PRIMARY TANK
SFR 20 20 20 SFR SFR 20 20 25 25 25 25 25 SFR SFR 20 SFR 20 SFR SFR 20 25 SFR SFR SFR 20 25 SFR SFR SFR 20 20 20 SFR CC 20 20 20 20 20 20 25 25 25 20 25 25 25 20 25 25 25 25 25 25 20 25 25 25 25 25 25 25 20 20 20 20 20 20 20 25 25 25 25 25 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 4243 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 25 25 25 1,500 GAL. PRIMARY TANK 1,500 GAL. PRIMARY TANK 1,500 GAL. PRIMARY TANK 1,500 GAL. PRIMARY TANK 1,500 GAL. PRIMARY TANK 1,500 GAL. PRIMARY TANK 4" SCH 40 GRAVITY SEWER LINE 4" SCH 40 GRAVITY SEWER LINE 4" SCH 40 GRAVITY SEWER LINE 4" SCH 40 GRAVITY SEWER LINE AX-MAX225-35 SECONDARY TREATMENT UNIT (35' LONG X 7.5' WIDE X 7.5' TALL; BURIED TO 50% HEIGHT) FUTURE FOOTPRINT: AX-MAX225-35 SECONDARY TREATMENT UNIT (35' LONG X 7.5' WIDE X 7.5' TALL; BURIED TO 50% HEIGHT) (FOR ADDED CAPACITY AS NEEDED - FUTURE DEV. …
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SFR 20 20 20 SFR SFR 20 20 25 25 25 25 25 SFR SFR 20 SFR 20 SFR SFR 20 25 SFR SFR SFR 20 25 SFR SFR SFR 20 20 20 SFR CC 20 20 20 20 20 20 25 25 25 20 25 25 25 20 25 25 25 25 25 25 20 25 25 25 25 25 25 25 20 20 20 20 20 20 20 25 25 25 25 25 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 4243 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 25 25 25 1,500 GAL. PRIMARY TANK 1,500 GAL. PRIMARY TANK 1,500 GAL. PRIMARY TANK 1,500 GAL. PRIMARY TANK 1,500 GAL. PRIMARY TANK 1,500 GAL. PRIMARY TANK 4" SCH 40 GRAVITY SEWER LINE 4" SCH 40 GRAVITY SEWER LINE 4" SCH 40 GRAVITY SEWER LINE 4" SCH 40 GRAVITY SEWER LINE AX-MAX225-35 SECONDARY TREATMENT UNIT (35' LONG X 7.5' WIDE X 7.5' TALL; BURIED TO 50% HEIGHT) FUTURE FOOTPRINT: AX-MAX225-35 SECONDARY TREATMENT UNIT (35' LONG X 7.5' WIDE X 7.5' TALL; BURIED TO 50% HEIGHT) (FOR ADDED CAPACITY AS NEEDED - FUTURE DEV. PHASES) INTERMITTENTLY DOSED SAND POLISHING FILTER (FOR PRODUCING RECYCLE QUALITY WATER) FUTURE FOOTPRINT - INTERMITTENTLY DOSED SAND POLISHING FILTER (FOR PRODUCING RECYCLE QUALITY WATER (AS NEEDED FOR FUTURE DEV. PHASES) 48" DIAM SUBSURFACE DISPERSAL FIELD DOSING DUPLEX PUMP BASIN SUBSURFACE SOIL EFFLUENT DISPERSAL FIELD; 18 LATERAL LINES @ 88' LONG; SIX DOSING ZONES. 30" DIAM. EFFLUENT DOSING BASIN TWO 3-PORT DISTRIBUTING VALUES (NON-ELECTDRIC, HYDROMECHANICALLY ACTUATED) VALVING ON DOSING LINES WITHIN EACH ZONE AS NEEDED FOR PRESSURE ADJUSTMENT / EQUALIZATION 4" SCH 40 PVC GRAVITY SEWER LINE 2" SCH. 40 PVC GRAVITY EFFLUENT PIPE (TYPICAL EACH LOT) 10' UTILITY SERVICE ROAD TO RECYCLE STORAGE CISTERN(S) OR UPHILL SUBSURFACE DISPERSAL AREA TO SUBSURFACE SOIL DISPERSAL FUTURE PRIMARY TREATMENT SERVICE CONNECTIONS TO 2ND AXMAX TREATMENT UNIT AX-MA225-35 SECONDARY TREATMENT UNIT (35' LONG X 7.5' WIDE X 7.5' TALL; BURIED TO 50% HEIGHT) INTERMITTENTLY DOSED SAND POLISHING FILTER (FOR PRODUCING RECYCLE QUALITY WATER) (15' x 40') 1,500 GAL. PRIMARY TANK 10' UTILITY EASEMENT 4" SCH. 40 PVC GRAVITY EFFLUENT MAIN COLLECTION LINE FUTURE SUBSURFACE SOIL EFFLUENT DISPERSAL FIELD AREA; SIZING AND FINAL LAYOUT BASED ON MONITORED FLOWS FROM PREVIOUS PHASES OF DEVELOPMENT LEGEND SCALE: 1" = 80' 1 Feet 160 80 0 SEPTIC DRAINAGE AREAS PROPERTY LINE ROADWAY CENTERLINE EDGE OF 28' ROAD ROW SURROUNDING PARCEL BOUNDARIES PARK / GREEN SPACE BUILDING PAD RETAINING WALL ST. THOMAS U.S. VIRGIN ISLANDS ST THOMAS TOWNHOME DEVELOPMENT WW-1 PROPOSED WASTEWATER SYSTEM SITE LAYOUT Susan M. Parten, P.E. Ph: (512) 923-5033 Email: sueparten@aol.com 1324 Alta Vista Avenue Austin, TX 78704 NOTE: All non-wastewater system proposed improvements, and survey, are by others. WASTEWATER TREATMENT SYSTEM OPERATIONAL OVERVIEW The proposed non-discharge / subsurface effluent dispersal wastewater treatment system consists of the following elements: 1) Primary treatemnt via 1,500 gallon two-compartment septic tanks at each residential building; 2) Small diameter gravity effluent sewer lines draining to common locations for subsequent treatment. In the most downhill area of the tract a small lift station will be used to deliver primary treated effluent to the secondary treatment unit; 3) Secondary treatment by a fixed-film / packed media treatment process in contained / enclosed treatment housings. These treatment units are manufactured by Orenco Systems, Inc. in Sutherlin, Oregon, and have been used very successfully, including multiple projects of varying sizes in the U.S. Virgin Islands. Those projects include a system serving the Mountaintop Condos on St. Thomas. 4) For effluent to be recycled / reused for toilet flushing or outdoor surface watering / wash-down needs, sand polishing will be provided through the intermittent / timed dosing of sand filters. Effluent will be disinfected via UV irradiation prior to reuse, with a low residual chloride concentration for effluent being used for toilet flushing. 5) Effluent not used for recycle / reuse will be low-pressure dosed to subsurface dispersal field areas.