A Monday evening workshop on a Carroll sanitary sewer rate study brought forth several different issues as the city plans for future services. Olivia Patton, a civil and environmental engineer with the study’s author, Veenstra & Kimm, Inc., presented the findings to council members. She says historically, Carroll has generated enough revenue from sanitary sewer rates to cover expenses. However, that is going to change with the need to pay for anticipated capital expenses. One of the issues at hand is how to bring more equity to the distribution of revenue between residential and commercial users and industrial. It appears the two industrial users were not included in the last rate increase. Patton identified ways the council could create more equity in that distribution. Four options were presented. If rates were calculated on organic load, with residential/commercial paying 75 percent and industrial 25 percent, or by flow, residential and commercial at 90 percent and industrial at 10 percent, it would put a heavy load on industrial users with percentage of rate increases ranging from just over 215 percent to around 700 percent. The other two options would look at percentage increases to residential and then having industrial fill the gap.