WORK PLANS - Laserfiche WebLink

Home Browse Search

The procedures that will be used for drilling the borings and collecting soil samples are presented below. • A standard encroachment permit will be obtained from Caltrans. Drilling and Soil Sample Collection • Approximately 60 soil borings along State Route 120 will be advanced and sampled at depths of 0.1 meters (0.33 feet), 0.3 meters (1.0 feet), and 0.6 meters (2.0 feet) bgs, respectively by direct-push sampling equipment. • Approximately 3 groundwater samples shall be collected. The top 0.6 meters of soil shall be analyzed for lead using the aforementioned sampling interval. The lithology will be logged for each boring at 2 feet intervals and groundwater samples shall be collected in their proper containers. The holes will be backfilled with a bentonite seal. • Soil samples collected using direct push methods will be retained in plastic baggies. • Any soil that is not retained for laboratory analysis will be used as backfill. • The drilling, hand augers and sampling equipment will be washed in a detergent rinse, two clear water rinses, and a final deionized/distilled water rinse prior to drilling. Any wastewater generated by washing the equipment will be disposed of into the soil in the right-of-way or adjacent to the nearest borings. Sample Retention and Analysis • All samples will be placed on ice in an insulated chest cooled to a temperature of approximately 4 degrees Celsius. • Chain of custody procedures, including the use of chain of custody forms, will be used to document sample handling and transport from collection to delivery to the laboratory for analysis. • The samples will be retained in the insulated chests preserved with ice overnight in the custody of an IT employee. The samples will be picked up within approximately 48 hours of collection by a courier supplied by the laboratory, shipped to the laboratory, or will be delivered to the laboratory by IT personnel within approximately 48 hours of collection. The samples will be transported to the laboratory in a motor vehicle. • Soil samples will be labeled with the route number, boring number, and the sample collection depth. For example, "120-1-0.1" represents the first boring (1) along State Route 120 collected at a depth of 0.1 meters below the ground surface. • Laboratory quality assurance/quality control procedures are summarized below: