On 4/20, SkyTruth Alerts received a report from the NRC that was apparently submitted by Taylor Energy. They reported a spill of 4.72 gallons, with a slick 400 feet by 6.2 miles. Our SkyTruth calculations assuming a minimum average thickness of 1/1000th of a millimeter suggest that this slick held closer to 321 gallons. And the MODIS satellite image for that day shows a slick coming from that location that measured not 6.2 miles long but just over 19 miles long:
On 4/25 the SkyTruth Alerts received another report from the NRC apparently submitted by Taylor Energy. This time the reported spill amount was listed as 5.64 gallons, with a slick of 500 feet by 4.8 miles. Our SkyTruth calculations suggest that this slick holds about 311 gallons. And in that MODIS image, the slick appears to be 19.04 miles long:
The report from the 25th was taken at 9:00 a.m. and the MODIS image that shows the slick was taken about 2 hours later. We don’t think it’s likely that the slick could have grown from 4.8 miles long to over 19 miles long between the time the report was called in and the time the image was taken. It’s possible that under the right conditions satellite imagery is a better tool for detecting and measuring the full extent of a slick than direct observation from aircraft or on the water.