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�r> <br /> S E C ® R <br /> .�r <br /> Mr Ed Ralston <br /> September 7, 2004 4 <br /> Page 4 <br /> `r <br /> t <br /> CONCLUSION AND RECOMMENDATION <br /> Based on analytical results, minor detections of petroleum hydrocarbons in sod were noted in the <br /> capillary fringe sample (GP-13@10') The hydrocarbon Impacted sod reported in GP-13 is likely due <br /> to transport of petroleum hydrocarbons through the capillary fringe Dissolved petroleum <br /> concentrations In groundwater were delineated to non-detect levels with the exception of MtBE In GP- w' <br /> 12 at a concentration of 0 88 ug/L (MCL of 5 0 ug/L) and ethanol In GP-13 at a concentration of 610 <br /> ug/L <br /> SECOR suggests that three groundwater monitoring wells be Installed at the locations shown on <br /> Figure 1 Installation of the wells will provide continued verification that the plume is delineated A <br /> work plan for well Installation is being submitted under separate cover A Site Conceptual Model will <br /> be submitted upon completion of the well Installation (discussed further in the work plan) <br /> If there are any questions, please call us at (916) 861-0400 <br /> s�Sincerely, 4 <br /> SECOR International, Incorporated <br /> ';�QfkOFESSIp <br /> Clinton Harms <br /> Associate Scientist 'r �� 058399 , <br /> CiYll_ <br /> Rusty Benkosky, P E <br /> 9�OF CAt-iFa�'�\P <br /> Senior Engineer <br /> Attachments Table 1 —Soil Analytical Results <br /> Table 2—Groundwater Analytical Results <br /> Figure 1 —Site Plan With Geoprobe Locations <br /> Attachment A —SJCEHD Letter Dated January 6, 2004 <br /> Attachment B —SJCEH and City of Lathrop Permits <br /> Attachment C — Boring Logs and Well Construction Details <br /> Attachment D — Field and Laboratory Procedures <br /> Attachment E —Certified Laboratory Analytical Reports and <br /> Chain-of-Custody Documentation (Soil <br /> cc Mr Ed Ralston, ConocoPhillips <br /> Mr James Barton, RWQCB, Sacramento Office <br /> I IConocoPhillips\Tosco Markebng112051Reportslgeoprobe rpt 9-04 doc <br />