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r � � <br /> r r <br /> Grewal's Market Page 2 <br /> 4100 East Fremont Street May 29, 2009 <br /> Stockton, California 95215 <br /> The sampling points from which these data were derived form a sort of"curtain" stretching cast, <br /> west, and north of the P-15B point. Intuitively, if the TPH-g detected in the P-15B sample were <br /> part of a significant mass of dissolved TPH-g originating in the suspected source area(s), one or <br /> more of these sampling points should also have been impacted. As they were not, the EHD <br /> concludes it is not likely that the P-15B "hit" is part of a significant plume originating from your <br /> unauthorized release. <br /> The primary purpose of advancing P-15B was to complete the lateral assessment of the <br /> 1,2-dichloroethane (1,2-DCA) plume down-gradient of MW-4. Noting that 1,2-DCA was not <br /> detected in any grab groundwater samples collected from P-15B, the EHD considers the 1,2-DCA <br /> plume defined down gradient of the source area; therefore, the EHD rescinds the directive by letter <br /> dated May 11, 2009, to submit a work plan addendum to address the collection of a grab <br /> groundwater sample adjacent to P-15B. <br /> The EHD directs the submittal of a comprehensive site closure summary by September 3, 2009. <br /> Include an interpretation of the presence of TPH-g in groundwater collected from P-1513; an <br /> evaluation of soil concentrations that exceed the Environmental Screening Levels (ESLs) (San <br /> Francisco Bay Regional Water Quality Control Board) for gross contamination and direct exposure; <br /> previous and current estimates of the residual TPH-g and total petroleum hydrocarbons quantified <br /> as diesel (TPH-d) masses in soil and groundwater; a site map indicating the correct locations for <br /> P-15 and P-16, and omitting P-17; and nearby sensitive receptors. <br /> If you have any questions, please contact Vicki McCartney by telephone at (209) 468-9852 or by <br /> email at vniecartney(ii',sicehd.coni. <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel C. Henderson,Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. Timothy J. Cuellar, Advanced GeoEnvironmental, Inc., 837 Shaw Road, Stockton, <br /> California 95215 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central Valley <br /> Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br />