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49 South Wilson Way, Stockton, California April 4, 1997 Page 2 ,T the site or contributed to the contamination on the adjacent properties for the following reasons: 1. The groundwater depth and flow direction data measured at the Knowles Roek site correspond with those measured at the Wells Fargo site. The regional groundwater flow direction in the area is toward the northeast which corresponds with the flow directions measured at the Wells Fargo and Knowles Roek sites. The groundwater flow direction at the Top Filling Station site differs from the measured flow direction at the Wells Fargo and Knowles Roek sites by almost 90 degrees. The variations in groundwater flow direction may be from seasonal fluctuations of groundwater elevation and/or anomalous measurements. 2. MTBE has not been detected beneath the Wells Fargo property. The monitoring wells at the Top site with high TPH-g and benzene concentrations also have elevated levels of MTBE. Since the use of MTBE in fuels is relatively recent(widespread use of MTBE began in the 1980's) it appears that the Top Filling Station contaminant plume is also relatively recent and not due to previous activities at49 South Wilson Way. 3. The concentrations of TPH-g and BTEX beneath the Wells Fargo property are much lower than the concentrations present at the Top or Roek sites. Based on a review of the data collected as part of this investigation, Building Analytics recommends that no additional work Abe required and the Wells Fargo property at 49 South Wilson Way site be given a status of no further action. �} If you have any questions regarding this report, please call me atS 1 S { )500-1898. Respectfully submitted, BUILDING ANALYTICS ' Jan $ hutze, M.S., R.G. Vice resident,Environmental Services ■ cc: Ms. Linda Turkatte, R .E.H.S. San Joaquin County Public Health Services, ) I