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Recommended Standards and Guidance for Performance, Application, Design, and Operation & Maintenance Recirculating Gravel Filter Systems February 2021 Recommended Standards and Guidance for Performance, Application, Design, and Operation & Maintenance Recirculating Gravel Filter Systems February 2021 For information or additional copies of this report contact: Wastewater Management Program Physical address: 101 Israel Road SE, Tumwater, WA 98501 Mailing Address: PO Box 47824, Olympia, Washington 98504-7824 Phone: (360) 236-3330 FAX: (360) 236-2257 Webpage: www.doh.wa.gov/wastewater Email: [email protected] Umair A. Shah, MD, MPH Secretary of Health To request this document in another format, call 1-800-525-0127. Deaf or hard of hearing customers, please call 711 (Washington Relay) or email [email protected] Para solicitar este documento en otro formato, llame al 1-800-525-0127. Clientes sordos o con problemas de audición, favor de llamar al 711 (servicio de relé de...