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Geomatrix <br /> SOIL INVESTIGATION WORK PLAN <br /> MonierLifetile, LLC Lathrop and French Camp Facilities <br /> Lathrop and French Camp, California <br /> 1.0 INTRODUCTION <br /> Geomatrix Consultants, Inc. (Geomatrix) has prepared this Soil Investigation Work Plan (Work <br /> Plan) on behalf of MonierLifetile LLC (MonierLifetile) to present the proposed scope of work <br /> for the drilling and sampling of soil at MonierLifetile's Lathrop and French Camp Facilities <br /> (the Facilities) located in Lathrop and French Camp, California(Figure 1). The French Camp <br /> facility is located approximately 6 miles south of Stockton, California; and the Lathrop Facility <br /> is located approximately'/2 mile south of the French Camp Facility. <br /> This Work Plan was prepared in response to a request made by the Central Valley Regional <br /> Water Quality Control Board (RWQCB) in its October 4, 2005 letter to MonierLifetile. In the <br /> letter, the RWQCB requested the submittal of a work plan outlining a time schedule to <br /> investigate the extent of diesel impacts to soil and groundwater underlying the broken and <br /> uncured roof tile stockpiles by November 15, 2005, and the subsequent submittal of a report <br /> summarizing the investigation findings to the RWQCB by February 15, 2006. I In addition to <br /> the tasks requested by the RWQCB, this Work Plan includes a scope of work to complete the <br /> vadose zone soil investigation beneath the stockpiles at each Facility as required in the existing <br /> Cleanup and Abatement Order No. 5-01-722. <br /> 2.0 BACKGROUND <br /> Based on an initial detection of chromium (Cr) and hexavalent Cr(Cr VI) from a one-time <br /> collection of groundwater screening samples in 2001 (Brown and Caldwell, 2001), the <br /> RWQCB requested further evaluation of the groundwater conditions at the Facilities in the <br /> vicinity of the stockpiles. The stockpiled material consists of broken and uncured roof tile <br /> material (URS Corporation [URS], December 2005). <br /> A Cleanup and Abatement Order No. 5-01-722 (Order) was issued to MonierLifetile by the <br /> Central Valley RWQCB on October 15, 2001. Pursuant to the Order, a groundwater <br /> monitoring system was installed at each Facility as described in the Groundwater Monitoring <br /> Plan (GMP) and Addendum (Brown and Caldwell, 2002). The groundwater monitoring system <br /> was proposed to further assess groundwater quality, flow direction, and site specific <br /> PAI 0626.000.0\Docs\MI.T Soil Work Plan.doc 1 <br />