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The Cidra Ground Water Contamination site consists of a ground water plume of VOCs contamination. Puerto Rico Department of Health (PRDOH) ordered the following four public supply wells in Cidra, Puerto Rico to be closed due to contamination by tetrachloroethylene (PCE):.Cidra Well 4 (Calle Padilla Final) in March 1996; Cidra Well 8 (Frente Cementerio) in October 1996; Cidra Well 3 (Planta Alcantarillado) in February 1999; and Cidra Well 6 (Calle Baldorioty) in August 2000. Other chlorinated volatile organic compounds (VOCs), including 1,1-dichloroethylene (1,1 -DCE) and trichloroethylene (TCE), were also detected in the wells before they were closed. Cidra Ground Water Contamination site is located in Cidra, Puerto Rico

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What Has Been Done to Clean Up the Site?

Public Supply wells were placed out of service and a RI/FS was  conducted to determine magnitude and extent of contamination and determine the need to implement remedial action alternatives. A RI/FS was conducted and a ROD signed in 2014.  The selected remedy will address the soil and groundwater contamination detected at the Site protective of human health and the environment.

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What Is the Current Site Status?

EPA conducted  a Fund Lead Remedial Investigation/FeasibilityStudy in order to determine the magnitude and extent of the contamination and to identified potential responsible parties. Water supply wells were closed after a survey detected contamination. A ROD was signed in September 30, 2014.  Under the selected remedy, soil contamination will be addressed at the IDC and the Ramallo Properties by using soil vapor extraction, excavation, disposal and containment. Groundwater contamination under and downgradient of the Ramallo Property will be addressed by implementing an in-situ treatment remedy to remove volatile organic compounds (VOCs), coupled with long-term monitoring.  Currently EPA is conducting three RDs at the Cidra Site (IDC, RAmallo and the GW).ta taS.

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Sampling and Monitoring

The nature and extent of contamination in Site media was assessed during the RI by collecting and analyzing samples and then comparing analytical results to federal, Commonwealth, and Site-specific screening criteria.  Five chemicals were identified as Site-related contaminants: PCE, TCE, cis-1,2-DCE, 1,1-DCE, and vinyl chloride. These chemicals were chosen based on the frequency and magnitude of screening criteria exceedances and previous detections in the supply wells. These chemicals also represent degradation products of chlorinated solvents.

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