LA Times graphic underestimates San Bruno impact radius.

LA Times underestimates San Bruno Blast Zone. 

This graphic was part of a recent feature on San Bruno in the LA Times:

http://www.latimes.com/local/la-me-san-bruno-fire-explosion-htmlstory.html

Yet page 19 of the NTSB report shows the actual data.
http://www.ntsb.gov/doclib/reports/2011/par1101.pdf

So this begs a couple of questions:

1. What did LA Times use as a data source for their graph if it wasn't the NTSB report?
2. Why would the underestimate the Impact Radius of San Bruno by nearly 1/2?

Here is an animation showing how far off the LA Times was.
(The added black dots were used for alignment purposes between the two maps).