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contact between 89 and 109 feet below ground surface. To investigate the possibility that <br /> TCE concentrations in shallow groundwater exist in this area, Nest1E should additionally <br /> collect groundwater samples from within sandy layers above the clay layer. <br /> 2) In Section 3.4 .1 of the Work Plan, Nestlb proposes to screen soil core intervals with <br /> a photoionization detector from the surface to the water table, the clay layer between <br /> approximately 40 to 50 feet below ground surface, and the sandy layer between <br /> approximately 50 to 60 feet below ground surface. However, the interval between the water <br /> table and the top of the clay at approximately 40 feet below ground surface should also be <br /> screened since TCE may be present within the saturated soils. <br /> 3) The Work Plan references a clay layer at 50 to 60 feet below ground surface twice on <br /> page 5 and once on page 7. It appears that the clay layer referenced on these pages is <br /> actually between approximately 40 to 50 feet below ground surface. If this is not the <br /> case, Nestl@ should so indicate in writing to Regional Water Board staff. <br /> 4) Nestle should identify parameters for base line groundwater or soil sampling that <br /> would be needed for various active, in situ remediation technologies with potential for <br /> use at the Former Facility. <br /> If you have any questions, please call me at (916) 464-4675, Jim <br /> 2 <br />