I just spoke with Clay and he asked me to provide you with the following
commentary:

 

The actual pier depth for those piers specified to be founded in gray
shale can vary as much as one foot, plus or minus.  It is my opinion the
variation is insignificant, however, it can vary.  We profiled the gray
shale strata based on available pier drilling logs when calculating the
pier lengths as I provided in the quantities you requested.  Therefore,
I am confident in my statement that the variation in the total pier
quantities I provided is as accurate as the data we utilized from the
subsurface borings.

 

The significant variation in the pier construction process will be the
use of casing if necessary.  That eventuality should certainly be bid on
an add unit cost basis.

 

Clay has stated that it is his opinion the contractor's will "protect"
themselves as much as perhaps 30% with the knowledge that the pier
quantities are based on an estimate of the exact location of the gray
shale.  He has stated that it is in the Town's best interest to bid the
piers on a unit cost basis to avoid the propensity for the contractors
to pad their lump sum pier bid.

 

Victor Lissiak, P.E.

Viewtech Inc

4205 Beltway Drive

Addison, TX  75001

972-661-8187 voice

972-661-8187 fax