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Covers relevant Washington WAC 246-272A and USEPA Onsite Wastewater Treatment Systems Manual topics, including soil profile understanding, calculations, pump hydraulics, sand media and dosing requirements, and electrical and gravity dispersal components. Includes study resources, inspection and licensing notes, and practical requirements for reports, elevations, bedding, and watertight pipe joints.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/onsite-sewer-system-installation-guide-study-guide/648477/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/onsite-sewer-system-installation-guide-study-guide/648477.png","ImageObject",300,407,{"name":92,"@type":93},"Putri","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-05","2026-10-23",true,{"@type":102,"interactionType":103,"userInteractionCount":19},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What regulations and guidance should installers study for the OSS Installer Exam?","Question",{"text":112,"@type":113},"Installers are directed to WAC 246-272A, relevant recommended standards and guidance documents, and the USEPA Onsite Wastewater Treatment Systems Manual, along with local and referenced handout materials like DOE criteria and UPC excerpts.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What design-plan skills are emphasized in this guide?",{"text":117,"@type":113},"The guide emphasizes understanding site plan elements (location, dimensions, topography), standards and specifications, pump performance and hydraulics, soil profile descriptions, and the ability to perform area/volume/rate calculations and conversions.",{"name":119,"@type":110,"acceptedAnswer":120},"What are the key installation and inspection requirements mentioned?",{"text":121,"@type":113},"Installers must follow the approved design to scale, schedule inspections at least two working days in advance, complete the Installation Report and Record Drawing on site for final inspection, and ensure required system components are inspected and approved before being covered.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},648477,1793048057,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":19,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":46,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":31,"preview_page_count":4},962085571259,"https://ap-avatar.wpscdn.com/davatar_29158cc5080c5b710cf443261637dec0","Chelan-Douglas Health District  \n200 Valley Mall Parkway, East Wenatchee, WA 98802  \nOnsite Sewer System Installation Guide  \nUnderstanding Rules and Regulations  \n• Knowledge of WAC 246-272A, Onsite Sewage Systems  \n• Knowledge of Onsite Wastewater Treatment Systems Manual, USEPA  \nUnderstanding Design Plans  \n• Elements of site plan: design location and dimensions; topography and site features  \n• Standards and specifications; pump performance and hydraulics; treatment anddisposal technologies  \n• Basic knowledge of soil profile descriptions  \n• Ability to make mathematical calculations of area, volume, rates and measures  \nSite Preparation  \n• Apply designer’s plan to site; and identify conflicts that may relate toelevations or topography  \n• Equipment needs and limitations; materials and supplies; soil characteristics  \nInstallation Procedures  \n• Ability to recognize soil characteristics in the field  \n• Knowledge of specifications and installation techniques for tanks, baffles, filters and screens, piping and fittings, sand media, proprietary treatment components, pumps and siphons, liner materials, and valves  \n• Knowledge of electrical requirements  \n• Knowledge of gravity dispersal: step downs; D-Box; level manifold, level trench bottoms  \n• Knowledge of sand filter and pump/siphon dosed system requirements  \n• Knowledge of timers  \n• Knowledge of bedding, testing, and pipe connection methodologies  \n• Knowledge of pump performance specifications: total dynamic head in pressurized systems  \n• Ability to make mathematical calculations and conversions  \nStudy Guide  \nThis study guide is intended to help homeowners prepare for the Installer Exam by pointing to the sections of the regulations and State and Federal guidance documents most relevant to installers. It is not a substitute for those documents.  \nSome of the following materials are referenced in cases where an issue is not addressed in the Washington Administrative Code (WAC 246-272A), and are the standards of practice for items not specified in regulation.  \nStudy Materials Available on the Internet:  \n• The Washington Administrative Code WAC 246-272A . Please pay special attention to sections 0250, 0260 and 0265  \n• Recommended Standards and Guidance (RS&G) documents addressing specific systems such as Pressure Distribution Recommended Standards and Guidance (RS&G)  Documents  \n• The EPA Design Manual (EPA) publication \\#625/R-00/008 (published 2002) Onsite Wastewater Treatment Systems Manual  \n•  CDHD Onsite Construction Manual  \nStudy Materials Included in this Handout:  \n• Department of Ecology (DOE)“Criteria for Sewage Works Design”(Section C1-9)  \n• EPA excerpt on septic tanks (Page 4-43 & 4-44)  \n• Uniform Plumbing Code (UPC)“Building Sewers”(Section 1106)  \n• Installation Report  \n• Final Inspection for OSS (Checklist)  \nThe Washington On-Site Sewage Association has classes available. The Association can be contacted @253-770-6594 or [https://wossa.org/](https://wossa.org/)  \nGeneral Notes  \n1. Installers are required to be licensed by this Health District before they can install in Chelan or Douglas County (CDHD Code 4 .20.060.A) .  \n2. Installers are required to be licensed by this Health District before they can install in Chelan or Douglas County (CDHD Code 4 .20.060.A) .  \n3. The installer must follow the approved design to the scale specified in the design.  \n4. An appointment for inspection must be made with the inspector at least 2 workingdays prior to the desired date of the inspection. Please email: [inspections@cdhd.wa.gov](inspections@cdhd.wa.gov)  \n[5](5). The Installation Report and Record Drawing must be completed and on site at thefinal inspection.  \n6. All or any portions of the sewage disposal system must be inspected and approved before it is covered with soil (0250) .  \n7. The installer should shoot elevation grades and stake drain field location priorto excavating.  \n8. Roof and surface water runoff or discharge must be directed awa","cbCaijdImIHljvwy","https://ap.wps.com/l/cbCaijdImIHljvwy","pdf",454543,"English","# Understanding Rules and Regulations\n# Understanding Design Plans\n# Site Preparation\n# Installation Procedures\n# Study Guide\n## Study Materials Available on the Internet\n## Study Materials Included in this Handout\n# General Notes\n# Building Sewer\n# Septic Tank","[{\"question\":\"What regulations and guidance should installers study for the OSS Installer Exam?\",\"answer\":\"Installers are directed to WAC 246-272A, relevant recommended standards and guidance documents, and the USEPA Onsite Wastewater Treatment Systems Manual, along with local and referenced handout materials like DOE criteria and UPC excerpts.\"},{\"question\":\"What design-plan skills are emphasized in this guide?\",\"answer\":\"The guide emphasizes understanding site plan elements (location, dimensions, topography), standards and specifications, pump performance and hydraulics, soil profile descriptions, and the ability to perform area/volume/rate calculations and conversions.\"},{\"question\":\"What are the key installation and inspection requirements mentioned?\",\"answer\":\"Installers must follow the approved design to scale, schedule inspections at least two working days in advance, complete the Installation Report and Record Drawing on site for final inspection, and ensure required system components are inspected and approved before being covered.\"}]","Onsite Sewer System Installation Guide - Study Guide | PDF",1792793680]