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California Department of Transportation September 6, 2001 <br /> p p <br /> Shop 10 Maintenance Station, Stockton, California Project No 400296001 <br /> ug/l Ethyl-benzene concentration has increased from 94 µg/1 to 330 µg11 Total xylene concen- <br /> tration has decreased from 15 gg/l to 4 0 µg11 <br /> According to laboratory analytical data using EPA method 8260B, additional compounds were <br /> detected in samples from various on-site wells during the current groundwater sampling event <br /> These compounds include, 1,2,4-tnmethylbenzene and naphthalene <br /> 6 RECOMMENDATIONS <br /> Based on the results of the Second Quarter 2001 groundwater monitoring analytical results, <br /> which indicated elevated concentrations of TPH-G, and/or BTEX, Ninyo & Moore recommends <br /> that quarterly groundwater monitoring continue at the site <br /> 7 LIMI'T'ATIONS <br /> lie 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 that this study did <br /> not 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, ib <br /> designed to completely represent any aspect of the project described herein Ninyo & Moore <br /> 1 � <br /> 02960lrshop to2Q01 doc 5 li <br />