DORADO GROUND WATER CONTAMINATION
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The Dorado Ground Water Contamination (DGWC) site (EPA ID No. PRN000201872) consists of a ground water contaminant plume, but the contamination cannot be clearly attributed to any specific source. The plume is located within the municipality (translated from “municipio”) of Dorado in north-central Puerto Rico. The geographic coordinates of the site are 18° 25' 47.12" north latitude (18.42975602°) and 66° 16' 41.95" west longitude (-66.27832042°), based on the location of supply well Maguayo 6 near the center of the area of observed ground water contamination.
There are two active water supply systems in Dorado for which ground water wells are primary contributors: Maguayo and Dorado Urbano, serving populations of 36,630 and 31,061. At least one well in the Dorado Urbano system has also been used to provide emergency water to other areas of the island impacted by drought. There is also an inactive system, Vivoni, which consisted of the Vivoni well located south (i.e., upgradient) of the other wells. These ground water systems are operated as a public utility by Puerto Rico Aqueduct and Sewer Authority (PRASA). Wells in the Maguayo and Dorado Urbano systems have shown detections of volatile organic compounds (VOC), primarily tetrachloroethylene (PCE) and trichloroethylene (TCE), since the 1980s. The U.S. Geological Survey (USGS) reported PCE and TCE detections for samples collected from Maguayo and Dorado Urbano system wells during the period November 1984 to May 1985. PRASA and Puerto Rico Department of Health (PRDOH) documentation indicate detections for the Maguayo and Dorado Urbano system wells for the time period 1996 to 2000. PRASA data sheets for well samples collected from 2002 to 2015 show the ongoing presence of PCE and TCE in Dorado-area ground water. Some reported concentrations have exceeded maximum contaminant levels (MCL), and since the 1990s some wells have been closed either temporarily or permanently.
What Has Been Done to Clean Up the Site?
The Super Aqueduct is being used to supplement the water supply.
What Is the Current Site Status?
As a Fund Lead EPA is working with CDM contractor in the development of RI-FS work plan.
EPA is working on a PRP search, sending a 104e letters to PRPs identified in the HRS Document