Hazardous waste management 2

Hazardous waste management 2 - Nathan Rosenberg CE 70 Site...

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Nathan Rosenberg CE 70 Site Assessment Tutu Well field The 108 acre Tutu Well field site, in a mountainous area of eastern central St. Thomas, U.S. Virgin Islands, consists of groundwater contamination from both known and unknown sources. In July 1987, residents began noticing a strong petroleum odor in the Tillet well, one of several commercially owned supply wells in the area. At that time, the well was used as a public drinking water source throughout the island. The Virgin Islands Department of Planning and Natural Resources (VIDPNR) requested that the U.S. Environmental Protection Agency (EPA) test the Tillet well and a few other wells in the area. Beginning in July and continuing through September of 1987 the EPA sampled approximately 24 wells and 123 cisterns [1]. Volatile and chlorinated hydrocarbons including benzene, toluene, 1,2-trans-dichloroethene (DCE), trichloroethene (TCE), and tetrachloroethene (PCE) were found in several of the wells [1]. The different types of wells included institutional wells, public supply wells, commercial wells, and private domestic wells. VIDPNR immediately issued an Administrative Order of Consent to the Tutu Texaco Service Station in order to investigate petroleum release from their underground storage tanks. Texaco was also ordered to stop all work which could further disturb the potentially contaminated area. In 1987, Esso Tutu Car Care Center was also issued a similar Administrative Order. On February 19, 1992, the Tutu Environmental Investigation Committee (comprised of Texaco Caribbean Inc. and Esso Virgin Island, Inc.) signed an agreement with EPA to perform a Remedial Investigation/Feasibility Study (RI/FS) at the Tutu Well field site [1]. The Tutu Well field site was proposed to
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EPA's National Priorities List (NPL) in February 1992. The NPL is the federal list of hazardous waste sites that are able to receive Superfund cleanup dollars. In June 1993, EPA identified 9 Potentially Responsible Parties: 1. Tutu Texaco Service Station The Tutu Texaco service station has been in operation since 1964 selling gasoline and diesel fuel and servicing automobiles. It is located north of the Tillett well on Highway 38. This facility contributed to groundwater contamination through both unleaded and leaded gasoline underground storage tanks (UST's). Three 4,000 gallon gasoline UST's were taken out of service in 1980 due to suspected leaks and integrity test failure. Those three tanks were removed in September 1988. Large and small holes were discovered in the tanks during the investigation. Strong odors of petroleum hydrocarbons and air readings above background were detected during the excavation [1]. 2. Esso Tutu Service Station The Esso Tutu car care center has been in operation since 1970 selling gasoline and servicing automobiles. It is located southwest of the Tillett well on Highway 438. This facility has contributed to the groundwater contamination through both leaded and unleaded gasoline UST’s. In 1987, a leak test indicated that the integrity of the unleaded
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Hazardous waste management 2 - Nathan Rosenberg CE 70 Site...

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