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� r _ KLEINFELDER Task 2 - Drilling and Installing One Monitoring Well A single boring will be drilled to a depth approximately 10 to 15 feet below ground water, which is currently estimated to be at a depth of 30 feet in the area. The boring will be placed at a downgradient location as determined from the file review. If the gradient cannot be estimated, three borings will be triangulated around the excavation (proposed boring locations are shown on Plate 1). The soil boring will be advanced using a truck-mounted drill ng equipped with S-inch hollow stem augers The boring will be drilled, logged, and sampled following the protocol described in Attachment A, Sections A-2 1 through A-2 4. Soil samples will be collected from the boring at 5-foot intervals for logging purposes and potential chemical analysis if required in the future At this time, soil samples will be qualitatively screened in the field with an organic vapor analyzer, but not submitted for chemical analysis. A 2-inch well will be constructed in the boring, as described in Attachment A, Section A-3 1. Task 3 - Well Development and Sampling Twenty-four to 48 hours after installation, the well will be developed to remove sediment- laden water and to increase the hydraulic radius of the wells Development will be performed as described in Attachment A, Sections A-3.2 through A-3.3 After the well is developed, Kleinfelder will collect a sample from the well. The well will be purged and the sample collected as described in Attachment A, Section A-4 2 Because there is a single well, the well will be developed and sampled on the same day Normally, a well is developed and sampled on separate days, but since it is a single well, it will be more cost effective to sample on the same day Additionally, SJCPHS will be requiring a second round of sampling. Task 4 - Laboratory Analysis Initially, one water sample will be submitted under chain-of-custody to Superior Precision Analytical, Inc., in San Francisco. This laboratory is certified by the California Department of Toxic Substances Control for the proposed analyses. The sample will be analyzed for• ► Total Petroleum Hydrocarbons Extractable (Diesel) ► Total Petroleum Hydrocarbons Purgeable (Gasoline) Benzene, Toluene, Ethylbenzene, and Xylenes The sample will be analyzed on Superior's regular turnaround schedule, usually requiring 5 working days for completion When the second round water sample is collected, it too will be submitted to Superior under the same procedures and analyzed for the same constituents Task 5 - Prepare Report of Findings Upon completion of the ground water sampling and receipt and review of analytical results, a report of findings will be prepared for client review The report will include. IN. A description of field activities, observations, and protocols FWP2-92-23 Page 2 of 3 Copynght 1992 Klemfelder, Inc