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GROUND WATER INVESTIGATION WORK PLAN BULK TERMINALS SITE, PORT OF STOCKTON, STOCKTON, CALIFORNIA below. Water sample containers will be sealed, labeled, and placed in a cooler containing ice immediately after collection. The label will identify the boring number, upper depth of the sample interval, date and time of sample collection, and sampler's initials. The samples will be transported to the designated state-certified laboratory following standard chain-of-custody protocols. Samples to be analyzed for dissolved metals concentrations will be filtered at the laboratory using a 0.45 µin filter prior to sample preservation. 3.1.2.6 Boring Completion Upon completion of sampling and data collection activities, the borings will be tremied from the bottom to the surface using a mixture of neat cement and bentonite clay. The top of the boring will be finished in a manner similar to surrounding materials. A licensed surveyor will locate each boring relative to mean sea level elevation. The boring locations will also be located horizontally within the NAD 23 coordinate system using the Global Positioning System (GPS). Soil materials generated from the borings, and water and wastewater generated from investigation and decontamination activities will be placed in a 55-gallon Department of Transportation (DOT) drum, labeled appropriately, and stored on-site pending future disposal. Results of soil and ground water sample analyses may be used to identify appropriate disposal facilities. 3.1.2.7 Existing Monitor Well Sampling Ground water samples will be collected from wells MW-1 through MW-4 to supplement ground water data from the screening-level sampling. At each well, depth to water and total well depth will be measured to the nearest 0.01 foot with an electronic water-level indicator. Following depth-to-water measurements, a minimum of three casing volumes of ground water will be purged using disposable bailers or a peristaltic pump. Temperature, pH, conductivity, and dissolved oxygen content (DO) of the purged water will be monitored in the field during well purging. Purging will continue until water parameters stabilize to within 10 percent of successive measurements. Samples will be collected after the water level has recovered to at least 80 percent of the original volume in the well. If the well is purged dry, additional purging will not be performed and samples will be collected after the water level has recovered to 80 percent of the original volume in the well. Ground water samples will be collected into laboratory prepared bottles using a disposable bailer or peristaltic pump. The bottles will promptly sealed, labeled, and placed in a chest containing ice pending transportation to the analytical laboratory. Samples to be analyzed for dissolved metals concentrations will be filtered at the laboratory using a 0.45 µm filter prior to sample preservation. July 2005 Page 12 Environmental Risk Services Corp.