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Sewer Utility Finances & Rates 65
<br /> Water & Sewer Financial Plans & Rate Studies
<br /> Wastewater strength estimates for Class B – Low Strength are based on the SWRCB’s
<br />strength estimates for offices and schools. Wastewater strength estimates for Class C –
<br />Standard Strength are based on the average of SWRCB’s strength estimates for retail stores
<br />and professional offices. Wastewater strength estimates for Class E – High Strength are
<br />based on the average of SWRCB’s strength estimates for restaurants and markets with
<br />garbage grinders. Wastewater Strength estimates for Class D‐ Mod‐High Strength are based
<br />on the average of the strength estimates for Class C – Standard Strength and Class E‐ High
<br />Strength.
<br /> The City provides service to a very limited number of industrial accounts. A large share of
<br />industrial wastewater flow is used as process flow and is not returned to the sewer system.
<br />Wastewater strength estimates for Class A – Standard Strength, Low Flow are based on the
<br />same wastewater strength concentrations as the Class C – Standard Strength classification
<br />and assume 65% of metered water use is returned to the sewer system.
<br />
<br />Table S10: Sewer Loadings for Cost Recovery, 2018/19
<br />
<br />Class A includes accounts currently classified as Industrial accounts.
<br />Class B includes accounts currently classified as Institutional/Public accounts.
<br />Class C includes accounts currently classified as Retail/Commercial accounts and Hospitals.
<br />Class D is a new sewer customer class for accounts with moderate‐high wastewater strength; no customers are
<br />currently assigned to this rate class.
<br />Class E includes accounts currently classified as Restaurants and Supermarkets.
<br />
<br />
<br />Sewer UnitsEst. Flow
<br />with GrowthPer UnithcfmggpdBODSSBODSS
<br />RESIDENTIAL Dwelling Units
<br />Single Family & Residential with 2‐9 Units19,6007.51,764,0001,319.563,615,2332502502,751,2832,751,283
<br />Multi‐Family with 10+ Units9,200 4.5496,800 371.63 1,018,168 250 250 774,851 774,851
<br /> Subtotal28,8002,260,8001,691.194,633,4012502503,526,1343,526,134
<br />NON‐RESIDENTIAL Accounts
<br />Class A ‐ Standard Strength Low Flow12varies6,5274.8813,3761401205,7014,886
<br />Class B ‐ Low Strength101varies72,74654.42149,0901308059,00036,308
<br />Class C ‐ Standard Strength1,040varies426,670319.17874,439140120372,663319,426
<br />Class C ‐ Mod‐High Strength ‐ ‐ ‐ ‐ ‐ ‐‐‐ ‐
<br />Class E ‐ High Strength100varies39,449 29.51 80,848 900 700 221,500 172,277
<br /> Subtotal1,253545,391407.981,117,754 194157 658,863532,897
<br />TOTAL30,0532,806,1912,099.175,751,155 239232 4,184,9974,059,031
<br />Projected Wastewater FlowStrength (mg/l)Loadings (lbs)
<br />6.4.A. - Page 92
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