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STATEWIDE SANITARY SEWER SYSTEMS GENERAL ORDER <br />o Sea level rise impacts including flooding, coastal erosion, seawater intrusion, <br />tidal inundation and submerged lands; <br />o Increased surface water flows due to higher intensity rain events; <br />o Flooding; <br />o Wildfires and wildfire induced impacts; <br />o Earthquake induced damage; <br />o Landslides; and <br />o Subsidence. <br />• Infrastructure deficiencies and failures, including but not limited to: <br />o Pump station mechanical failures; <br />o System age; <br />o Construction material failures; <br />o Manhole cover failures; <br />o Structural failures; and <br />o Lack of proper operation and maintenance. <br />Insufficient system capacity (temporary or sustained), due to factors including but <br />not limited to: <br />o Excessive and/or increased storm or groundwater inflow/infiltration; <br />o Insufficient capacity due to population increase and/or new connections from <br />industrial, commercial and other system users; and <br />o Stormwater capture projects utilizing a sanitary sewer system to convey <br />stormwater to treatment facilities for reuse. <br />• Community impacts, including but not limited to: <br />o Power outages; <br />o Vandalism; and <br />o Contractor -caused or other third party -caused damages. <br />3.2.4. Underground Sanitary Sewer System Leakage <br />Portions of some sanitary sewer systems may leak, causing underground exfiltration <br />(exiting) of sewage from the system. Exfiltrated sewage that remains in the underground <br />infrastructure trench and/or the soil matrix, and that does not discharge into waters of <br />the State (surface water or groundwater) may not threaten beneficial uses. <br />Underground exfiltrated sewage may threaten beneficial uses if discharged to waters of <br />the State. Exfiltrated sewage that discharges to groundwater may impact beneficial <br />uses of groundwater and pollute groundwater supply. Additionally, if in close proximity, <br />exfiltrated sewage may enter into a compromised underground drainage conveyance <br />system that discharges into a water of the United States, or into groundwater that is <br />hydrologically connected to (feeds into) a water of the United States, thus potentially <br />causing: (1) a Clean Water Act violation, (2) threat and impact to beneficial uses, and/or <br />(3) surface water pollution. <br />ORDER 2022-0103-DWQ <br />December 6, 2022 <br />13 <br />