ARCHIVED REPORTS_SHEA HOMES CERT LETTER WITH FORM

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Mr. Dave Sargent September 13, 2017 Page 2 that were above concentrations acceptable for an unrestricted land use, which were encapsulated in an internment cell beneath the Great Valley Parkway roadway. The Removal Action Completion Report documents surface soil excavation of approximately 40.6 acres to a depth of 0.5 feet below ground surface to meet the approved remedial goal of 0.035 mg/kg for dieldrin in soil for an unrestricted land use. _ The total in-place volume of soil removed was approximately 70,000 in-place cubic yards. Excavated soil was encapsulated beneath a portion of the Great Valley Parkway along the western boundary of the Site in areas without planned subsurface utilities. The Great Valley Parkway was subsequently paved with asphalt to serve as a roadway. The area with the encapsulated soil. is subject to the LUC. Following implementation of the Removal Action Workplan (RAW), confirmation sampling data from the excavation work demonstrated that the remedial action goal had been achieved on the remainder of the property to allow for an unrestricted land use. On December 20, 2016, DTSC approved the Removal Action Completion Report. A Soil Management Plan (SMP) dated March 2017 for the dieldrin impacted soils contained in the internment cell beneath the Great Valley Parkway, was approved by DTSC in a letter dated March 8, 2017. The approved SMP outlines requirements to be complied with during any activities that disturb soils within the internment cell beneath the Great Valley Parkway. A LUC was recorded on the 2.745-acre portion of Great Valley Parkway lying North of Grant Line Road and South of Mascot Boulevard (AKA - Mustang Way) as shown on San Joaquin Subdivision Map recorded as Tract No. 3649. This LUC was recorded with the San Joaquin County Assessor's office as Document Number 2017-101325 dated September 1, 2017. Please note that the LUC has requirements for submittal of Annual Inspection Reports due on January 15th of each year. Additionally, as identified in the executed Operation and Maintenance (O&M) Agreement, a Five-Year Review report is due every five years after the date the LUC is recorded to evaluate the effectiveness and protectiveness of the remedy. In addition to the LUC, an O&M Agreement and Plan for the dieldrin impacted soils contained in the internment cell beneath the Great Valley Parkway was approved for the site by DTSC on August 31, 2017 along with confirmation that the required financial assurance mechanism required by the O&M was valid and in effect. By this letter DTSC hereby certifies that the remedial actions for the 61-acre Site known as the Shea Homes Neighborhood C Site have been properly implemented. As with any remediation, if previously unidentified contamination is discovered on the property, additional assessment, investigation, and/or remediation may be required. DTSC appreciates the cooperation and efforts that Mountain House Developers, LLC. and their consultants made in completing the Site-related remediation activities described above.