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STATEWIDE SANITARY SEWER SYSTEMSGENERAL ORDER2022-0103-DWQ 2.SPILL-SPECIFIC MONITORING REQUIREMENTS 2.1Spill Location and Spread TheEnrolleeshall visually assessthespill location(s)andspreadusing photography, global positioning system(GPS), and other best available tools.The Enrollee shall document the critical spilllocations, including: Photographyand GPS coordinates for: o Thesystem location where spill originated. For multiple appearance points of a single spillevent,the points closest to the spill origin. Photographyfor: o Drainage conveyance system entry locations, o The location(s) of dischargeinto surface waters, as applicable, o Extentofspillspread,and o The location(s) of clean up. 2.2Spill Volume Estimation To assess the approximate spill magnitudeand spread, theEnrolleeshall estimatethe totalspillvolume using updated volume estimation techniques, calculations, and documentation for electronic reporting.TheEnrolleeshall update its notification and reporting of estimated spillvolume (which includes spillvolume recovered) as further information is gathered during and after a spillevent. 2.3. Receiving Water Monitoring 2.3.1.Receiving Water Visual Observations Through visual observations and use of best available spillvolume-estimating techniquesand field calculationtechniques, the Enrollee shall gatherand documentthe following information for spills discharging to surface waters: Estimatedspilltravel time to the receiving water; For spills entering a drainage conveyance system,estimatedspilltravel time from the point of entry into the drainage conveyancesystemto the point of dischargeinto thereceiving water; Estimatedspill volume entering the receiving water;and Photographyof: o Waterbody bank erosion, o Floating matter, o Water surface sheen (potentially from oil and grease), ATTACHMENT E1NOTIFICATION,MONITORING,REPORTING AND RECORDKEEPINGREQUIREMENTSDecember 6,2022 E1 -5