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URS <br /> Mr. Jeffrey Wong <br /> San Joaquin County Environmental Health Department <br /> October 4, 2002 <br /> Page 5 <br /> lateral conduits for impacted groundwater encountered near the pump islands. No wells were observed <br /> by URS on the ARCO property or on adjacent properties. <br /> Conclusions <br /> Fuel-related contaminants were not observed in any of the soil samples collected during the <br /> investigation and were not detected above reporting limits in the three soil samples that were submitted <br /> for laboratory analysis. Detectable concentrations of TPHg and MtBE were reported in the <br /> groundwater sample collected from the upgradient monitoring well MW-2. Low levels of MtBE were <br /> also reported in the groundwater sample from MW-3. The samples collected from the downgradient <br /> monitoring well MW-4 did not contain detectable concentrations of TPHg,BTEX, or fuel oxygenates. <br /> If you have any questions or comments regarding this letter, please call Mr. Vernon Elarth at(916)679- <br /> 2299. <br /> Sincerely, <br /> URS 9orporation Americas ED GE <br /> PAUL F(q Cid' <br /> O <br /> Scott Lookingbi <br /> Staff Geologist <br /> No. 12 <br /> Exp. <br /> Vernon Elarth, RG. <br /> Project Manager '9TF OF�A�1FOQ' j <br /> Attachments: Table 1 - Soil Analytical Data <br /> Table 2 - Groundwater Elevation and Analytical Data <br /> Table 3 - Fuel Oxygenates Analytical Data <br /> Table 4 - Groundwater Gradient and Flow Direction <br /> Figure 1 - Site Location Map <br /> Figure 2 - Groundwater Elevation Contours <br /> Figure 3 - Groundwater Analytical Summary <br /> Figure 4 - Underground Utility Location Map <br /> Attachment I -SJCEHD Correspondence <br /> Attachment II -Soil Boring Logs and Well Completion Details <br /> Attachment III - Soil Disposal Documentation <br /> Attachment IV -Well Development and Purge Sheets <br /> Attachment V -Well Sampling and Analysis Procedures <br /> Attachment VI -Well Survey Data <br /> Attachment VII -Laboratory Analytical Reports and Field Data Sheets <br /> . cc: Mr. Paul Supple, ARCO Products Company <br /> Mr. Marty Hartzell, RWQCB, Central Valley Region <br /> 7G600-022-02/Site Investigation ReportK:U5 BP ARCO\05450\Site investigation Report.doc <br />