Diamond Appraisers Diamond Appraisers. and IGS Inc. are not responsible for any errors or omissions that may occur in the names or the addresses of the. News Triad Engineering, Inc. Wenger to Lead SMPS Central PA Board of Directors Triad Business Development Leader Wenger has been elected to serve as President of the Society for. Frederick County, land Wikipedia Frederick County is Pleasant-Valley a county located in the northern part Gretna of Hawesville the Whitefield U.S. state of land. As of theU.S. Census, the population was 240,336. The county seat is.