WORK PLANS - Laserfiche WebLink

Home Browse Search

Margaret Lagorio • • Page 2 February 23, 1996 Scope of Services CH2M HILL proposes to drill and sample 10 separate locations that have the potential for revealing impacts to the subsurface soil as a result of the canning operations. Borings B-1 through B-9 will be located in the areas identified by Park. Boring B-10 will be located at the former location of the Draw Press. Table 1 specifies the boring identification number and the corresponding location. Drilling and Sampling All borings will be prebored through the concrete floor by a concrete cutting subcontractor. Once the concrete is precut, a direct push drill rig will line up over the precut hole and push a sampling device to 5 feet below the concrete surface. The direct push method will minimize the drill cuttings and subsequent volume of material to be disposed. One sample will be collected from each boring at either 5 feet or where contamination appears to exist based on visual and/or field screening instruments. If visual or field-screening observations indicate that soil contamination extends beyond 5 feet below ground surface, CH2M HILL will advance the boring an additional 2 to 5 feet to attempt to determine the extent of contamination. If further boring advancement is necessary beyond 10 feet below ground surface, C112M HILL will contact Del Monte to discuss scope and budget modifications. The sampling device is a 2-inch diameter modified California split spoon sampling device equipped with brass liners. The soil will be collected in the brass liners as the sampling device is pushed into the soil. Samples will be selected for submittal to the laboratory. Hand-augered soil borings (B-4, B-5, and B-10) will be advanced using hand-auger drilling equipment. Discrete sampling intervals will be sampled using an impact sampler. The impact sampler will be driven into the soil at the desired depth. The sampling chamber of the impact sampling device will be lined with brass liners. After a soil sample is collected in brass liners, the liners will be capped with Teflon tape and subsequently covered with plastic end caps. The samples will be appropriately labeled with the boring number designation, depth, time, and date. These samples along with the appropriate chain-of-custody documentation will be shipped to a state-certified laboratory for analysis. The analysis will be performed on a regular turnaround time basis which is typically two weeks. Table 1 summarizes the analyses to be performed on the samples. Sufficient sample volume will be collected from each boring to perform the necessary analyses listed in Table 1. Soil cuttings and soil samples will be logged on-site by a CH2M HILL hydrogeologist under the direct supervision of a California-registered geologist. The soil cuttings will be logged according to the Unified Soil Classification System. Once the sampling is complete the borings will be grouted to the surface using Portland neat cement. c:\mywork\delmonw\plmt33\silgm.doc