ARCHIVED REPORTS_NOTICE OF INTENT FOR INSTALLATION, OPERATION AND MAINTENANCE OF AN OZONE INJECTION GROUNDWATER REMEDIATION SYSTEM

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1 ' Attachment B: Report of Waste Discharge t The NOI has been written to address the additional information requirements contained in Attachment B of the Central Valley Regional Water Quality Control Board(CVRWQCB)Order No.R5-2008-0149. A and B: Final Approved Work Plan and/or Remedial Action Plan. On November 11, 2009, Geocon Consultants, Inc. submitted to the CVRWQCB a Corrective Action Plan (CAP) containing conceptual drawings and specifications for installing, operating and ' maintaining an ozone injection groundwater remediation system for the Site. The CVRWQCB conditionally approved the CAP pending the submittal of this NOI in a November 25, 2009, directive. Copies of Geocon's CAP and the CVRWQCB's Approval Letter are included in ' Appendix A. C: Location The Site is located in Section 20 (?), Township 1 North, Range 6 East on USGS 7.5-minute ' Quadrangle Sheet titled Stockton West. The approximate location of the Site is depicted on the Vicinity Map, Figure 1. The Site consists of a vacant, irregularly shaped parcel, located in downtown Stockton. A former remediation compound is located in the central portion of the Site. ' The perimeter of the Site is enclosed by chain link fence. The Site boundaries and existing Site features are depicted on the Site Plan,Figure 2. The Site is bounded to the west by North American Street as well as private residences, to the north by East Lindsay Street, to the east by commercial ' businesses including A-One Auto Repair and Stockton Clutch and Brake, and to the south by East Miner Avenue. The Site and relative adjacent properties are shown on the Area Map, Figure 3. The Site is owned by the State Controller's Office and is currently undeveloped and vacant. ' D: Pilot Scale Testing Air-sparge (AS) and ozone-sparge (OS) pilot testing results were presented in Geocon's Air-Sparge ' and Ozone-Sparge Pilot Test Report dated July 2, 2009, a copy of which is presented in Appendix B. E: Geology/Hydrogeology t The Site is located in the San Joaquin sub-basin of the Great Valley Sequence. The Great Valley is composed of a thick sequence of sedimentary formations derived from the erosion of the ancestral Sierra Nevada mountain range to the east. Geologic maps from the United States Geological Survey ' show that the Site overlies alluvial soils associated with the Calaveras River from the Holocene and the upper Pleistocene. The site-related boring logs show silty sand with gravel fill covering the Site extending from the ground surface to between 1.0 and 1.5 feet. Alluvial soils consisting of moist, firm, clay and clayey silts underlie the fill to approximately 25 feet. From 25 feet to the deepest explored depth of approximately 120 feet, discontinuous lenses of silty sand and sand are alternately developed within the clay and silty clay matrix. At least three sand lenses have been identified ' during investigations at the Site with monitoring wells completed within each of these zones. The shallow zone extends from approximately 25 feet to 60 feet; the intermediate zone extends from approximately 60 to 75 feet; and deep zone extends from approximately 110 to 120 feet. Additional ' information including site-related boring logs and geologic cross-sections are included in the CAP (Appendix A). F and G: Groundwater and Water Quality Information The site-related groundwater monitoring wells are completed in at least two separate saturated sand lenses referred to as the shallow zone (MW-1 through MW-7, GWX-1 and VX-1), the intermediate zone (MW-8, MW-10 and MW-12) and the deep zone (MW-9, MW-11 and MW-13). The ' intermediate zone is the same saturated sand lens as the shallow zone but with the wells screened at the base of the sand lens rather than across the top of the lens.