{"data":{"id":"us-va/9vac25-790-960","jurisdiction":"us-va","citation":"9VAC25-790-960","heading":"Influent and effluent sampling","body":"A. Sampling tests and frequency. Table C lists the typical recommended minimum sampling program schedules for all sewage treatment works (STW).\n\nB. STW effluent tests and frequency of effluent testing and frequency of other sampling for a treatment works will be provided in the VPDES permit or the VPA permit.\n\nTABLE C. TYPICAL SAMPLING PROGRAMS FOR SEWAGE TREATMENT   WORKS.\n\nPLANT SIZE\n\n\u003e2.01 MGD\n\n1.0-2.0 MGD\n\n0.101-0.999 MGD\n\n0.401-0.1 MGD\n\n0.0011-0.04 MGD\n\nFlow\n\nTotalizing, Indicating \u0026 Recording\n\nTotalizing, Indicating \u0026 Recording\n\nTotalizing, Indicating \u0026 Recording\n\nTotalizing, Indicating \u0026 Recording\n\nEstimate\n\nBOD5, TSS, TKN\n\n24- HC\n\n1/ Day\n\n24- HC\n\n5 Days/ Wk\n\n8-HC\n\n3 Days/ Wk\n\n4-HC\n\n1 Day/ Wk\n\nGrab\n\n1/month\n\nTotal Nitrogen* Total Phosphorus*\n\n24- HC\n\n1/ Week\n\n24- HC\n\n1/ Week\n\n8-HC\n\n1/ 2 Weeks\n\n4-HC\n\n1/ Month\n\nGrab\n\n1/month\n\nTRC, Contact tank**\n\nGrab 1/2 Hr\n\n4/Day at 4 Hr.Intervals\n\n3/Day at 4 Hr.Intervals\n\n3/Day at 4 Hr.Intervals\n\nGrab\n\n1/Day\n\nFecal Coliform**\n\nGrab\n\n1/Day\n\n10am-4pm\n\nGrab\n\n5 Days/Wk\n\n10am-4pm\n\nGrab\n\n3 Days/Wk\n\n10am-4pm\n\nGrab\n\n1/Week\n\n10am-4pm\n\nGrab\n\n1/Month\n\n10am-4pm\n\npH, DO, TRC Effluent\n\nGrab\n\n1/Day\n\nGrab\n\n1/Day\n\nGrab\n\n1/Day\n\nGrab\n\n1/Day\n\nGrab\n\n1/Day\n\nWQS Parameters (Toxics)\n\n1/8,24 HC or 1/month\n\n1/8,24 HC or 1/month\n\n1/8, 8HC or 1/month\n\n1/8, 4HC or 1/month\n\nGrab\n\n1/month","path":["Title 9. Environment","Agency 25. State Water Control Board","Chapter 790. Sewage Collection and Treatment Regulations","Part IV. Reports and Forms","Article 1. Reports"],"source_url":"https://law.lis.virginia.gov/admincode/title9/agency25/chapter790/section960/","current_through":"2026 Regular Session (effective July 1, 2026)","vintage":"","retrieved_at":"2026-09-14T04:49:25Z","sha256":"762346c5364edcb14bb8a2f6ba513ded642c96b4b4f7b6e2426f8e88fd9e8d16","source_id":"us-va-vac","stale":false,"prev":"us-va/9vac25-790-950","next":"us-va/9vac25-790-970"},"notice":"GroundRules: Original legal text. Not legal advice."}