COMPLIANCE INFO_2023 CVRWQCB WASTER DISCHARGE REQUIREMENTS

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DRAFT [TENTATIVE] WASTE DISCHARGE REQUIREMENTS ORDER R5-2023-00XX 15 FORWARD, INC. FORWARD LANDFILL SAN JOAQUIN COUNTY the Oakdale Woodward Dam. The nearest weather station is reflective of conditions at the Facility. 44.WMUs must be constructed to accommodate stormwater runoff from 24-hour precipitation events with a return period of 100 years for Class III WMUs, and a return period of 1,000 years for Class II WMUs (see Title 27, section 20320). According to National Oceanic and Atmospheric Administration’s (NOAA) Precipitation Frequency Atlas 14, Volume 6 (rev. 2014), the Facility’s 100-year and 1,000-year, 24-hour rainfall events are estimated to result in 3.58 and 4.92 inches of precipitation, respectively. Source: NOAA Precipitation Frequency Data Server (https://hdsc.nws.noaa.gov/hdsc/pfds). 45.Stormwater sedimentation basins are situated in the western portion of the Facility, as depicted in Attachment B. A proposed sedimentation basin is permitted in the current entrance and located on the eastern boundary of the Facility. Stormwater from the sedimentation basins is typically evaporated but may be discharged to North or South Forks of South Littlejohns Creek. The Facility is covered under the State Water Board’s operative General Permit for Storm Water Discharges Associated with Industrial Activities, NPDES Permit No. CAS000001 (Industrial General Permit). 46.According to the Federal Emergency Management Agency’s (FEMA) Flood Insurance Rate Map (https://msc.fema.gov/portal), the Facility is not located within a 100-year floodplain, except for the South Fork of South Littlejohns Creek. Per Finding 17 the Discharger is currently realigning South Littlejohns Creek south of the site. The new channel is designed to carry the 100-year flood flows within its banks. Monitoring Networks 47.As of the date of this Order, the Facility’s groundwater monitoring network consists of the existing and proposed monitoring wells listed in Table 3. As noted in Finding 14, with the completion of WMU FU-19 the various landfill units are considered contiguous units for the purposes of groundwater monitoring (Title 27, sec. 20405, subd. (b)). See Monitoring Network Map in Attachment D. 48.Any additional groundwater wells installed as part of an investigation or for any other reason shall be sampled quarterly for the parameters and constituents listed in Table I of the MRP until they are either abandoned with concurrence of Water Board staff or they are incorporated into a regular monitoring program as part of a revised MRP.