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DTSC COMMENTS <br /> GROUNDWATER MONITORING WELL INSTALLATION WORKPLAN <br /> FORMER SHELL CENTRAL VALLEY CRUDE OIL PIPELINE <br /> NEIGHBORHOOD C and D <br /> MOUNTAIN HOUSE, CALIFORNIA <br /> The Groundwater Monitoring Well Installation Workplan, Former Shell Central Valley <br /> Crude Oil Pipeline Neighborhood C and D (Monitoring Well workplan) was <br /> developed for Shell Oil Products (Shell) and submitted to the Central Valley <br /> Regional Water Quality Board for review. The Monitoring Well workplan proposed to <br /> install 14 monitoring wells along 5,200 feet of two former Shell Oil Central Valley <br /> Crude Pipelines (pipelines) that transected Neighborhood C and D. DTSC <br /> coordinates with the review of the Monitoring Well workplan because 1 ,000 feet of <br /> the pipeline transected the proposed Mountain House High School site. <br /> The pipelines were located in the residential area known as Mountain House in <br /> Tracy, California. Soil and groundwater contamination were identified when the <br /> pipelines were removed in 1960. A Removal Action Report (SAIC, March 2007) <br /> summarized the removal of 131,228 cubic yards (cy - 17,000 cy from MHHS) of soil <br /> contaminated with total petroleum hydrocarbons (TPH). Soil and soil-gas <br /> confirmation samples were collected to verify that the removal was complete. <br /> The following DTSC staff reviewed and provided comments on the Monitoring Well <br /> workplan. Please contact the Project Manager if you have any questions regarding <br /> the comments. Original comments from the Toxicologist are available for review in <br /> the DTSC project file. <br /> Kamili Siglowide Gabriele Windgasse, Ph.D. <br /> Project Manager Staff Toxicologist <br /> Department of Toxic Substances Control Department of Toxic Substances Control <br /> 8800 Cal Center Drive 8810 Cal Center Drive <br /> Sacramento, California 95826 Sacramento, California 95826 <br /> ksiglowi,cni dtsc.ca.gov gwindgas dtsc.ca.gov <br /> (916) 255-6527 (916) 255-6651 <br /> GENERAL COMMENTS: <br /> 1. DTSC is working with Shea Mountain House LLC to evaluate the proposed Mountain <br /> House High School, located in Neighborhood D, to determine if environmental <br /> hazards exist at the site. DTSC comments on this report are relevant to the extent of <br /> pipeline located on the proposed MHHS site. <br /> 2. All groundwater investigations should be incorporated into a comprehensive report <br /> on the extent of groundwater contamination on the proposed school site. <br />