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Mr. Joe Herrud, Leprino Ads - 2 - 15 March 2013 <br /> Leprino Facility, 2401 MacArther Drive, Tracy <br /> 2. Monitoring well RW-1 contained TPHd during the third quarter monitoring event. This is <br /> the first detection in this well since March 2008. By 28 June 2013, Leprino needs to <br /> collect a groundwater sample from this well and analyze it for TPHd and naphthalene. <br /> 3. In 2011, Leprino installed a passive soil ventilation system in monitoring well MW-4 to <br /> mitigate TPHd and naphthalene soil vapor concentrations within the dry powder storage <br /> warehouse. Soil vapor samples have not been collected since the installation of the <br /> ventilation system. By 28 June 2013, Leprino needs to collect an indoor air sample from <br /> the dry powder storage warehouse. In addition, Leprino should temporarily remove the <br /> ventilation piping and collect a soil vapor sample from the headspace of monitoring well <br /> MW-4. Soil vapor samples need to be analyzed for TPHd and naphthalene. <br /> In summary, by 28 June 2013 Leprino needs to do the following: <br /> • Remove the pump from EW-3. <br /> • Collect groundwater samples from EW-3 and RW-1 and analyze them TPHd and <br /> naphthalene. <br /> • Collect indoor air sample from dry storage warehouse and analyze it for TPHd and <br /> naphthalene. <br /> • Remove ventilation system from MW-4 and collect soil vapor sample and analyze it for <br /> TPHd and naphthalene. <br /> If you have any questions regarding this letter, you may contact me by phone at (916) 464-4819 <br /> or by email at kshelton aawaterboards.ca.gov. <br /> KRISTI SHELTON, P.E. <br /> Water Resources Control Engineer <br /> Aboveground Tanks Cleanup Unit <br /> cc: Ms. Lori Duncan, San Joaquin County Environmental Health Services, Stockton <br /> Mr. Reed Azevedo, Leprino Foods Company, Tracy <br /> Mr. Brendan Shine, Tetra Tech GEO, Westminster, Colorado <br />