WORK PLANS - Laserfiche WebLink

Home Browse Search

location is presented in Table 1. As shown in Table 1,the proposed locations for soil sampling are in agricultural areas,near a railroad crossing,and near drainage from agricultural areas outside of the proposed alignment.The proposed sampling locations represent areas along Alignment 2 with the highest potential for encountering hazardous constituents in soil based on land use.The portions of the alignment not selected for soil sampling, for the most part,appear to be open country with no obvious indication of agricultural activity or other industrial activity.Therefore,soil in these areas is not likely to contain hazardous constituents. Borings will be drilled and sampled by Pitcher Drilling Company under the supervision of an OCC engineer. The borings will be logged at 5-foot depth intervals in accordance with the Unified Soil Classification System.A total of three soil samples will be collected from each boring. Soil samples will be collected in 6-inch-long,2-inch-diameter stainless-steel liners at approximately 0.5 foot,7.5 feet, and 15 feet below ground surface(bgs).The liners will be placed in a 2-i/2-inch-inner-diameter Modified California Sampler.At the required sample depth,the sampler will be driven into soil at the bottom of the boring using a 140-pound hammer. Blow counts will also be obtained for geotechnical purposes. The ends of the liners will be covered with Teflon-lined plastic end caps. Environmental sampling will be terminated at approximately 15 feet bgs. All samples will be stored in a cooled container and delivered to EBMUD's laboratory under chain-of-custody control within 24 hours of collecting the samples. A partially completed chain-of-custody form is included as an attachment. Upon reaching the targeted depth,the boring will be backfilled to ground surface with neat cement grout. Drilling equipment will be steam-cleaned before drilling and between borings to reduce the potential for cross contamination. Handling and disposal of soil cuttings are discussed in Section 3.4. 3.3 Task 3: Perform Laboratory Analysis At the laboratory, soil samples from the same boring will be composited into one sample. A total of eight composite soil samples will be analyzed for the following constituents: • Volatile organic compounds (VOCs) using U.S.Environmental Protection Agency (EPA)Method 8240 • Semivolatile organic compounds(SVOCs)using EPA Method 8270 • Total petroleum hydrocarbons as gasoline(TPHg)and benzene,toluene, ethylbenzene,and xylenes (BTEX)using EPA Method 8015 modified • Total petroleum hydrocarbons as diesel (TPHd) using EPA Method 3510/3550 • Polychlorinated biphenyls (PCBs)and pesticides using EPA Method 8080 • Total recoverable petroleum hydrocarbons TRPHs using EPA Method 418.1, and • California Code of Regulations (CCR)metals,including hexavalent chromium, using EPA 6000/7000 Series. Chemical analysis will be performed by EBMUD's laboratory. The EBMUD laboratory is a California-certified laboratory. SFOIFOLSAMPL.DOC 3