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' • •Herman&Helen's Marina—Work Plan Additional Soil and Groundwater Investigation t Surface Water Sampling May 27,1998 Page 4- The decontamination rinsate will be placed in a 55-gallon drum, sealed, labeled, and left on site pending laboratory analyses. Disposal of hazardous materials, if any, will be the responsibility of the property owner. 3.4 GROUNDWATER SAMPLING The Geoprobe groundwater sampler is designed to be hydraulically pushed into the aquifer from the ' bottom of a borehole, to collect a groundwater sample. The sampler utilizes a sealed, watertight, stainless steel sample chamber and PVC screen, which is isolated from the surrounding environment as the sampler is advanced. When the desired depth for collection of a groundwater sample is reached, the ' sample chamber is opened by pulling back on the body of the sampler, exposing the screen. When the screen is full, a small diameter Teflon bailer is lowered into the push rod and a groundwater sample is retrieved from the sample chamber. A groundwater sample will also be collected from all hand augured soil borings installed at the site. Once the boring has been advanced to approximately three feet below the water table, a temporary, PVC ' screen will be placed into the boring and a sample will be collected using a clean Teflon bailer. The bailer samples will be inspected for free product, petroleum odor, and sheen. The samples will be gently poured into three 40-m1 glass volatile organic analyses (VOA) vials. The sample containers will be sealed, labeled, and placed in a cooler chilled with ice for delivery under chain-of-custody procedures to GeoAnalytical Laboratories, in Modesto, California for analyses. ' 3.5 SURFACE WATER SAMPLING Four surface water samples will be collected from the drainage system adjacent to the site. A sample ' will be collected upstream of the site in both the drainage ditch (located east of the site) and the island drainage channel (located south of the site) to investigate the background water quality. A sample will also be collected downstream of the site in both the drainage ditch and island drainage channel to ' investigate any potential impact from the site. Figure 4,Appendix A, shows the sampling locations. The drainage ditch water samples will be collected from approximately 100 feet north of the intersection of the drainage ditch and Eight Mile Road, and from the intersection of the drainage ditch and Eight Mile Road. The island drainage ditch water samples will be collected from approximately 100 feet east of the intersection of the drainage ditch and the island drainage channel, and from near the pump house inlet of the island drainage channel. Surface water samples will be collected using a teflon dipping cup attached to an extending pole. Prior to sampling, the water sampling equipment will be cleaned as discussed in Section 3.2.1. Following ' cleaning, the dipping cup will be lowered approximately one foot below the water surface and gently raised to the surface. Each water sample will be gently poured from the device into three VOA sample containers. Samples will be labeled, stored in a cooler chilled with ice and delivered within 24 hours of ' collection, under chain-of-custody procedures, to GeoAnalytical Laboratories, in Modesto, California (a California State Certified laboratory). The water samples will be analyzed using U.S. EPA Methods and California-approved methods following quality assurance measures. Laboratory analyses are discussed ' in Section 3.6. ' ;• CONDOR