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Spreckels Sugar Tracy, California JOB 96017 Because the last test result is inconsistent with the previous, Well B will be tested again. i All of the detected constituents are related to gasoline, for which there is a closer release to account for their presence. There is no indication from the tests that Bunker C is present . Bunker C fuel oil is non-hazardous, not soluble in groundwater, contains no carcinogenic components, and has extremely limited mobility in soil . The vault is located between the railroad tracks and the molasses tank. It is not possible to put a drill rig downgradient of the vault . In order to achieve a determination that no further action is required, the following items will be evaluated. (1) There should be a monitoring well in the downgradient direction in the shallow groundwater which shows no significant concentrations of Bunker C hydrocarbon constituents . Well B will be used for that purpose . An additional sample will be tested specifically for Bunker C components . This will be accomplished by giving the certified laboratory a sample of Bunker C oil to use as the calibration standard for the Total Petroleum Hydrocarbon test. (2) There should be an additional soil boring to establish the point at which Bunker C is no longer present in the soil . Based upon my experience with Bunker C oil, that distance is 30 feet . A test hole would therefore be hand augered at a distance of 30 feet from the vault in the downgradient direction, as shown on Figure 2 . During the hand augering, undisturbed soil samples would be taken at 51 , 10 ' , and 15 ' deep . The soil samples would be submitted to a certified laboratory for the Total Petroleum Hydrocarbon test using Bunker C as the calibration standard. In the event that it was in the zone of impacted soil, we would move out 30 more feet and redrill . The soil boring would be logged by a licensed geotechnical engineer . (3 ) At the time the monitoring well was sampled, the groundwater elevation at all the wells would be established. The groundwater contour map would be prepared. I am licensed to perform surveys in the State of California. (4) The well would be purged of at least 5 well volumes before sampling. A Teflon bailer would be used to sample . The person would be a Class A Title 22 sampler. The samples would be placed in bottles provided by the testing laboratory. The samples would be kept in an ice chest with blue ice for delivery to the certified laboratory in 24 hours . Chain of custody would be established. . I 2