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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2003-0099 ... 4 NEWPORT PACIFIC CAPITAL COMPANY,INC. ARBOR MOBILE HOME PARK WASTEWATER TREATMENT FACILITY SAN JOAQUIN COUNTY update and implement an operation and maintenance manual that includes overflow prevention and response features. SITE SPECIFIC CONDITIONS 25. The mean annual rainfall,based on data from Lodi weather station, is 17.57-inches per year. 26. All portions of the Arbor MHP are outside of the 100-year flood zone. 27. Stormwater that falls on the site is collected and discharged to a stormwater storage pond. 28. The site lies within the Lower Mokelumne Hydrologic Area No. 531.20, as depicted on interagency hydrologic maps prepared by the Department of Water Resources in August 1986. 29. According to the Soil Conservation Service's Soil Survey of San Joaquin County, surface soil at the wastewater treatment facility consists of Kingdon fine sandy loam, alluvium derived from granitic rock sources. 30. The topography of the site and surrounding area is fairly level. Elevation of the site is approximately 60 feet above mean sea level. 31. The Discharger states that groundwater occurs approximately 50 feet below ground surface based on information from a nearby site. 32. Potable water for the MHP is provided by an on-site well. Water quality samples were collected on 30 May 2001. The water quality is summarized in the following table: Constituent Units Concentration Total Hardness mg/L 144 Sodium mg/L 13.7 Chloride mg/L 13.0 Nitrate (as NO3) mg/L 5.4 Electrical Conductivity µmhos/cm 323 BASIN PLAN,BENEFICIAL USES, AND REGULATORY CONSIDERATIONS 33. The Water Quality Control Plan for the Sacramento River and San Joaquin River Basins, Fourth Edition, (hereafter Basin Plan) designates beneficial uses, establishes water quality objectives, contains implementation plans and policies for protecting waters of the basin, and incorporates by reference plans and policies adopted by the State Water Resources Control Board. Pursuant to Section 13263(a) of the CWC,waste discharge requirements must implement the Basin Plan. 34. Surface water drainage from the site is to the Mokelumne River. 35. The beneficial uses of the Mokelumne River from Camanche Reservior to the Sacramento-San Joaquin Delta are: agricultural supply; water contact recreation; non-contact water recreation;