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California Department of Transportation April 24, 2000 <br /> Shop 10 Maintenance Station, Stockton, California Project No 400296-01 <br /> TPH-G increased in well VM-1 from 1,500 µg/1 to 1,800 gg/l and benzene increased from 192 <br /> pg/1 to 195 gg/1 Ethylbenzene has increased from 58 µg11 to 234 µg/1 and total xylenes have in- <br /> creased from 120 µg/1 to 271 µg11 <br /> Well VM-2 was paved over and could not be sampled <br /> According to laboratory analytical data for 826013, other VOCs that were detected during the <br /> current groundwater sampling event are 1,2-dichloroethane, 1,2,4-trimethylbenzene, 1,3,5- <br /> trimethylbenzene, isopropylbenzene, n-butylbenzene, and n-propylbenzene <br /> 6. RECOMMENDATIONS <br /> CATIONS <br /> Based on the results of the First Quarter 2000 groundwater monitoring analytical results, which <br /> indicated elevated concentrations of TPH-G, and/or BTEX, Ninyo & Moore recommends that <br /> quarterly groundwater monitoring continue at the site <br /> 1• <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 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 /> i <br /> may, therefore, be invalidated over time, in part or in whole, by changes over which Ninyo & <br /> Moore has no control I <br /> • <br /> shop 10 DR doe <br />