A Soil Improvement Primer Mar, 2012 By Carrie Johnson, P.E., SECB In Articles, Structural Practices Comments 0 This article is currently only available in PDF format, please click the link to the top right. About the author ⁄ Carrie Johnson, P.E., SECBCarrie Johnson, P.E., SECB, is a principal at Wallace Engineering Structural Consultants, Inc., Tulsa OK. Prev Role of BIM in Infrastructure Seismic Retrofits Next Hybrid-Composite Beam Technology