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Map Key Number of Direction Distance Elev/Diff Site DB Records (mi/ft) (ft) The Tracy Unified School District submitted an Environmental Oversight Program Application (March 29, 2005) to complete a Preliminary Environmental Assessment. No oversight agreement was signed. According to background information (Geological and Environmental Hazards Assessment Report - Condor Earth Technologies, February 18, 2005), the site and the surrounding areas were used for agricultural purposes. Two former Shell Oil Central Valley Crude Pipelines transected the proposed school site for approximately 1,000 feet. Releases were identified when the pipelines were removed in 1960. The Central Valley Regional Water Quality Control Board (CVRWQCB)is overseeing Shell's pipeline investigation, removal and clean-up. In December 2004, Clayton Group Services (Clayton) issued a report to the CVRWQCB that summarized field investigation of Neighborhood C & D. The summary report, "Former Shell Central Valley Crude Lines, Vicinity of Grant Line road and Mountain House Parkway Tracy, California" dated December 16, 2004, reported the following maximum concentrations of: TPH(crude oil) 130,00 mg/kg; TPH(d) 42,00 mg/kg; benzene 0.88 mg/kg; naphthalene 1.7 mg/kg and several other products. Clayton divided the site into 13 areas that needed further delineation; three of the areas are located on the proposed Mountain House High School (MHHS) site. In August 2006, Shell and Science Applications International Corporation (SAIC) excavated 17,000 cubic yards of soil contaminated with total petroleum hydrocarbons (TPH, crude and diesel range) and BTEX (benzene, toluene, ethylbenzene and xylene) from the proposed MHHS. The excavation was backfilled with soil from the general area. Confirmation samples were collected; the maximum detection of TPH-crude and TPH-diesel were 2,400 mg/kg and 1,700 mg/kg respectively. Detections of other chemicals of concern were below the reporting limits. In December 2006, soil gas samples were collected and analyzed for BTEX and naphthalene within and adjacent to the backfilled areas of the former pipeline. Naphthalene was not detected in any of the samples. The maximum detection of benzene on the proposed MHHS was 150 ug/L. A Remedial Action Report (RAR — SAIC, March 2007) was developed on behalf of Shell and submitted to the CVRWQCB for review and comment. DTSC coordinated with CVRWQCB on the review of the 1,000 feet portion of pipeline to ensure that confirmation samples collected were appropriate for site evaluation. The report summarizes background investigation and the results of current soil and soil gas investigation conducted on of 5,200 feet of pipeline. While the report gives an account of the entire 5,200 feet, DTSC focused on the 1,000 feet portion that transects MHHS. The report recommends no further action. The District has chosen not pursue this site further. In an e-mail dated November 17, 2006, Shea Mountain House LLC (Shea) agreed to reimburse DTSC's oversight costs associated with the MHHS project. However, further investigation with respects to site clearance for a proposed school, will require Shea to enter into a Voluntary Cleanup Agreement with DTSC. A Preliminary Environmental Assessment will be required to investigate the MHHS site for residual agriculutral chemicals (organochlorine pesticides and metals) in soils. That project will be under a seperate site code. The District approached DTSC to re-initiate this project in 2007 and a VCA was signed on December 4, 2007. (Envirostor Code 60000759; Site Code 104601). On April 10, 2009, DTSC approved the PEA with a no further action report recommendation. At that time the Project Status was changed to No Further Action. Status: NO FURTHER ACTION A2 Program Type: SCHOOL EVALUATION CalEnviroScreen Score: 76-80% Summary Link: https://www.envirostor.dtsc.ca.gov/public/profile_report?global_id=60000100 COMDleted Activities Title: Background Information -Shell Pipeline Investigation Report Title Link: https://www.envirostor.dtsc.ca.gov/public/final_documents2?giobal_id=60000100&doc_id=6015038 Area Name: Area Link: Sub Area: Sub Area Link: Document Type: Other Report Date Completed: 11/30/2006 Comments: Uploaded Shell Investigation Report for background information. Title: Inactive Letter Title Link: https://www.envirostor.dtsc.ca.gov/public/final_documents2?g(obal_id=60000100&enforcement_id=6008764 Area Name: Area Link: Sub Area: Sub Area Link: Document Type: Inactive Status Letter Date Completed: 1/23/2006 Comments: Title: Status/Cost Reimbursment Request - RP Change Shea Mountain House LLC Title Link: https://www.envirostor.dtsc.ca.gov/publiclfinal_documents2?global_id=60000100&enforcement_id=6011542 Area Name: erisinfo.com I Environmental Risk Information Services Order No: 21080200152