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Workplan For Groundl,�er Monitoring Well Installation And Contin�Quarterly Ground-Water Sampling File 8013-02 July 12, 1999 Page 3 well MW-2 in order to increase the areal coverage of the existing well set, yet be close enough to MW-2 to provide comparative ground-water data for the ground- water contaminant plume. This well will also assist in better defining the extent of ground-water contamination and site-specific ground-water flow directions and gradients. This well will be installed by a licensed C-57 well driller. During drilling, JJW Geosciences will collect soil samples with a split spoon sampler and brass sleeves every 5 feet to a total depth of approximately 20 feet bgs (soil samples collected at 5, 10, 15, and 20 feet bgs). During the advancement of the soil boring, we will monitor the borehole with a hand-held photoionization detector (PID) for volatile organic vapors. We will field test soil samples by making observations of discoloration, noting any ambient odors from the soil samples, and by screening soil samples with a PID. We will cap, label, and store suspect-contaminated soil samples in a cooler prior to delivery under chain-of-custody to a State of California certified analytical laboratory. Soil samples will be analyzed for the following parameters: I. Total petroleum hydrocarbons as gasoline (EPA method 8015 modified); II. The volatile fuel components benzene, toluene, ethylbenzene, and xylenes (BTEX) (EPA method 8020); and, III. Petroleum oxygenates (EPA method 8260 modified). We propose to construct the well of 2-inch diameter, schedule 40 PVC casing. We anticipate installing the well to a depth of 20 feet bgs and having a screened interval between approximately 5 feet and 20 feet bgs. The final well construction details are proposed to be discussed in the field with San Joaquin County prior to the completion of well construction. Consequently, arrangements will be made with San Joaquin County to have a county inspector on- site as the soil boring nears completion. 4. Following completion, we will develop the well to remove drilling-induced sediment and to set the filter pack. The well will then be measured and its location plotted on a site reap. The well casing will be surveyed for elevation to the same benchmark as the existing on-site monitoring wells. A licensed land surveyor or a registered civil engineer will conduct the surveying. 5. Within several days to one week following well installation and development, we will place this new well on the same sampling schedule as the four other existing wells. This well will be sampled for two quarters. The second quarter of ground-water sampling will take place 3 months following the initial round. The ground-water samples will be placed under chain-of-custody, to track sample handling, prior to delivery to a State of California certified analytical laboratory. The ground-water samples will be analyzed for the following parameters: JJW GEOSCIENCES Inc.