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Mr Harlin Knoll 22 May 1998 Page 12 ' • The extent of TPH-g and BTEX in soil and ground water has been characterized by sampling performed at the site, • The source of TPH-g and BTEX in the soil and ground water has been removed, • The remaining TPH-g and BTEX in the soil at the site are a result of ground ' water transport and not a continuous source of ground water contamination, • The TPH-g and BTEX concentrations remaining at the site are relatively low, 1 • There are no potential receptors for the remai ung impacted soil and ground water, and • The TPH-g plume is not migrating off the site To demonstrate that there are no potential receptors for the remaining impacted ground water at the site, ERM will conduct a well survey in the vicinity of the site To document that the defined TPH-g and BTEX plume in ground water will not migrate off-site, ERM will collect samples from each of the downgradient monitoring wells installed at the site Samples will be collected on 1 June 1998 to confirm the initial sample results and during the following two quarters (September and December 1998) ERM will collect samples from the wells to document that the concentrations of TPH-g and BTEX compounds are remaining stable or decreasing If the sampling results indicate that the concentrations of TPH-g and BTEX are static or decreasing, the plume will be considered stable At that time, Heinz will submit a request for site closure, based on low risk, to 1 the County If the concentrations of TPH-g or BTEX increase in either of the monitoring wells, ERM will discuss the need for additional investigation or remedial activities with the County 1 you have an questions concerning this report, lease contact either of the If any g P P 1 undersigned at (925) 946-0455 Sincerely, Matthew L Brandy Patrick E Galvin, P E 1 Project Engineer Project Manager ' MXB/inxb/3374 30 attachments 1 cc Mr Donald Kirk, Heinz U S A (with attachments)