Chapter 15.90 SEWER EXTRA STRENGTH CHARGE This chapter is included in your selections. Sections: 15.90.010 Imposition of Sewer Extra Strength Charge. 15.90.020 Purpose. 15.90.030 Rate Types. 15.90.040 New Development and Redevelopment. 15.90.050 Reclassification Requests. 15.90.060 Appeals. 15.90.070 Enforcement.