random, will be analyzed for soil pH following EPA Test Method 9045: • Soil samples that exhibit total lead concentrations greater than 50 and less than 1000 mg/kg will be analyzed for soluble lead via the WET: • Soil samples that exhibit soluble lead (WET) concentrations greater than 5.0 :mg/l or total lead greater than 350 mg/kg will be re-analyzed for soluble lead via the WET using deionized water as the extractant(WET-DI); and • Soil samples that exhibit total lead concentrations greater than 1,000 :mg/kg will be analyzed for soluble lead via the TCLP. Project No.ES 100-06-03 -3- September 4,2001