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t,atitro nia U�pai JI_eCIL Qi i.L. Jr�i .. W .�z •" I-), _ , , . <br /> Stockton Maintenance Station, Stockton, California Project No 400296-01 <br /> In well MW-6, TPH-G concentrations remained constant at 300 pg/l <br /> In well VW-1 concentrations of TPH-G decreased from 600 pgll to 350 µg11 Benzene decreased <br /> from 11 lxg/l to non-detectable levels <br /> In well VW-2 concentrations of TPH-G decreased from 12,000 µg11 to 10,000 Vg/1 Benzene <br /> decreased from 992 pg/1 to 824 pg/l Toluene decreased from 144 µg11 to 62 µg11 Ethyl- <br /> benzene decreased from 439 pg/1 to 339 pg/l Total xylenes decreased from 1,380 µg/1 to 372 <br /> µg11 MTBE concentrations increased from non-detectable levels to 38 µg/l <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, 1,2,4- <br />! trimethylbenzene, 1,3,5-trimethylbenzene, isopropylbenzene (cumene), and napthelene <br /> lie 6. RECOMMENDATIONS <br /> Based on the results of the Third Quarter 2000 groundwater monitoring analytical results, which <br /> indicated elevated concentration of TPH-G, TPH-D, BTEX and MTBE, Ninyo & Moore recom- <br /> mends 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 /> i 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 /> I <br /> I 0'90 01[SlCCMOn Feil 3Q2640 doc <br /> 5 <br />