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Mr Kyle Christie <br /> September 23, 1996 <br /> Page 4 <br /> Conclusions <br /> The vadose zone soil has not been impacted with BTEX , TPH-G, or MTBE in the area where <br /> hydrocarbon impacted soil was removed during the fiber trench/product piping replacement In <br /> addition, groundwater has not been impacted with toluene, ethylbenzene, xylenes, or TPH-G <br /> However, benzene and MTBE was identified in the groundwater sample collected from MW-1 <br /> at low concentrations Monitoring well MW-1 will be monitored and sampled in the <br /> fourth quarter 1996 Based on the results of the fourth quarter sampling, PHS-EHD will make a <br /> decision as the future need of this well If sampling of this well is no longer necessary, ARCO <br /> will request regulatory closure of this site <br /> If you have any questions regarding this report,please contact me at(916)444-0123 <br /> Sincerely, <br /> BROWN AND CALDWELL <br /> zs�:a kt�-� <br /> Steve Misner <br /> Project Manager <br /> California Registered Geologist#6374 <br /> SM vm <br /> Enclosures <br /> cc Mr Micheal Infurna, San Joaquin Public Health Services, Environmental Health Division <br /> Mr Brian Newman,California Regional Water Quality Control Board, CVR <br /> Use or disclosure of data continued on this sheet is subject to the restriction specified at the beginning of this <br /> document <br /> 40111REPORTS}5450RPT1 DOC <br />