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Remo Canepa Page 5 of 5 <br /> 6230 Pacific Avenue May 18, 2011 <br /> Stockton, CA <br /> that also did not escape the secondary confinement system . The secondary confinement <br /> system was tested and found to be tight. No other record of a release from your UST system <br /> has been found and there is no record of a release to soil . If you believe your UST system has <br /> had a LIAR, you must show the release origin or find it. Note in the graphs above that no <br /> significant contaminant concentrations trends occurred that may be related to the reported 2006 <br /> incidents. Although the concentrations in MW-1 increased abruptly around 2005 , the more <br /> shallowly screened nearby SV-4 did not exhibit such an effect, which it would be expected to do <br /> as it is located between the UST system and the deeper-screened MWA . This demonstrates <br /> that the 2006 incidents are not likely to be the cause of the MW-1 concentration increase. <br /> The EHD has no record of a groundwater monitoring event being conducted on your site since <br /> May 2010 ; you have been and are currently under directive to conduct semi-annual monitoring . <br /> You are directed to conduct a groundwater monitoring event sampling all wells on the semi- <br />' annual and annual sampling schedules no later than 30 June 2011 and submit a report of <br /> findings to the EHD no later than 15 August 2011 . Prior to submitting the report, please review <br /> and revise the historical groundwater contaminant concentration tables as it appears that the <br /> TPHg concentration data may not have been converted correctly and is off by a factor of 10. <br /> You have been directed by EHD letters dated 01 December 2008, 11 March 2009 and 25 June <br /> 2009 to submit a feasibility plan for conducting additional remediation of impacted groundwater <br /> and to complete the lateral delineation of impacted groundwater; neither the feasibility study nor <br /> the work plan has been submitted to the EHD . You are now directed to submit the feasibility <br /> study and the work plan for additional delineation of impacted groundwater to the EHD within 30 <br /> days of date of this letter. <br /> If you have any questions or comments regarding the issues in this letter, please contact Vicki <br /> McCartney, REHS, at (209) 468-9852, or Nuel Henderson , PG, at (209) 468-3436. <br /> Victoria L McCartney, REHS Nuel C. Henderson, Jr. , PG <br /> Senior Registered Environmental Health acialist Engineering Geologist <br /> C: James Barton, RWQCB, 11020 Sun Center Dr. #200, Rancho Cordova , CA 95670 <br /> C: Robert Marty, AGE, 837 Shaw Road , Stockton, CA 95215 <br /> UAR Request Response and Directive Letter 0511 <br />