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California Department of Transportation September 6, 2001 <br /> Stockton Maintenance Station, Stockton, California Project No 400296001 <br /> According to laboratory analytical data for VOCs using EPA method 8260B, 1,2,4- <br /> tnmethylbenzene, 1,3,5-tnmethylbenzene, and napthalene were detected in samples from on-site <br /> well VW-1 and MW-2 Napthalene and 1,2,4-tnmethylbenzene were also detected in MW-8 <br /> 6. RECOMMENDATIONS <br /> Based on the results of the Second Quarter 2001 groundwater monitoring analytical results, <br /> which indicated elevated concentration of TPH-G, TPH-D, and BTEX Ninyo & Moore recom- <br /> mends that quarterly groundwater monitoring continue at the site <br /> i7. ]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 onlyin its entirety No of the document b itself, is <br /> Y portion y , <br /> designed to completely represent any aspect of the project described herein Ninyo & Moore <br /> should be contacted if the reader requires any additional information or has questions regarding <br /> the content, interpretations presented, or completeness of this document <br /> 0:96 01 stoclton:Q01 duc 6 <br />