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URS <br /> Mr Mike Infuma Page 7 <br /> San Joaquin County Environmental Health Department <br /> ARCO 6020 <br /> September 29, 2003 <br /> natural attenuation has been effective at remediating impacted groundwater It is expected that natural <br /> attenuation will continue to reduce MtBE concentrations in MW-6 to below maximum contaminant levels <br /> (Figure 6) <br /> URS recommends that quarterly groundwater monitoring be continued to evaluate TPHg and MtBE <br /> concentrations in wells MW-6 and MW-13D If concentrations of these compounds continue to decrease <br /> URS will recommend that SJCEHD consider this site for closure <br /> If you have any questions or comments regarding this letter,please call Mr Vernon Elarth at(916)679-2299 <br /> Sincerely, <br /> URS Corporation Americas ED GEO� <br /> fir% Au( <br /> No 120 <br /> Scott Lookingbtll Vernon Elarth, RG Exp 1 3 0 <br /> Project Geologist Project Manager <br />' Attachments Table 1 Groundwater Gradient Data 9 OF CAU_W <br /> Table 2 Soil Analytical Data <br /> Table 3 Soil Analytical Data for Fuel Oxygenates <br /> Table 4 Groundwater Elevation and Analytical Data <br /> Table 5 Fuel Oxygenates Analytical Data <br /> Figure 1 Site Location Map <br /> Figure 2 Site Plan <br /> Figure 3 Cross Section A-A' <br /> Figure 4 Groundwater Elevation Contours (July, 2003) <br /> Figure 5 Groundwater Analytical Summary(July, 2003) <br /> Figure 6 Concentration and Water Level Trends (MW-6) <br /> Figure 7 Exposure Evaluation Flowchart <br /> Attachment A SJCEHD Correspondence <br /> Attachment B Historical Soil Analytical Data <br /> Attachment C Soil Boring Logs and Well Completion Details <br /> Attachment D Field and Laboratory Procedures <br />' Attachment E Field Sheets <br /> K 1Wprocessv5 BP ARCM602012003 Assessment%020 Assessment&SCM 2003 doc <br />