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order to confirm that location. During these transects , soil samples will be <br /> collected using the probing equipment. After the sump has been located by the <br /> probe transects , one groundwater observation well will be installed. The well <br /> [� location will be selected in consultation with Chevron hnd the RWQCB. We antic- <br /> ipate that the observation well will be on the down-gradient edge of the sump. <br /> This well will indicate whether free oil is present on the water table and will <br /> also allow groundwater sampling for chemical analysis, if desired. More details <br /> on the borings and well location are provided below. <br /> Probe Transects <br /> <� The former sump is believed to have been situated along what is now the <br /> eastern edge of Alden Park. The initial transect used to locate the sump is <br /> shown on Plate 2. This transect will indicate the width of the sump. <br /> Additional transects will be performed where access permits to further define <br /> the location of the former sump. <br /> The transects will be performed using procedures implemented to locate the <br /> concrete perimeter. For these transects , however, the solid probe tool will be <br /> replaced by a hollow 1-inch diameter casing which allows retrieval of soil <br /> samples. These samples are extruded in the field into appropriate containers <br /> for either physical examination or chemical testing. <br /> Continuous samples will be collected from the surface to a depth of approxi- <br /> mately 15 feet below ground surface. Probes will be advanced until soil that is <br /> {� not visually contaminated by hydrocarbons is encountered. <br /> Once the sump has been identified, selected soil samples from beneath the <br /> sump, but at or above the water table, will be submitted to a laboratory for <br /> analysis of oil and grease. <br /> The following procedure will be followed for soil samples collected from <br /> beneath the sump. The sampler will be fitted with clean, 6-inch long, 1-inch <br /> r� diameter brass sample tubes. After retrieval from the probe hole , the soil will <br /> be extruded by the HanDriven crew into a container provided by Anatec <br /> }� Laboratories, Inc. of Santa Rosa, California. The container will be sealed and <br /> t <br /> labeled. The labels will contain the following information: (1) boring number; <br /> f1 <br /> JED2/H -5- <br />