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Final Operations and Maintenance Plan <br /> Neighborhood C,Great Valley Parkway <br /> Mountain House,San Joaquin County,California <br /> Page 1-1 <br /> OPERATIONS AND MAINTENANCE PLAN <br /> NEIGHBORHOOD C <br /> GREAT VALLEY PARKWAY <br /> MOUNTAIN HOUSE,SAN JOAQUIN COUNTY,CALIFORNIA <br /> January 2017 <br /> 1.0 INTRODUCTION <br /> As part of the development of Mountain House,the land developers evaluated historic land use practices <br /> during the entitlement process. The southern portion of Neighborhood C was found to contain residual <br /> concentrations of a legacy pesticide, dieldrin, at concentrations above sensitive land use screening <br /> concentrations in shallow soil. Dieldrin is a chlorinated pesticide considered to be a probable human <br /> carcinogen. A Removal Action Workplan' (RAW) was developed in 2007 to remove dieldrin-containing <br /> soil and place it beneath an arterial roadway in Neighborhood C. <br /> 1.1 PURPOSE <br /> This Operations and Maintenance Plan has been prepared at the request of California Department of <br /> Toxic Substance Control (DTSC). In 2013, dieldrin-containing soil was removed from the southern <br /> portion of Neighborhood C and placed in a pre-excavated encapsulation trench located beneath the <br /> southbound lanes of Great Valley Parkway(Site,Encapsulation Area).The purpose of this document is to <br /> present the procedure for the long term monitoring and maintenance of the Site. <br /> Completion of soil removal and encapsulation activities were described in the Removal Action <br /> Completion Report dated October 4, 2016. The removal and encapsulation activities were performed as <br /> described in the RAW dated July 9,2007 by Condor Earth Technologies, Inc.(Condor). Site investigation <br /> and cleanup activities were performed under a voluntary cleanup agreement (VCA) (HAS-VCA 06/07- <br /> 147-2A)between DTSC and Shea Mountain House,LLC(Shea). <br /> 1.2 SITE BACKGROUND <br /> Dieldrin was found to be present at elevated concentrations in the southern portion of Neighborhood C <br /> within the former Silva property. Shea entered into a VCA with DTSC in 2007 to engage DTSC oversight <br /> of remediation of the dieldrin-containing soil. The selected remedy was soil removal and encapsulation <br /> beneath the southbound lanes of Great Valley Parkway, between Mustang Way and Grant Line Road <br /> (Figure 2). <br /> The project proponent entity subsequently changed from Shea to Mountain House Developers, LLC <br /> (MHD). In 2013, Condor conducted environmental services for MHD in accordance with the RAW, <br /> including documentation of remediation activities, air monitoring, and soil sampling which has been <br /> documented in the Removal Action Completion Report, Neighborhood C (Hansen Village), Mountain <br /> House, San Joaquin County, California, dated October 4, 2016 prepared by Condon. The cleanup goal <br /> was 0.035 mg/kg dieldrin for the removal area. The laboratory analytical results for a total of 62 final <br /> 1 Removal Action Workplan,Southern Portion of Neighborhood C,Assessor Parcel Number 209-450-03 and a Portion of 209- <br /> 450-02,Mountain House,San Joaquin County, California.July 9,2007,Condor Earth Technologies,Inc.available online at: <br /> http://www.envirostor.dtsc.ca.gov/public/final_documents2.asp?global_id=60000564&doc_id=6015116 <br /> Z RACR available online at: <br /> http://www.envirostor.dtsc.ca.gov/public/ftnal_documents2.asp?global_id=60000564&doc_id=6033 8 885 <br /> IL 4) CONDOR <br />