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M-10A Investigation Work Plan Addendum October 28, 2011
<br /> Nest/6 USA,Inc.,Ripon, California
<br /> 3.1.2 Phase II
<br /> Phase II will commence following analysis of sampling results from Phase I. This phase of the
<br /> CPT investigation will involve drilling and sampling in the target zone(s)at the step-out locations
<br /> spaced approximately 200 feet to the west and northwest (Figure 2). As with the Phase I CPT
<br /> locations, a corresponding sample boring will be drilled adjacent to each CPT boring once target
<br /> zones are identified. Groundwater samples will be collected in target zone(s) and an expedited
<br /> laboratory tum-around time will be requested. ECM will base the Phase II CPT locations on the
<br /> extent of COC's identified in each Phase I boring location, and the predominant groundwater
<br /> flow direction. The CPT locations will be placed on a 100-foot to 200-foot spacing and will be
<br /> located along City of Ripon rights-of-way, if possible.
<br /> ECM will evaluate the sampling results from step out CPT locations to determine if additional
<br /> sampling is needed or desirable. If it is determined that additional sampling is warranted
<br /> outside the Phase I and Phase II borings identified in this Work Plan, ECM will consult with the
<br /> RWQCB for additional proposed locations.
<br /> ECM will conduct soil and groundwater drilling and sampling in accordance with the 2010 M-
<br /> IOA Investigation Work Plans.
<br /> 4 REPORTING
<br /> At the conclusion of the final phase of field work, ECM will prepare and submit an Investigation
<br /> Report to the RWQCB within 60 days from the completion of field work. The report will include
<br /> boring logs, tabulated analytical results, a map showing all boring locations, a description of any
<br /> modifications made to this initial Work Plan, conclusions, and recommendations.
<br /> 5 ENDNOTES
<br /> ECM, 2010. M-10A Investigation Report, Former Nestle USA, Inc. Facility, Ripon, California,
<br /> November 30.
<br /> 2 Geomatrix, 2006. Initial Testing and Characterization Report, In Situ Groundwater Remediation
<br /> Program, Former Nestle Facility, Ripon, California,April 2006.
<br /> 3 Regional Water Quality Control Board — Central Valley Region, 2011. Monitoring Well M-10A
<br /> Investigation Results, and Quarterly Groundwater Sampling Results, Former Nestle USA, Inc.
<br /> Facility, Ripon, San Joaquin County,August 31.
<br /> Regional Water Quality Control Board — Central Valley Region, 2011. Monitoring Well M-10A
<br /> Investigation Results, and Quarterly Groundwater Sampling Results, Former Nestle USA, Inc.
<br /> Facility, Ripon, San Joaquin County,August 31.
<br /> 5 ECM, 2010, M-10A Investigation Report, Former Nestle USA, Inc. Facility, Ripon, California,
<br /> November 30.
<br /> 6 ECM, 2010. M-10A Investigation Work Plan, Former Nest/6 USA, Inc. Facility, Ripon, California,
<br /> June 11.
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