--- title: RJN’s Karol Giokas Contributes to Manhole Rehab Factsheet description: Downloadable sanitary sewer manhole rehabilitation resource on materials and methods for renewal. image: https://www.rjn.com/hubfs/Website%20-%20Knowledge%20Hub/MH_Rehab_WEF_NASSCOfactsheet.jpg --- [Home ](https://www.rjn.com) [Knowledge Hub](https://www.rjn.com/blog) # RJN's Karol Giokas is a Contributing Author of Manhole Rehab Factsheet Sewers ![](https://www.rjn.com/hubfs/Website%20-%20RJN%20Experts/Karol%20Giokas%20392%20x392.jpg) [Karol Giokas, PE](https://www.rjn.com/blog/author/karol-giokas-pe) Ms. Giokas offers a diverse engineering background in wastewater collection sy...   The Sanitary Manhole Rehabilitation Fact Sheet was created by a joint team of wastewater engineering professionals, including RJN’s Karol Giokas, PE, the [Water Environment Federation](https://www.wef.org/about/about-wef/), and the [National Association of Sewer Service Companies](https://nassco.org/). This fact sheet is a quick reference for comparing rehabilitation alternatives for sanitary sewer structures and contains an overview of materials, applications, and best practices for manhole repair or rehabilitation. [![Email Francisco Sobral](https://no-cache.hubspot.com/cta/default/6870331/ab6f0d4d-a152-452b-813f-559b2a8d1010.png)](https://cta-redirect.hubspot.com/cta/redirect/6870331/ab6f0d4d-a152-452b-813f-559b2a8d1010)   Karol was a major contributor to the development of this fact sheet. She has led hundreds of municipal sanitary sewer improvement projects throughout the Midwest over her three-decade-long career. In addition, she’s played a key leadership role in RJN’s adoption of innovative tools and technologies for manhole condition investigation, defect analysis, and asset management modeling to enhance infrastructure evaluation and planning programs. Her insights and technical acumen are compounded with other industry thought leaders and will help you focus your rehabilitation program efforts to make them successful. Copyright © 2022 by the Water Environment Federation. All Rights Reserved. Permission to copy must be obtained from WEF.     ##### Share the Publication ##### Expert ![](https://www.rjn.com/hubfs/Website%20-%20RJN%20Experts/Karol%20Giokas%20392%20x392.jpg) [Karol Giokas, PE](https://www.rjn.com/blog/author/karol-giokas-pe) Ms. Giokas offers a diverse engineering background in wastewater collection sy... ##### Popular Publications [Bloomington AVA Award](https://www.rjn.com/blog/bloomington-ava-award) By [Francisco Sobral](https://www.rjn.com/blog/author/francisco-sobral) [Avoiding the Perils of CIPP While Maximizing Its Benefits](https://www.rjn.com/blog/perils-of-cipp) By [Zach Matyja, PE | Regional Account Manager](https://www.rjn.com/blog/author/zach-matyja) [50 Years of Intuition, Innovation, & Insights](https://www.rjn.com/blog/since75) By [RJN Group, Inc.](https://www.rjn.com/blog/author/rjn-group-inc) ## Let’s Discuss Your Project Schedule Consultation