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C-SHADSOFS91.1/1.4 <br /> 12/12/91 <br /> Beginning in about 1957, maintenance and repair of fixed-wing aircraft and <br /> helicopters were conducted at SHARPE. The peak period of activity reportedly <br /> occurred in the late 1960s. <br /> The heavy-equipment maintenance function at SHARPE reportedly began in the <br /> early 1950s and continued until 1976. Peak activity for this operation also <br /> occurred in the late 1960s, when several thousand pieces of equipment <br /> reportedly were processed each year. <br /> Previous environmental studies have indicated groundwater contamination with <br /> offpost migration of volatile organic compounds (VOCs). Additionally, arsenic, <br /> selenium, and bromacil have been detected sporadically in groundwater samples. <br /> Available data indicate that the primary source(s) of the VOC contamination is <br /> associated with past mission-related activities (e.g., vehicle maintenance) at <br /> SHARPE. A major area of VOC contamination is the South Balloon Area of <br /> SHARPE; however, other individual source areas may include former burial <br /> trenches and/or several former ground-stained areas. The potential source(s) of <br /> the metals is not readily apparent and may include natural and offsite <br /> contributions as well as onsite sources. <br /> As a result of early investigations conducted at SHARPE, an interim groundwater <br /> extraction and treatment system (referred to as the South Balloon Area <br /> Groundwater Treatment System) has been installed and in operation since March <br /> 1987 to control migration of contaminated groundwater in that portion of the <br /> site. A separate interim RI and FS was also prepared by McLaren Environmental <br /> Engineering of Rancho Cordova, CA, to identify and evaluate interim remedial <br /> action alternatives in the North Balloon Area. As a result of this investigation, a <br /> second interim groundwater pump-and-treat system was constructed in the North <br /> :1 <br /> 1-7 <br />