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Ms. Joachim - 5 _ <br /> 22 June 2012 <br /> Additional Directives <br /> 6. Nestle must install additional monitoring wells to characterize the COC plumes on and near <br /> the Nestle facility in the B-/Upper A-Zone at each of the following locations: the M-12 <br /> monitoring well nest, the M-16 nest, the M-10 nest, and near soil boring CPT-30. <br /> 7. Nestle must install additional monitoring wells to characterize the COC plumes on and near <br /> the Nestle facility in the Lower A/shallow C-Zone at each of the following locations: the M-16 <br /> monitoring well nest and near soil boring CPT-30. <br /> 8. Nestle must continue to operate groundwater extraction wells EI-1, EU-3 and EU-4; a six- <br /> month shutdown test is not warranted at this time. In fact, Nestle must evaluate remedies <br /> including groundwater extraction and treatment for COCs in groundwater west and <br /> northwest of the facility, beyond the capture zones of these wells. The evaluation must <br /> include remedies for cleanup of COCs in the B- and Upper A-Zones, and the Lower A- and <br /> shallow C-Zones. <br /> 9. Nestle must evaluate the impact to the Lower Aquifer(D-Zone) by water supply well <br /> conduits. The evaluation must characterize the extent of D-Zone impact, and attempt to <br /> quantify the mass of TCE and its breakdown products that migrated in this way. <br /> If you have any questions, please contact Jim Brownell at (916) 464-4675, or by email at <br /> jbrownell@waterboards.ca.gov. <br /> .40_� <br /> JAMES R. BROWNELL, P.G. <br /> Engineering Geologist <br /> Site Cleanup Section <br /> Enclosure: Distribution List <br />