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4 <br /> Chevron <br /> Chevron USA Inc <br /> P D Sox 1392, Bakersfield, CA 93307 SEP 2 8 1932 <br /> ENVIRONMENTAL HEALTH 1 � <br /> PERMIT/SERVICESSeptember 24�, 1992 <br /> Mr-Harlin Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, California 95201 <br /> Re: Chevron USA Production/Carnation Plant <br /> 540 North Aurora Way, Stockton, CA. <br /> Dear Mr. Knoll <br /> Enclosed with this letter are the results of Second Quarter 1992 <br /> ground-water monitoring activities at the Chevron U.S.A. Production <br /> facility, Carnation Lease, Stockton, California. All monitoring <br /> activities at this site, previously owned by the Carnation Company, <br /> were conducted by RESNA Industries. <br /> As noted by RESNA, BETX constituents and total petroleum <br /> hydrocarbons as gasoline (TPHg) were found only in monitoring well <br /> #1 (MW1) . Concentration levels of toluene and xylenes were barely <br /> above the detection level for the laboratory method and well below <br /> their respective MCL Is. The concentration level of TPHg injMW1 was <br /> 160 parts per billion. There is currently no MCL defined for TPHg. <br /> Ground-water monitoring since May of 1991, has never shown BETX <br /> constituents to be at or above the mandated MCL' s. In all cases, <br /> BETX concentration levels have attenuated with time to either "not <br /> detected" , or 3ust above the detection limit of 0. 5 parts per <br /> billion. Most likely, this is a result of natural degradation that <br /> will continue down to and below the detection level. <br /> Chevron feels that any threats to human health or the environment, <br /> caused by formerly leaking underground fuel tanks (since 'removed) <br /> at this site, are well below reasonable action levels. Therefore, <br /> Chevron asks that San Joaquin County consider this site closed, and <br /> that future ground water-monitoring be permanently suspended. <br /> If you would like to meet with Chevron to discuss thisl,matter, <br /> please contact Cathy Copeland at (805) 392-3364 or myself at (805) <br /> 395-6439 at your earliest convenience. <br /> Thanks for your consideration in this important matter. <br /> J.M. Waldron, R.G. <br /> Senior Environmental Geologist <br /> Attachment <br />