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Frontier Transportation, Inc. Well Installation Work Plan November 14, 2006 Page 5 sections will be constructed with flush joining threaded fittings to ensure leak-proof unions. See Figure 3 for the Well Construction Diagram. A filter pack of sand will be placed around the screen to retain the finer grained fractions of formation material and to create a zone of high permeability that allows free entry of water in the well. The pack will consist of clean sand (#2/16). The bentonite and annular seals are I necessary to prevent the annulus from serving as a vertical conduit for potential contaminants. Following placement of the annular seal, a large-diameter flush-mount protective casing will be installed around the well heads. The casing will be firmly seated in concrete and supplied with d lockable covers for security. r - r 5.1) Soil Sampling A total of four soil samples will be collected from each of the three shallow wells. Soil samples will be collected at least at 5' intervals from the boring and at depths where visual or IPID inspection indicates contamination. All samples will be collected in a split spoon sampler lined with 2-inch by 6-inch brass tubes. The bottom brass tube will be immediately sealed with Teflon tape, capped, and packaged in a cooler with ice. The second brass tube will be field screened using a PID to detect volatile organic compounds and used to classify soil sediments. All soil samples that detect petroleum hydrocarbon vapors using a PID or visual inspection will ( be submitted to a California certified laboratory for analysis. All soil samples submitted to the laboratory will be analyzed for TPH-g, BTEX, and MTBE and oxygenates using EPA methods 8015 modified and 8260. �I 5.2) Analytical Methods and Quality Assurance A California Department of Health Services certified laboratory would conduct all chemical analysis of site samples. The chosen laboratory will maintain strict conformance to EPA standard methodologies, quality assurance/quality control (QA/QC) protocols and standard laboratory practices supporting EPA procedures. I � 5.3) Schedule Following acceptance of the work plan by the EHD, on site test activities will commence within sixty days. In the past, subcontractors have been able to schedule drilling within three to four weeks of the initial bid request. Therefore, the drilling subcontractor will be scheduled upon receipt of approval from the EHD so that work may commence as soon as possible. Once the drilling subcontractor has been selected, a well permit application will be submitted to the EHD and Underground Service Alert (DigAlert) will be notified. ' 1