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URS <br /> Ms Lori Duncan Page 6 <br /> San Joaquin County Environmental Health Department <br /> March 25, 2004 <br /> InStrat, Inc in Davis, California, for disposal Waste disposal manifests for soil and waste water are <br /> included as Attachment G <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Based on the data collected during this well installation event, groundwater in the vicinity of newly <br /> installed deep monitoring well MW-12D has been impacted by GRO, BTEX compounds, and MtBE <br /> However, the detected concentrations of hydrocarbons may be due to downward smearing of <br /> contamination during drilling URS will evaluate trends in hydrocarbon concentrations in MW-12D to <br /> assess if vertical delineation of petroleum hydrocarbons has been achieved downgradient of the former <br /> source area The new well has been added to the quarterly groundwater monitoring schedule <br /> This report is based on data, site conditions, and other information that are generally applicable as of the <br /> date of the report, and the conclusions and recommendations herein are therefore applicable only to that <br /> time frame <br /> If you have any questions or comments regarding this report, please call Mr Jeff Brooks at <br /> (916) 679-2383 <br /> Sincerely, <br /> D GEOI <br /> URS Corporation Americas `� ON pAl1f F �G'i� <br /> No 7 20 <br /> Exp ! 1 yk <br /> Jeff Brooks Vernon Elarth, R G <br /> Staff Geologist Project Manager '9TF OF CAOO``z <br /> K 1WprocessU5 8P ARCO\044931Well lnstall14493 well installation repor04 doe <br />