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`M <br /> �a <br /> is lighter than diesel fuel but heavier than gasoline. There are <br /> five different formulations for stoddard solvent, none of which <br /> contain chlorinated compounds. In addition, as shown in the attached <br /> MSDS, the decomposition products of stoddard solvent are carbon <br /> monoxide and carbon dioxide. Based on this discussion, there is no <br /> apparent relationship between stoddard solvent and any chlorinated <br /> compounds. It is known that stoddard solvent was previously used in <br /> the dry cleaning industry, whereas today tetrachloroethylene (PCE) <br /> is commonly used. Perhaps this explains why stoddard solvent and PCE <br /> have been found in some of the RWQCB's investigations of dry <br /> cleaners. <br /> Again, it is pertinent to point out that the only groundwater sample <br /> that has shown any detectable concentrations of chlorinated compounds <br /> was collected from well MW-5. This well is at the rear of the ST <br /> Services' facility, and is furthest away from any of the former <br /> Unocal underground tanks and piping. It is also important to point <br /> out that all six monitoring wells at the site were analyzed for TPH <br /> as stoddard solvent on May 31, 1989, and that no detectable <br /> concentrations of this contaminant were encountered in any of the <br /> wells (please refer to the Kleinfelder report dated June 29, 1989) . <br /> 3 . Based on our telephone conversation of January 28 , 1994 , it is my <br /> understanding that you have copies of all the environmental reports <br /> pertaining to this site. <br /> I trust this letter satisfactorily addresses the comments in your January <br /> 14, 1994 letter. It is Unocal's technical opinion that contamination <br /> from our operation of a bulk plant at this property is negligible and <br /> does not warrant additional environmental assessment, remediation, or <br /> monitoring. If you agree with this assessment, a concurrence letter <br /> would be greatly appreciated. If you have any additional questions or if <br /> you still need additional information, please feel free to call me at <br /> 510-277--2334 . <br /> Si cerely, <br /> Robert Boust <br /> Senior Environmental Engineer <br /> cc: Harlin Knoll, SJCPHS <br /> Tim Ross, KEI <br /> Ron Bock, Unocal <br />