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Field Activities • Perform approximately 142 0.6-m direct-push soil borings within the median and shoulders of Route 99. Soil borings will be performed at approximate 250 m intervals, at interchanges, and in any depressed area where runoff may accumulate or ponding may occur. • Perform 49 3-m direct-push soil borings on the shoulders of Route 99 at the proposed sound wall locations. Soil borings will be performed at approximate 50 m intervals. • Collect soil samples from direct-push soil borings using a hydraulically driven soil sampler equipped with an acetate liner. After collection, the soil sample tubes will be capped, labeled, and placed in an ice chest. Soil samples will be collected at approximate depths of 0 to 0.15 m, 0.15 to 0.3 m and 0.45 to 0.6 m below the ground surface (bgs) from the 0.6 m borings, and at approximate depths of 0 to 0.15 m, 0.15 to 0.3 m, 0.45 to 0.6 m, 1.35 to 1.5m, and 2.85 to 3 m bgs in the 3 m borings. The samples will be delivered to Creek for chemical analyses under standard chain-of-custody procedures. Additional samples may be collected at the discretion of the Caltrans Contract Manager. • Perform 30 hand-auger soil borings beneath three bridges within the project boundaries. The hand-auger borings will be advanced to a depth of approximately 0.6 m bgs. Soil samples will be collected from each borehole at approximate depths of 0 to 0.15 m, 0.15 to 0.3 m, and 0.45 to 0.6 m bgs. Soil samples will be collected directly from the hand-auger bucket and placed in laboratory provided glass jars. The samples will be delivered to Creek for chemical analyses under standard chain-of-custody procedures. • Collect approximately thirty bulk samples of potentially asbestos-containing material observed on the three bridges during the site visit. Sample locations will be presented with the final report. The bulk samples will be collected by David Watts, a Cal/OSHA Certified Asbestos Consultant, certification no. 98-2404. Samples will be transported to EMSL under standard chain-of-custody procedures. • Collect approximately thirty samples of suspect lead-containing paint observed on the three bridges during the site visit. Sample locations will be presented with the final report. Paint samples will be collected by a David Watts, California Department of Health Services-certified inspector/assessor, certification no. I-1734. Samples will be transported to Creek under standard chain-of-custody procedures. • Determine the location of each boring using a global positioning system(GPS). The GPS to be utilized during the field activities will have the ability to locate the horizontal position of each boring with an error not to exceed 1.0 m. The GPS will be used to record the position of each soil sampling location using the latitude-longitude coordinate system for the horizontal location, and the North American Vertical Datum 1988 (NAVD 88) coordinate system for the vertical location. • Retain the services of Flash Safety to perform lane closure services during the sampling activities along the Route 99 median and shoulders. • Perform quality assurance/quality control (QA/QC) procedures during the field exploration activities. These procedures will include decontamination of sampling equipment before each sample is collected; and providing chain-of-custody documentation for each soil sample Project No.S8475-06-27 -3- April 3,2002