The Cooperative PW-00517 for permanent repairs contains a summation error of $25,140; exceeding the questioned cost threshold. The Cooperative submitted various contact invoices and expenses for summation by FEMA representative. The validation summary prepared by FEMA for PW-00517 contained a summation error of $25,140 relating to the SPARKS contract. The Cooperative validation summary for PW-00517 was overstated by $25,140 resulting in overpayment of $22,626 on PW-00517. The Cooperative should review all validation summaries for mathematical accuracy prior to final closeout submission.