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HomeMy WebLinkAboutpitkin.eh.264916101003 (1999)Aspen/Pitkin Environmental Health Department Permit for an Individual Sewage Disposal System 130 S. Galena St. Aspen, Colorado 81611 Phone 970-920-5070 / FAX 970-920-5197 Permit # 99030 Parcel ID # 2649-161-01-003 Type of permit New( ) Repair due to failure ( X) Addition to House( ) Name of Owner Tom & Sydney McBrayer Street Address 0074 Crystal Circle, Carbondale Property legal description Lot 20 Blk 2 Fil 7804, Crystal River Country Estates Size of lot 1.04 Total square footage of the house 1,458 Water source Crystal River Country Estates Water Co. # of bedrooms in house 3 # of offices, lofts & similar sized rooms in house (2 - future expansion) Caretaker unit # of bedrooms in caretaker unit Designed for what # rooms (list) Total square footage of the caretaker unit 0 0 # of offices, lofts & similar sized rooms in caretaker unit FIVE 3 current bedrooms and 2 in a future expansion Permit information Designed by Zancanella and Associates, Inc. Mailing Address PO Box 1908 - 1005 Cooper Avenue, Glenwood Springs, CO 81602 Perc rate 40 mpi Profile hole depth 8' Depth to groundwater or bedrock Septic tank capacity 2,500 gallon Absorption area 2,212 sq ft Comments +8' Septic permit approved per compliance with the engineer design and specifications dated May 25, 1999. Design is for a two compartment concrete septic tank, optional dosing chamber, and a absorption bed with 100 Infiltrator units. All setbacks must be maintained. A 10 ft separation of water and sewer lines is required unless the lines are encased according to the regulations. The failed septic tank and drywell must be properly abandoned. Permit approved by: Date: Plans and specifications of the p osed individual s wage disposal system have been reviewed and are considered satisfactory. Permission is hereby granted to the owner or the agent to perform the work indicated in accordance with the Pitkin County ISDS Regulation in effect at the time of issue. This permit becomes invalid 6 months from the date that the permit was issued unless system construction has commenced or an extension has been approved in writing by the Department. As -built drawings must be included with this permit before the final approval will be issued.. Installer: Final inspection approval A - Date: i l� /oW 9 /b 0 '911.1 r /©/L i x i d MAY -10-99 MON 08:02 AM AcPEI/PITKIN ENV HEALTH FAR:970 920 50?� ASPEN/V= KIN ENVIRONMENTAL. HEALTH DEPA, ,+RENT APPLICATION FOR INDIVIDUAL. SEWAGE DISPOSAL SYSTEM 130 S. Galena St., Aspen Colorado 81611 Phone 970-920-5070/l=ax 970-9420-5039 PAGE 3 Name of OWNER 9, S P Owner's Mailing Address C2� � l,ei � CA'e-a /"� �v YJO z % Business Phone: 20 -- y V ` 90 ( Horne Phone: 9 )d -- 9 �-5 ":"�2_Co6 T Primary Contact Person (all communication regarding this permit will go through this person) Name Company " e 2 Contact Mailing Address Business Phone: 9qC- 90r1 Cell phone : Fax : V - 4?f'/-3 Parcel iD # (available from assessor's office / at 920.5160 or at www.aspen.contlassessor4 2— Street address of property dQ�� �R*1�7 CIKC. Ch�'eG9�::Gre �`e CCS, �-/6Z3 C'�ys � r�/wt C��,,•� r� Legal Description: tot _2LL ,Block 2. Filing IVOL( SubdivisionCS- Size of lot: acres. Type of proposed structure: Size of bldg, envelope: Total square feet of houseJ�`3 # of bedrooms in house # of offices, lofts & similar sized rooms in house J - Caretaker Unit: Attached ( ) Detached ( ) Total areafsq. ft.) of caretaker unit # of bedrooms in caretaker crit # of offices, lofts and similar size rooms of caretaker unit Permit is for: New Home ( } Repair due to failure (x) Remodel/Addition ( } Emergency use • `Nater; Private well ( ) Spring ( ) stream { } Community/Public Water System O If community system: Name of system C ey5fj Rit),4'k, (00'QtLr)=i � � w� c11 - The fee for a tSDS application ,s $330 for a permit that takes 6 hours or less for the department to approve, tf approval canes longer than 6 hours, a rate of $55 per hour will be charged. The maximum fee is $t DOD. The basic fee cf $330 is due at the time of application. The remainder, if any, will be due in two stages: first, at the time of issuance of the ISDS permit; second, before final approval of the ISCS permit_ Application for an individual sewage disposal system is hereby submitted. I hereby certify that the above information is true and accurate and that I have provided true and accurate information on locations of all existing and proposed wells, contour intervals, buildings, property lines, ditches, slopes, waterlines, springs, suction or irrigation lines, drinking water cisterns, drain tiles, irrigation ditches, lakes, water ceurses, streams, floodplain, dry gulches, and existing septic systems. I hereby celify that any such features not shown on attached site map are not present. Issuance of the permit does not imply the approval of any other permit required for construction pursuant to Pitkin County codes, No construction may be undertaken until all approvals and permits have been obtained. The Aspen/Pitkin Envirormental Health Department, Pitkin County and employees of these agencies Nill be held harmless shouid the individual sewage disposal system fail or malfunction. The permit to construct is issued on informaticn submitted ay the applicant or hislher representatives. The owner assumes fufl responsibility in case of failure of the system. Signature of applicant ryt' > Date `J A Received by M, Receipt # Date P.O. Box 1908 N*1 (970) 945-5700 t4 oo5 Cooper Ave. (970) 945-1253 Fax Glenwood Springs, Z411MC411NELL4 4mo 455OCWTES, INC. CO 81602 ENGINEERING COMSULUMTS September 8, 1999 Aspen - Pitkin Environmental Health Department Attn: Nancy McKenzie 130 South Galena Street Aspen, CO 81611-1975 Re: McBrayer Septic System Dear Nancy: Enclosed please find the as -built drawings for the McBrayer residence in Pitkin County. We have determined that the system was constructed as shown with the exception of the valve boxes to be located above the monitoring tubes. We understand that the owner plans to trim the monitoring tubes and install the valve boxes at the final grade after allowing time for the soil to settle. We have been informed that the work is to be completed this coming Fall. If you have any questions please call our office at (970) 945-5700. Very truly yours, Zancanella & Associates, Inc. -- L "'A Z"��V_q Thomas A. Zancanella, P.E. President cc: Tom McBrayer N:U9000's199614\asbui1t.wpd +* A .open / Pitkin Environmental Health Departmc., it Contact Log Sheet el ID#: Address: �] / 2 Date Person Spoken To Comments / Action to be Taken Initials Time 7 3 y A IV L/ % l A z� y «- �.7- G� r Z r fall In - I` r May 25, 1999 TO: Aspen/Pitkin Environmental Health Department FROM: Crystal River Country Estates Water Company State lD # 141988 RE: Application for Individual Sewage Disposal System Lot 20 Block 2 Crystal River Country Estates 0074 Crystal Circle Good Day This letter is written as proof of adequate water supply for the attached application. The Crystal River Country Estates Water Company is a mutual pipeline company, which provides infrastructure for the homeowners who each have a decreed water right through the corporation. Attached are the company articles of incorporation, company bylaws, and consent of directors, which specify the water rights and a 42.835 GPM water flow per lot. Also attached are three recent water bacteriology reports. As a regulated systems we have conducted all required state tests. If you have questions please contact me. Sincerely, Tom Mc Brayer CRCEWC President 963-2667 LABORATORY & RADIATION SERVICES US MAII WATE 41900 003 '-s 8100 LOWRY BOULEVARD PO BO !3 DENVER. CO 80220-6928 DENV6-, ,J 80217 BACTERID '�— —/'� W, C Y' .AMPLE INFORMATION: '9I CCCMsMUNITY ❑ NON -COMMUNITY ❑ PRIVATE DATE TIME BY C'J i2�ROUTINE ❑ RAW ❑ REPEAT FOR THE MONTH OF`//�( ❑ AM NS ID � l/�J; Q COLLECTED / / ❑SPECIAL PURPOSE ❑FINISHED ❑ AM t., kr%SWC! IVB �V'�+,4iYLSI/ MG/L RECEIVED _1_1— ❑ PM a, EM OF SYSTEM CHLORINE RESIDUAL DDRESS CITY COUNTY ORDERED BY: (SAMPLE MAY NOT BE TESTED IF ALW FORMAI­10�q IS NOT PROVIDED) FEE STAMP �^ PHONE NAME LZ C ADDRESS ' C9C,-J�jil C , ( CITY / STATE / ZIP I LAB 106 (07/97) TEST ORDERED kTD BACT. ❑ OTHER- RESULTS: SEE REVERSE FOR EXPLANATION TOTAL COLIFORM ❑ PRESENTABSENT MOST PROBABLE NO. COUFORM/100ML ElDENVER ❑ AN O GRD. JCT. N ANALYST LABORATORY & RADIATION SERVICES US MAIL WATERO + L' h +� ' 8100 LOWRY BOULEVARD PO BOX 17123 it `t DENVER, CO 80220-6928 DENVER, CO 60217 BACTERIOLOA Tondo i� of P,611cftdm ad FarimvmmiEA AMPLE INFORMATION: {&COMMUNITY ❑ NON -COMMUNITY LJ PRIVATE DATE TIME BY t[J ROUTINE El RAW El REPEAT FOR THE MONTH OF ❑ AM COLLECTED /1.0 -, G� PM J -• WS ID Gl ❑SPECIAL PURPOSE ❑ FINISHED ❑ AM _ MG/L RECEIVED ❑ PM f SY M / �r - CHLORINE RES UAL } �j Cgv �. ,CL-�Y /� t %L't~" RESULTS: SEE REVERSE FOR EXPLA ATION DDRESS CITY COUNTY TOTAL COLIFORM PRESENT Al IRDERED BY: (SAMPLE MAY NOT BE TESTED IF ALL INFORMATION IS NOT PROVIDED) MOST PROBABLE N0. FEE STAMP PHONE COLIFORW100ML NAME ,Z %< < 5 A Cr�� ADDRESS� )dGRD- CITY / STATE / ZI\`P ��ElDENVER ❑ U N O JCT. LAB 106 (07/97) TEST ORDERED }�J STD BACT. ElOTHER ANALYST LABORATORY & RADIATION SERVICES US MAIL WAT�p 17123 DENY R, GO 80220-6928D 0 20- 9280 DEENVOER, CO 80217 BACTERIOL`L' IJ 59 0 0 2 6 6 A %MPLE INFORMATION: `I& CyyO-MMUNITY ❑ NON -COMMUNITY ❑ PRIVATE DATE TIME AM B( 7 'S ID ` L/ (i7 / 7� }�-� ROUTINE ❑ RAW ❑ REPEAT FOR THE MONTH OF f Ll / U ❑ COLLECTED PM PURPOSE ❑ FINISHED ❑ AM / S n^ � �CSLaA �✓W % 14� tis CAA - '-S MG/L RECEIVED ----Z---L— ❑ PM T . -, I' � � �µC H,L9RINE RESPA 4 4 ` RESULTS: SEE REVERSE FOR EXP NATION 0�'ESS Y f/(,fiC� CITY COUNTY El PRESENT /ABSENT iDERED BY: (SAMPLE MAY NOT BE TESTED 1F/AGS/L�.INFORMATION IS NOT PROVID TOTAL COLIFORM FEE STAMP `— ` 1�) MOST PROBABLE NO. PHONE COLIFORM/100ML 2 C, C( 2 3a�(v�l�?3 i ' ❑ DENVER ❑ DUAANG6 I GRD. JCT. r+R — t 1A � M ASPEN/PITKIN ENVIRONMENTAL HEALTH DEPARTMENT ISDS DESIGN REQUIREMENTS -DEPARTMENT USE ONLY Name McBrayer House Size >2000 <6000 (75 gpd, 100 gpd, or 130 gpd) 100 #of Bedrooms, Similar Rooms accessible to baths in Main Residence 5 # of Bedrooms, similar rooms w/ access to bath in ATTACHED caretaker # of Bedrooms & Similar Rooms w/ access to baths in DETTACHED caretaker Average Daily Waste Flow 750 # bedrooms X 2 people/br X 75 State Review Required? no Perc Rate 40 (T) 3 equals # of Perc Holes Required Design Flo w (Q) = # bedrooms X 2 people/bedroom X gpd X 1.75 Q= 1750 Minimum tank capacity 2188 gallons Absorption Area (A= Q/5 X SQRT) A = 2214 sq. ft. of absorption area required 143 infiltrator units without reduction A maximum 30% reduction is allowed for use of deep gravel or gravelless chambered system. 1550 sq.ft. with reduction 100 infiltrator units with reduction AREA NEEDED FOR STANDARD ABSORPTION TRENCHES 738 2214 Total sq ft /3 =lineal ft of trench needed 13 738 lineal ft/assumed trench length of 60ft = # of 60ft trenches needed 12 # trenches minus 1 = rows of 6ft wide undisturbed soil between trenches 39 13 times 3 = total width of of 60" long field needed for just the trenches 72 12 times 6' = total width of 60' long field needed just for undisturbed soil 111 width of trench +width of undisturbed soil = total width needed 111 by 60 ft is the area needed for a standard absorption field in a trench configuration with no reductions taken and ASSUMING AN AVERAGE PERCOLATION RATE OF 40 SLOWER PERCOLATING SOILS WOULD REQUIRE MORE AREA. SETBACK FROM WELL SETBACK FROM POND, STREAM OR IRRIGATION DITCH # of feet = 160 # of feet = 110 SETBACK FROM DRY GULCH # of feet = 85 Remember: 8 feet of additional distance for each 100 gallons/day of design flow over 1,000 gallons/day should be added unless an RPE can verify that it is not necessary to prevent contamination. 1/20/99 Printed on Recycled Paper r SHEET N0. SITE PLAN—FLOOR PLAN McBrayer Residence SCALE: TDATE: SHEET // ZANCANELLA AND ASSOC/ATES, /NC. 1^ = 25' May 25, 1999 1 OF 1 MADE CHKD APPD DRAWN BY: CHKD BY: APPD BY: PLAN N0. ENGINEERING CONSUL TANTS REV DATE REVISION POST OMCE BOX 1908 - 1005 COOPER AVENUE PROJECT: 99614 N0. BY BY BY MH TAZ TAZ 99614�SEPT�C GLENWOOD SPRINGS, COLORADO 81602 (970) 945-5700 Non—Existing on Property Wells within setback distances Slopes <15% Springs Suction Lines Cisterns Drain Tiles Irrigation Ditches Lakes Ponds Water Courses Streams Floodplains Floodways Dry Gulches Irrigation Bedroom Bedroom Both \\\Bedroom \� Dosing Tank Dining Living Rm WIRV FamilyRoom • �G-1EntryGarage / Garage IF Profile Hole ,f Propose'} Water Li UR �o R c� o Ditch V-0 W wl c uws / / / 55�to Previous Dry Well N 1 I I I I I 1 i 1 1 7 9 I I I •AK Off, 0 I .a 4 I SCALE 1" = 20' 4" PVC RISER W/ PLASTIC VALVE BOX COVER. TO BE PLACED ® APPROX CENTER OF TRENCH BOTTOM 8" OF PVC TO BE PERFORATED (TYP.) CUT 4" DIA. HOLE IN 'INFILTRATOR' UNIT AND SEAL AROUND PIPE TO INSURE NO SOIL CAN LEAK INTO 'INFILTRATOR'. BACKFILL WITH EXCAVATED MATERIAL TO 24" (SEE INFILTRATOR INSTALLATION INSTRUCTIONS) 3: i NOTE: THE SEPTIC TANK SHOULD BE PUMPED ANNUALLY TO PREVENT THE BUILDUP OF FLOATING SOLIDS AND SLUDGE. FAILURE TO DO SO WILL RESULT IN SOLIDS ENTERING THE LEACH FIELD CAUSING THE LEACH FIELD TO FAIL. /-- INFILTRATOR LEACHING CHAMBERS OR EQUAL. —LEACH BED SHALL BE ONE BED OF 100 UNITS. SCARIFY EXCAVATED LEACHING SURFACE (KEEP HEAVY EQUIPMENT OUT OF EXCAVATED AREA) ENTIRE LEACHING SURFACE TO BE LEVEL WITHIN + 0.05 FEET. 2' COVER MIN SIDE CROSS-SECTION VIEW SCALE: 1" = 2' r,.,.. D,orD ur/ Di Acnn WAi yr onV rMIrA 4" PVC RISER W/ PLASTIC VALVE BOX COVER. TO BE PLACED ® APPROX CENTER OF TRENCH BOTTOM 8" OF PVC TO BE PERFORATED (TYP.) CUT 4" DIA. HOLE IN 'INFILTRATOR' UNIT AND SEAL AROUND PIPE TO INSURE NO SOIL CAN LEAK INTO 'INFILTRATOR'. EXISTING SEWER S' SCARIFY EXCAVATED LEACHING SURFACE (KEEP HEAVY EQUIPMENT OUT OF EXCAVATED AREA) INFILTRATOR LEACHING CHAMBERS OR EQUAL. ENTIRE LEACHING SURFACE TO BE LEVEL WITHIN + 0.05 FEET. LEACHING BED SHALL BE 10 ROWS — 10 UNITS LONG FRONT CROSS-SECTION VIEW SCALE: 1" = 2' 24' CONCRETE COVERS \T\\\ /\\//\\\//\\\\/\ IDARD 20' METER PIT SECTIONS (AS NEEDED) Ir 3' 4- PVC SEWER PIPE (ASTM 3034) MINIMUM SLOPE = 2% —► 4" X e PVC TEE / 4' X 4' PVC TEE 48' ONE PIECE SECTION PUMPING CHAMBER CONCRETE PEDESTAL 28' CONCRETE COVER I1111�'�' 4' X 4' PVC TEE H b Ir 3' 4- PVC SEWER PIPE (ASTM 3034) MINIMUM SLOPE = 2% —► 4" X e PVC TEE / 4' X 4' PVC TEE 48' ONE PIECE SECTION PUMPING CHAMBER CONCRETE PEDESTAL 28' CONCRETE COVER CROSS SECTION OF DOSING CHAMBER SCALE: 1 INCH = 2 FEET STANDARD 24' METER PIT SECTIONS TWO SETS OF AUTOMATIC SIPHONS FLOWING TO TWO SEPARATE FIELDS OVERFLOW PIPE FLUID DYNAMICS AUTOMATIC SIPHON MODEL NUMBER 417 OR EQUAL 4" PVC SEWER PIPE (ASTM 3034) MINIMUM SLOPE - 4% --; DISTRIBUTION MANIFOLD W/ CLEANOUT 4" PVC SEWER PIPES MINIMUM SLOPE = 47 NATURAL GROUND NOTE: 3:1 SLOPE IT IS THE RECOMMENDATION OF THE ENGINEER THAT A DOSING SYSTEM BE USED FOR THE SEPTIC SYSTEM. IT HAS BEEN SHOWN THAT A DOSING SYSTEM HAS A LONGER LIFE SPAN THAN CONVENTIONAL GRAVITY OPERATED TRICKLE SYSTEMS. GRAVITY SYSTEMS HAVE BEEN SHOWN TO CONCENTRATE EFFLUENT AT ONE SPECIFIC AREA OF THE LEACH FIELD, THEREFORE CAUSING FAILURE OF THE ABSORPTION RATE AT THE SPECIFIC AREA. THIS TYPE OF SOIL FAILURE IS PERMANENT. THE EFFLUENT IS THEN CONCENTRATED ONTO THE SURROUNDING AREA EVENTUALLY CAUSING TOTAL FAILURE OF THE SEPTIC SYSTEM. USING A DOSING SYSTEM, A MORE UNIFORM DISTRIBUTION OF THE EFFLUENT IS ASSURED. THE DOSING SYSTEM INUNDATES THE LEACHING AREA AND THEN ALLOWS THE SOIL TO REST AFTER THE LIQUID LEVEL OF THE DOSING TANK HAS BEEN SYPHONED TO THE A LEVEL BELOW THE SIPHON INTAKE. THE DOSING TANK ALSO PROVIDES A METHOD FOR AUTOMATICALLY ALTERNATING BETWEEN FIELDS. CALCULATIONS FOR ABSORPTION BED SIZE Current residence is 3 bedroom with possible future expansion to 5 bedrooms. The maximum size of the residence is expected to be between 2000 - 6000 square feet. therefore: Design Flow = 5 bedrooms X 2 persons/bedroom X 100 gpd/person X 1.75 peaking factor =5 X 2X 100X 1.75 = 1750 gallons per day Tank Volume = Design Flow X 1.25 (30 hour retention) = 1750 X 1.25 = 2188 gallons A 2500 gallon tank will be used. The absorption area for a gravel less / chambered system type of absorption bed is calculated using the following formula: Absorption Area = Q X SQRT (t) 5 Where Q is max daily flow rate = 1750 gallons per day, and where t is the verified percolation rate = 40 minutes per inch therefore: Absorption Area = 1750 X SORT (40) 5 =1750X6.32 5 = 2212 square feet When the Infiltrator gravel less chamber system is installed in a bed configuration, a reduction of up to 30% in the size of the absorption area may be allowed. For this location a 30% reduction is proposed. therefore: Absorption Area = 0.70 x 2212 sq. ft. = 1548 square feet of Absorption Area The footprint of one Infiltrator unit = 18.75 square feet, however, the effective area of one infiltrator unit = 15.5 sq. ft. and this value is being used conservatively. therefore: Infiltrator units = 1548 sq. ft. / 15.5 sq. ft. = 100 Infiltrator Units The Infiltrator units will be arranged in 10 rows, each containing 10 units. The total size of the absorption bed area will be 30' by 62.5' or 1875 sq.ft. The Infiltrator units will be covered by a minimum of 24" of earth over the entire absorption bed. Minimum horizontal distances between septic system components: absorption bed to any ditch or water course : 50 ft absorption bed to any potable water supply or supply line: 25 ft absorption bed to any property lines: loft absorption bed to any septic tank: 6 ft absorption bed to any residence: 20 ft absorption bed to any spring or well: 160 ft (100 ft + 8 ft for each 100 gallons over 1000) (750 / 100 = 7.5 therefore 100 ft + (8 ft X 7.5) = 160 em=====------------------ ===--------- = ===e= --- PERCOLATION TESTS WERE CONDUCTED BY ZANCANELLA AND ASSOC., INC. THE RESULTS ARE AS FOLLOWS: TEST PIT NUMBER PFRCOI ATION RATE (MIN. /INCH) TEST PIT #1 40 MINUTES/INCH TEST PIT y2 35 MINUTES/INCH TEST PIT y3 40 MINUTES/INCH TO BE CONSERVATIVE, 40 MIN/INCH WAS USED TO SIZE THE ABSORPTION BED e I1111�'�' CROSS SECTION OF DOSING CHAMBER SCALE: 1 INCH = 2 FEET STANDARD 24' METER PIT SECTIONS TWO SETS OF AUTOMATIC SIPHONS FLOWING TO TWO SEPARATE FIELDS OVERFLOW PIPE FLUID DYNAMICS AUTOMATIC SIPHON MODEL NUMBER 417 OR EQUAL 4" PVC SEWER PIPE (ASTM 3034) MINIMUM SLOPE - 4% --; DISTRIBUTION MANIFOLD W/ CLEANOUT 4" PVC SEWER PIPES MINIMUM SLOPE = 47 NATURAL GROUND NOTE: 3:1 SLOPE IT IS THE RECOMMENDATION OF THE ENGINEER THAT A DOSING SYSTEM BE USED FOR THE SEPTIC SYSTEM. IT HAS BEEN SHOWN THAT A DOSING SYSTEM HAS A LONGER LIFE SPAN THAN CONVENTIONAL GRAVITY OPERATED TRICKLE SYSTEMS. GRAVITY SYSTEMS HAVE BEEN SHOWN TO CONCENTRATE EFFLUENT AT ONE SPECIFIC AREA OF THE LEACH FIELD, THEREFORE CAUSING FAILURE OF THE ABSORPTION RATE AT THE SPECIFIC AREA. THIS TYPE OF SOIL FAILURE IS PERMANENT. THE EFFLUENT IS THEN CONCENTRATED ONTO THE SURROUNDING AREA EVENTUALLY CAUSING TOTAL FAILURE OF THE SEPTIC SYSTEM. USING A DOSING SYSTEM, A MORE UNIFORM DISTRIBUTION OF THE EFFLUENT IS ASSURED. THE DOSING SYSTEM INUNDATES THE LEACHING AREA AND THEN ALLOWS THE SOIL TO REST AFTER THE LIQUID LEVEL OF THE DOSING TANK HAS BEEN SYPHONED TO THE A LEVEL BELOW THE SIPHON INTAKE. THE DOSING TANK ALSO PROVIDES A METHOD FOR AUTOMATICALLY ALTERNATING BETWEEN FIELDS. CALCULATIONS FOR ABSORPTION BED SIZE Current residence is 3 bedroom with possible future expansion to 5 bedrooms. The maximum size of the residence is expected to be between 2000 - 6000 square feet. therefore: Design Flow = 5 bedrooms X 2 persons/bedroom X 100 gpd/person X 1.75 peaking factor =5 X 2X 100X 1.75 = 1750 gallons per day Tank Volume = Design Flow X 1.25 (30 hour retention) = 1750 X 1.25 = 2188 gallons A 2500 gallon tank will be used. The absorption area for a gravel less / chambered system type of absorption bed is calculated using the following formula: Absorption Area = Q X SQRT (t) 5 Where Q is max daily flow rate = 1750 gallons per day, and where t is the verified percolation rate = 40 minutes per inch therefore: Absorption Area = 1750 X SORT (40) 5 =1750X6.32 5 = 2212 square feet When the Infiltrator gravel less chamber system is installed in a bed configuration, a reduction of up to 30% in the size of the absorption area may be allowed. For this location a 30% reduction is proposed. therefore: Absorption Area = 0.70 x 2212 sq. ft. = 1548 square feet of Absorption Area The footprint of one Infiltrator unit = 18.75 square feet, however, the effective area of one infiltrator unit = 15.5 sq. ft. and this value is being used conservatively. therefore: Infiltrator units = 1548 sq. ft. / 15.5 sq. ft. = 100 Infiltrator Units The Infiltrator units will be arranged in 10 rows, each containing 10 units. The total size of the absorption bed area will be 30' by 62.5' or 1875 sq.ft. The Infiltrator units will be covered by a minimum of 24" of earth over the entire absorption bed. Minimum horizontal distances between septic system components: absorption bed to any ditch or water course : 50 ft absorption bed to any potable water supply or supply line: 25 ft absorption bed to any property lines: loft absorption bed to any septic tank: 6 ft absorption bed to any residence: 20 ft absorption bed to any spring or well: 160 ft (100 ft + 8 ft for each 100 gallons over 1000) (750 / 100 = 7.5 therefore 100 ft + (8 ft X 7.5) = 160 em=====------------------ ===--------- = ===e= --- PERCOLATION TESTS WERE CONDUCTED BY ZANCANELLA AND ASSOC., INC. THE RESULTS ARE AS FOLLOWS: TEST PIT NUMBER PFRCOI ATION RATE (MIN. /INCH) TEST PIT #1 40 MINUTES/INCH TEST PIT y2 35 MINUTES/INCH TEST PIT y3 40 MINUTES/INCH TO BE CONSERVATIVE, 40 MIN/INCH WAS USED TO SIZE THE ABSORPTION BED e