CORRESPONDENCE_4/7/22 [REV] APPENDICES W/FIRE PERMIT

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Forward Resource Recovery Facility WDR Technical Report HDR Engineering, Inc. 5 October 2021 2.0 Site Condition Information 2.1 Climatology The Stockton Airport weather station, located roughly two (2) miles northwest of the facility, recorded temperature and precipitation data from 1948 to present and is used to represent climate trends for the facility. The climate of the region is typical of the California Central Valley. Winters are generally cool and wet with fog, while summers are hot and dry. Temperature For data collected from 1948 to 2016, the mean annual temperature is 61.5℉, mean annual maximum temperature is 74.5℉, and mean annual minimum temperature is 48.5℉. As reported in the Forward Landfill’s Joint Technical Document (JTD), summer high temperatures often exceed 100℉, with temperature variation as high as 30℉. Average high temperatures during the winter are in the 50’s, while the average daily low temperature is approximately 45℉. Precipitation The average annual rainfall as reported at the Stockton Airport weather station is 13.76 inches, where most rainfall occurs throughout November to April. As denoted in the site’s WDR R5-2014- 0006 (site WDRs), the facility receives an average of 13.31 to 14.35 inches of precipitation per year as measured at the site. According to the Stockton Airport weather station, the maximum amount of rainfall recorded in one month was 8.23 inches in February 1998. The maximum annual rainfall (dating as far back at 1948) occurred in 1983 with a record 26.67 inches; the minimum annual rainfall occurred in 2013 with a total precipitation of 4.61 inches. Evaporation In accordance with the site WDRs, the estimated annual evaporation for the site is 78.43 inches based on Pan A evaporation data recorded between 1919 and 1968 at Oakdale Woodward Dam (Station No. B00630500, latitude 37°51'28", longitude 120°52'42", Elevation 215 feet amsl), located approximately 13 miles southeast of the site (California Department of Water Resources, 1979). A minimum mean monthly evaporation of 1.14 inches has been calculated for December and January, and a maximum mean monthly evaporation of 14.69 inches has been calculated for July. Storm Event Size According to the National Oceanic and Atmospheric Administration (NOAA), the 25-year, 24-hour design storm event in the facility’s location is 2.83 inches, and the 100-year, 24-hour storm event is 3.57 inches. The above climate data is consistent with the data presented in Forward Landfill’s JTD. This document is hereby incorporated by reference. The above information was gathered from the following sources in addition to the JTD: Stockton Average Temperatures and Precipitation Western Regional Climate Center https://wrcc.dri.edu/cgi-bin/cliMAIN.pl?ca8558 Stockton Weather Data NOAA, National Centers for Environmental Information, CDO https://www.ncdc.noaa.gov/cdo-web/datasets/GSOY/stations/GHCND:USC00041758/detail