FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

k'g KLEINFELDER clean pad. For a location of the area see Plate 2 and for a detail map of the excavation area and confirmation soil sampling locations see Plate 3. The excavation of the material, including sump, concrete and soil was conducted by RAH Environmental, in Loomis, California. The soil was stockpiled adjacent to the area onto visqueen prior to removal. Kleinfelder estimates approximately 40 cubic yards of material was excavated from the sump/steam clean area and subsequently removed from the site on April 6 and 7, 2004 to Forward Landfill (Class II landfill) located in Stockton, California. The excavation was backfilled with onsite material located north of the excavation. Manifest records were prepared by RAH Environmental. Copies of the manifest records are located in Appendix C. The excavation was square shaped and measured approximately 12 by 20 feet in area and ranged from 2.5 to 4 feet deep. The deepest part of the excavation was located near the sump area. The excavation included the removal of the sump, adjacent nearby area, and steam clean pad located north and east of the sump. The excavation was extended north and east based on a band of discolored soil noted at a depth of about 1 to 2 feet bgs. Trace amounts of debris including g asphalt, glass, and rubber was noted in this band. Based on the noted depth,this material appears to have been previously sampled during Kleinfelder's previous assessment conducted in October of 2002. Although only a slight organic/petroleum-like odor was noted, discolored soil remained in the northern sidewall of the excavation. k Six confirmation discrete soil samples were collected from within the excavation (see Plate 3). Four were collected from sidewalls and two from the bottom of the excavation. The confirmation soil samples were collected at depths ranging from 1 %2 to 4 feet bgs. The soil samples were collected by slide hammering a 2-inch diameter by 6-inch long stainless steel tube into the soil. Sample Collection and Handlin¢ The stainless sampler and sample tubes were cleaned between locations with a Liquinox® (laboratory-grade detergent) wash followed by a potable water and distilled water rinse. The stainless steel tubes used for collecting the samples were then sealed following collection of the sample with Teflon® sheeting and tight-fitting plastic end caps. After collection, the soil j samples were labeled, logged on a chain-of-custody form, and immediately stored in an iced cooler pending transportation to the analytical laboratory. The soil samples were transported under chain-of-custody control to Kleinfelder's office and then transported by courier in a chilled container to Alpha Analytical Laboratory, Inc. (Alpha) of Sparks, Nevada. The chain-of-custody form was signed by each individual who handled the samples, including the sampler and the receiving employee at Alpha Analytical. Alpha is certified by the State of California to perform the analyses requested. The samples were analyzed on a standard 5 to 10 working day turnaround schedule for completion. t i 42747.T03 /ST04R882 Page 6 of 9 Copyright 2004,Kleinfelder, Inc. July 2,2004