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Margaret Lagorio EH <br /> From: Jim Barton Lbarton@waterboards.ca.gov] <br /> Sent: Wednesday, February 18, 2009 10:05 AM <br /> To: Margaret Lagorio [EH] <br /> Cc: Nuel Henderson [EH]; Vicki McCartney[EH]; James Munch <br /> Subject: Re: 1030 S. Olive Street, Stockton <br /> Attachments: Letter 1-14-09.pdf; Letter 08-08-08.pdf; 4Q2008.pdf; 3Q2008.pdf <br /> lJ I=1 LTJ L J <br /> Letter 1-14-09.pdf Letter 08-08-08.pdf 4Q2008.pdf(2 MB) 3Q2008.pdf(10 <br /> (172 KB) (222 KB) MB) <br /> Hi Margaret, <br /> I have reviewed the attached documents. I also reviewed our file and the most recent <br /> monitoring reports for each of the two sites (4Q2008 for 1030 Olive St. and 3Q2008 for <br /> 4075 Main St. ) , and discussed the case briefly with Jim Munch. <br /> Based on the most recent 1030 Olive Street report, it appears that there is only one <br /> monitoring well (MW-1) on the site, and groundwater flow direction is not discussed. The <br /> 4075 Main St. report shows groundwater flowing northeast to southeast (away from 1030 <br /> Olive St) , with isoconcentration contours showing the groundwater contaminant plume moving <br /> southeast under Main St (away from 1030 Olive St) . <br /> Our file included an 8 August 2008 County letter request to 1030 Olive St. for a workplan <br /> to demonstrate vertical and lateral extent of the groundwater plume. A 18 December 2008 <br /> County letter gave an extension for submitting the workplan until 9 January 2009. To <br /> date, the workplan has not been submitted. <br /> The file includes a County letter that states the 1030 Olive St. consultant contacted the <br /> County by phone on 8 January 2009, claimed the source of the groundwater pollution at 1030 <br /> Olive St. is 4075 Main St, and requested closure. In response to the consultant' s request <br /> for closure, the 14 January 2009 County letter reiterated the request for a workplan for <br /> an investigation of lateral and vertical extent at 1030 Olive St. , and also requested <br /> hydrogeologic cross sections to show plume pathways in support the consultant' s above <br /> mentioned claim, with a resurvey of MW-11s elevation to the same benchmark used for the <br /> 4075 Main St site wells. <br /> While the known contaminant concentrations in soil were initially low and current <br /> groundwater concentrations are low (TPHg, 130 ug/L) at 1030 Olive St, the 8 August 2008 <br /> County letter also requested that the workplan include an evaluation for vapor intrusion. <br /> The 1030 Olive St. documents in our file do not address possible vapor intrusion, which is <br /> now a requirement from State Board for closure. <br /> Please provide the vapor intrusion evaluation if it exists. Upon receipt, we will then <br /> evaluate the data, and if the data are favorable (no threats from vapor intrusion) , we <br /> will be better able support the County recommendation for closure for 1030 Olive St. if <br /> the vapor intrusion evaluation is not available, please refer the 1030 Olive St. case to <br /> the Regional Board for enforcement. We will write a 13267 Order to get a vapor intrusion <br /> evaluation report. <br /> Thanks. <br /> Jim <br /> >>> "Margaret Lagorio [EHJ " ¢MLagorio@sjcehd.com> 2/17/2009 3 :05 PM >>> <br /> Jim, <br /> Please review the above site information from 4075 Main Street and 1030 Olive Street which <br /> are adjacent to each other. The Main Street site UST system removals occurred in December <br /> 1 <br />