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Ms. Penny Fotrell �"'� - 2 - 08 November 2002 <br /> Chevron Environmental Management Company <br /> related hydrocarbons in the soils at the site are below levels that would constitute an unacceptable risk to <br /> human health and the environment. <br /> Groundwater occurs about five to seven feet bgs at the site and flows generally north-northwest. <br /> Groundwater monitoring data show that the residual petroleum present in soil at the site is not providing <br /> a significant source of dissolved petroleum constituents to groundwater. Seven grab groundwater <br /> samples were analyzed for TPH as gasoline, TPH as diesel, BTEX, and polynuclear aromatic <br /> hydrocarbons (PAHs). Of these samples, only MB-1 which was within the soil-affected area, contained <br /> detectable contaminant concentrations [TPH as gasoline (TPHg) at 660 µg/1, TPH as diesel (TPHd) at <br /> 700 µg/l, xylenes at 3.1 µg/l, acenaphthene at 1.1 µg/l, fluorene at 3.8 µg/1, and phenanthrene at 1.4 <br /> gg/lj. Of these constituents, applicable water quality objectives (WQOs) were exceeded for TPHg and <br /> TPHd. However, groundwater impacts are limited, and these constituents are known to degrade in <br /> groundwater such that WQOs are expected to be achieved in a reasonable timeframe. <br /> Based on the data and information described above, no further action is required at the site. Nothing in <br /> this determination shall constitute or be construed as a satisfaction or release from liability for any <br /> conditions or claims arising as a result of past, current, or future operations at this location. Nothing in <br /> this determination is intended or shall be construed to limit the rights of any parties with respect to <br /> claims arising out of or relating to deposit or disposal at any other location of substances removed from <br /> the site. <br /> If existing, additional, or previously unidentified chemical constituents at the site cause or threaten to <br /> cause pollution or nuisance or are found to pose a threat to public health or water quality, then 1)nothing <br /> in this determination is intended or shall be construed to limit or preclude the Board or any other agency <br /> from taking any further enforcement action, and 2) this letter does not relieve Chevron of any <br /> responsibilities mandated under the California Health and Safety Code and the California Water Code. <br /> Changes in land use may require further assessment and mitigation. <br /> If you have any questions, you may call Jim Barton at (916) 255-3050 or e-mail him at <br /> bartonj@rb5s.swrcb.ca.gov. <br /> o1r ANTIO K. J. VORSTER, P.E. <br /> Acting Assistant Executive Officer <br /> cc: Mr. Mike Infurna, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Bryan Turner, Geomatrix Consultants, San Ramon <br />