Data from the surveys can be found at:
Message from DOTD below:
STATE OF LOUISIANA
DEPARTMENT OF TRANSPORTATION AND DEVELOPMENT
P.O. Box 94245
Baton Rouge, Louisiana 70804-9245
October 4, 2012
S.P. NO. 30000920
NAPOLEONVILLE SALT DOME
ROUTE LA 70
The Location and Survey Section of DOTD has been conducting surveys along La. Hwy. 70 for the purpose of detecting any possible movement in the roadway. To date four surveys have been conducted on points that were set for this purpose. The resulting data from the four surveys has been entered into an automated spreadsheet that compares coordinate and elevation values of each survey to the first survey.
DOTD survey crews began preparations to conduct the surveys on 08-06-12 setting the control points necessary to conduct the surveys, establishing the coordinates and elevations of the control points and setting the points that would be monitored.
The first survey was completed on 08-15-12 which is the benchmark survey to which the subsequent surveys are being compared. The subsequent surveys were completed on 08-22-12, 09-19-12 and 09-25-12.
Additional surveys will be conducted and the resulting data will be compared to the benchmark survey data.
At this time, the data comparisons do not indicate to us that there is any detectable movement in the roadway. The small differences we see in the data appear to us to be normal survey error which is typical in survey measurements. We have made our survey data available to the scientific community for their assessment.
HUNTINGTON HODGES, P.L.S.
ASSISTANT LOCATION AND SURVEY ADMINISTRATOR