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California Department of Transportation November 24, 1999 <br /> Stockton Maintenance Station, Stockton, California Project No 103872-02 <br /> A duplicate sample, identified as VW-22, was taken at VW-2 The fourteen-day holding times <br /> were exceeded for the benzene, ethylbenzene, and total xylenes samples for both VW-2 and VW- <br /> 22, therefore these sample results are not considered valid <br /> 0 <br /> According to laboratory analytical data using EPA method 8260B additional compounds were <br /> detected in samples from various on-site wells These compounds include napthalene, 1,2,4- <br /> trimetheylbenzene, isopropylbenzene, tert-butylbenzene, and 1,3,5-trimethylbenzene <br /> G. RECOMMENDATIONS <br /> Based on the results of the Third Quarter 1999 groundwater monitoring analytical results, which <br /> indicated elevated concentration of TPH-G, TPH-D, BTEX, and/or MTBE Ninyo & Moore rec- <br /> ommends that quarterly groundwater monitoring continue at the site <br />�. 7. LIMITATIONS <br /> The environmental services described in this report have been conducted in general accordance <br /> with current regulatory guidelines and the standard-of-care exercised by environmental consult- <br /> ants performing similar work in the project area No other warranty, expressed or implied, is <br /> made regarding the professional opinions presented in this report Please note this study did not <br /> include an evaluation of geotechnical conditions or potential geologic hazards <br /> Our conclusions, recommendations and opinions are based on an analysis of the observed site <br /> conditions and the referenced literature It should be understood that the conditions of a site can <br /> change with time as a result of natural processes or the activities of man at the site or nearby <br /> sites In addition, changes to the applicable laws, regulations, codes, and standards of practice <br /> may occur due to government action or the broadening of knowledge The findings of this report <br /> may, therefore, be invalidated over time, in part or in whole, by changes over which Ninyo & <br /> Moore has no control <br /> This document is intended to be used only in its entirety No portion of the document, by itself, is <br /> . designed to completely represent any aspect of the project described herein Ninyo & Moore <br />