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MWMC WASTEWATER FACILITIES PLAN AND SYSTEM DEVELOPMENT CHARGE UPDATE ~ RESPONSE TO APRIL 2, 2004, QUESTIONS FROM EUGENE CHAMBER OF COMMERCE caused a sharp decline in flows contributed by a few large-volume customers. The closure and scale-back of two major industries in Eugene resulted in a 1.2 mgd (15%) reduction from an 8 mgd base flow of combined commercial/industrial customers. The second factor is the severe drought conditions that have existed in the Willamette Valley over the past several years, as compared to the relatively normal rainfall patterns that occurred in the 1990s. The following table shows the trend in dry season average daily rainfall. The third factor is that I/I reduction efforts implemented over the past several years have been successful in reducing I/I into the collection system during the "dry" weather months of May and October. These months have significant variability in rainfall quantities from year to year and can contribute significant amounts of I/! into the collection system during the dry season. TRENDIN DRYSEASONAVERAGEDAILYRAINFALL Year Average Dally Dry Season Rainfall(in) 1996 .0.06 1997 0.07 1998 0.05 1999 0.04 2000 0.03 2001 0.03 2002 0.02 The following graph shows both historical (previous 12 years) and projected flow through 2025 for residential and commercial businesses, The historical data shows the wide variability in flows over the last 12 years. The data for the last few years shows the combined effect of low rainfall and the loss of a small number of significant customers. This variability is taken into account when projecting future wastewater flows so that communities in the Willamette Valley can provide adequate facilities needed to meet regulations that protect the environment and Public health. CHAMBER OF COMMERCE RESPONSES FINAL. DOC PAGE 2 OF 8