DESIGN AND SPECIFICATION GUIDELINES

1 DESIGN AND SPECIFICATION GUIDELINESFOR low pressure sewer SYSTEMSPREPARED BYA TECHNICAL ADVISORY COMMITTEE FORTHE STATE OF FLORIDA DEPARTMENTOF ENVIRONMENTAL REGULATIONJune1981 DESIGN AND SPECIFICATION GUIDELINESFOR low pressure sewer SYSTEMSP repared by aTechnical Advisory CommitteeDan Glasgow, Editor and ChairmanWilliam C. BowneThomas H. BraunEdward T. KnudsenJames F. Kreissl*Paul A. Kuhn*Robert E. LangfordPatricia H. LodgeDavid A. MaurerJames E. SantaroneHarold E. SchmidtB. Jay SchrockDr. G. J. ThabarajRichard D. Vaughan*John G. HendricksonStaff assistance was provided by the General Development Corporation,Miami, Florida* Principal Contributing AuthorsFOREWORDIn April 1980, Mr.

2 Jake Varn, Secretary of the State of Florida Department of EnvironmentalRegulation authorized the formation of a Technical Advisory Committee to prepareDepartmental DESIGN and Specifications GUIDELINES for low pressure sewer Systems. Thisdocument was prepared with the sponsorship of the General Development Corporation withreview and staff assistance provided by Dr. G. J. Thabaraj and Mr. James E. Santarone of theState of Florida Department of Environmental Regulation. The contents of this document aresupplemental to and made a part of the Rules of the State of Florida Department ofEnvironmental Regulation, Chapter 17-6, Florida Administrative this document, references are made to recognized product and installationstandards.

3 Where a conflict may exist between the cited standard and this document, therequirements set forth in this document shall prevail unless otherwise authorized in writing fromthe Department of Environmental OF CONTENTST itlepage ..iForeword ..iiTable of Contents ..iiiList of Tables ..viiList of Figures ..viiiChapter I General Introduction ..I-12. Facility Planning System Layout and pressure sewer On-lot DESIGN Contingency Planning ..I-207. Mainline Treatment and Characteristics of Low PressureSewer System Management Basic DESIGN II ON-LOT FACILITIES Septic Tank and Septic Tank Structural Corrosion of Materials Used in SepticTank and Wetwell installation of Septic Septic Tank Construction.

4 II-51. Concrete Septic Tanks ..II-52. Plastic Septic Tanks ..II-53. Metal Septic Existing Septic Inlets and Outlets ..II-66. Septic Tank Risers and Wetwell Covers ..II-6C. Grinder Pumps ..II-62. Effluent Wetwell Internal discharge Check Hose Gate or ball Quick disconnect Level Sealing of adaptors passing through Grinder Pump Control Septic Tank Effluent Pump Control Systems ..II-133. Pump and Alarm Existing Septic Tank Overflows and Drainfield Grinder Holding Existing on-site septic STEP Existing New Building Service Lines ..II-151. Service Line Check On/Off Valves and Corporation Service Line Separation of Waterlines and Street Connection to pressure sewer Connection Wye and tee Wet tap Polyethylene service pipe installation III pressure sewer MAIN CONSTRUCTION.

5 III-IA. pressure sewer Main pipe Materials ..III-11. Thermoplastic sewer Main pipe Polyvinyl chloride (PVC) pressure Polyethylene (PE) pressure Acrylonitrile butadiene-styrene (ABS) pressure Thermoplastic pressure pipe pressure sewer pipe Fiberglass Reinforced ThermosettingResin (FTR) pressure ductile iron (DI) pressure pressure sewer pipe Location and Depth of Excavation and Trench Rock Excavation pressure sewer Main pipe Laying and Plugs, anchorage and thrust Flushing, Leakage, Testing and pressure Leakage Special Construction Roadway Railroad Bridge Potable water supply installation in vicinity of potable water supply Air release Connections and Appurtenance boxes and Valves and valve Terminal manhole pipe locating marking Record Drawings.

6 III-148. OF TABLEST able I-I Growth and Development I-2 Natural and Physical I-3 Typical Sources of Information on On-Site I-5 Table I-4 Preliminary Regulatory I-5 PVC pipe OF FIGURESF igure I-1 Typical pressure sewer I-2 pressure sewer I-3 Recommended DESIGN I-4 pipe Sizing II-1 Typical Pressurization Unit (PU) II-2 Typical Septic Tank Effluent Pump II-3 Typical Grinder Pump (GP) II-4 Typical Head-flow Characteristics for CentrifugalAnd Semi-positive Displacement III-1 Recommended Valve and Cleanout ArrangementsWith Provision for Hose III-2 Recommended Valve Box and Cleanout ArrangementsAlong Straight Runs and at Changes in III-3 Suggested Valve Box Cleanout Arrangements at JunctionOf pressure sewer III-4 Recommended Valve Box and Cleanout Arrangements atEnd of pressure sewer III-5 Terminal Manhole III-6 Methods of Providing Service Connections to PressureSewer IDESIGNS ection A.

7 GENERAL CONSIDERATIONSPart order to properly choose and DESIGN any wastewater collection facility it is necessary todefine the service area in geographical, topographical, geological, climatological, sociological,and economic terms. The complexity of required definition may vary with circumstances from arelative minimum with a planned development to a maximum for an existing , the difficulty of the DESIGN process varies in the same manner. The plannedcommunity usually can be characterized as a situation where optimum solutions are possible, thelines of communication simple and direct, and constraints and their sources fewer and moretechnologically based.

8 Existing communities generally present situations and solutions whichare often based on less technical aspects and increased public relations. The considerations ofthis document are based primarily on the technological problems of pressure sewer Planning InformationThe initial step in any planning effort is to define the service area. Information which ispotentially useful for facilities planning includes:a. service area growth and development;b. natural and physical features;c. existing wastewater and residuals disposal practices; andd. regulations and an existing community Table I-1 offers an example of growth and development factorsand potential information sources.

9 For a planned community, the DESIGN should be based on theprojected population growth and those socioeconomic factors which would provide some basisfor determining reasonable user charges for the wastewater collection and treatment systemI-2 TABLE I-1 GROWTH AND DEVELOPMENT CensusState Planning AgencyState Office ofEmployment SecurityRegional PlanningAgency/208 AgencyLocal PlanningAgencyLocalAdministratorLocalTax AssessorBusiness andInstitutionalSurveyLocal ChamberOf CommerceExisting Population00*Historical Population**Population Characteristics for LastTwo Federal Census Periods-Age, Cohorts,Median Family Income*Population Projections - Local and RegionalDuring Service DESIGN Period**Existing Employment For IndividualBusiness and Institutions0**Economic Base/Employment Projections*00 Existing Property Assessment Valuation*Property Tax Rate*Equalized Tax Rate*Annual Revenues by Major Source*Annual Expenditures by Major ServiceCategories**Indicates Preferred Data Source0 Indicates Alternative Data SourcesFactorSourceI-3during the planning period.

10 Anticipated growth patterns can affect pressure sewer designs inseveral I-2 presents a list of typical natural and physical features and potential informationsources. These features can affect the DESIGN and construction of pressure existing communities relatively complete information on existing wastewater andresiduals disposal systems must be obtained. Where sewers and central treatment facilities exist,the existing data sources are relatively easy to locate. Where on-site disposal has beenwidespread the data are generally more diffuse. Table 1-3 lists typical sources of information onon-site systems.