ARCHIVED REPORTS XR0010164 - Laserfiche WebLink

Home Browse Search

3 3 Soil Sampling Soil samples were collected along the excavation limit and for off-site disposal Previous soil samples were collected in the excavation area prior to the work for soil disposal characterization. This enabled Wright to select a landfill and meet their requirements as discussed above All sampling equipment and sampling tools were cleaned prior to and between each soil sampling The samplers or clean brass liners were advanced into the soil in the excavation or in soil brought to the surface by the excavator or backhoe The exterior soil was brushed aside and the sampler or brass liner was driven into the soil completely filling the liner The sampler or liner was retrieved and the soil filled liners, if retained for chemical analysis, were sealed with Teflon® paper or foil and plastic end caps, labeled, logged onto chain-of-custody forms and place in a chilled ice chest on crushed ice maintained at approximately 4 degrees Celsius for transport to the laboratory Soil samples were collected from the limits of excavation at the approximate top of the capillary fringe (depending upon location, the depth vaned from 10 feet to about 11 feet), and near the existing pipelines. Soil was classified using the Unified Soil Classification System under the supervision of a registered geologist Additional lithologic information was locally collected to describe the subsurface geology 3 4 Groundwater Sampling Groundwater entering the excavation pits was sampled using the collection procedures as follows. Depth to groundwater measurements in the pit were made to the nearest tenth-of one foot from the surface grade, and also checked for the presence of separate phase product. Two instances of light sheen were observed on the water adjacent to areas of coarse-grained sediment in the vicinity of soil sample locations Nos 6 and 15, under the irrigation pipeline The water entering the pit was sampled from the pump discharge at in-line petcocks The petcocks were opened and the water was carefully poured into the appropriate laboratory prepared container with minimum cavitation Each water sample was labeled, logged onto a chain-of-custody form, and placed in a chilled ice chest chilled to 4 degrees Celsius for transport to the laboratory 4.0 Chemical Analysis A total of 29 excavation soil samples and six excavation pit groundwater samples from the excavation work were chemically analyzed at Kiff Analytical, LLC a state-certified laboratory in Davis, California. The samples were analyzed for the following, Total Petroleum hydrocarbons as Gasoline (TPHG), Benzene (B), Toluene (T), Ethyl benzene (E), Xylene (X), Methyl-tert-butyl-ether (MTBE), and five fuel oxygenates tert-Amyl- Methyl-Ether, Ethyl-tert Butyl-Ether, Di-Isopropyl Ether and tert-Butyl Alcohol, Ethanol and Ethylene Dibromide using EPA Methods and 8260B The analyses were run on a "normal" turnaround (five to ten working days) and the analytical reports are attached to this report(see Tables 1 and 2 and Appendix B) Page 6 of 13