The URL can be used to link to this page

Home My WebLink AboutOWTS DesignCusümen Sanchez, Guadalupe PlotPlån- Ovsrvlew Addrcss:TBD Dr Rifel, CO HomeS¡zer26'x48' Subdlvision:creMesRânch tðtfr52 Lotsizs46ac Setùacks:F:25'R¡25'S¡10' CrãtedBy¡SD Dztpt6l22l2023 *'* Ail ûleasuremens geneÉted using Carñeld Countv GIS p.oDerwlinesPæl #r 2403-041-00-047 =@" o !(! q,tII Þ =- F "''g E Ë ı ôE 1+ =ı=;þ>L¡-- Sðl= O a - h E¡ Ë- ı ı ıE ü- 9¡"8¡"8¡' Ë F$3IassËËçili3-e$-e35 -ñci+d<tñcdotP=SP anoc =àLoo ^e_ a iiîñç3E=-.Ãooo(Ú.:gT.ZØW9 ooo o -6 Fó ñtc .oao ^anE0) F;gila$ EFË;Ng Eoo od ooo ooN obF .{ +Io)o)ôt + ñ*oo Cr) o @ +ñs(o q @ oo [J_o Plot plån ñ noÞ tlre followiDg; PþpeÍyli¡6 DÈb¡e hoæ b pÞpcrty liæs GaËge/Pole Be/Shop e A/C &Â/C Disnffi Build oÈr/shed @ß SerbeìGDimæbem¡ruæ Hoæfro¡Vl8d@. Diffi teûh fiÊld b pÞpertyÍË Eæffi/ROW Hom deliEry obñr¡d¡tÉ IbÈbleRMo FÆ-Fa@b Cc{r.wl Spæ4.6D¡iwEyWx L sRtæc6 WærliE/ClffiWe[ CùlÈß G6/PÞpae Ekic Sewliæ sêpdc/¡4b feld not consistÊnt with the plot pla[ Signature Sales Profesioml - Da'J -.......--Date Date Arrowhead Dr N ''@' s 3 9. House to Cistern 323'. 10. House to Well 333', 1 1. Leach to Cistern 343'. 12. Leach to Well 353' 13. Un-named Dry Ditch House to Property Lines North: 450' South: 2509' East: 243' West: 373' 11 1 2 3 4 5 6 7I . House . Leach Field . Cistern . Well .RV . Conex . Conex Leach Field to Property Lines North: 639' South: 2522' East: 180' West: 433' Driveway 16'x860' 0'1000' 315'625', I 875' 3007'+/- 12 2991'+l- 0.013 cm 750' 500'250', + 642'+l- u$ I 10 9 TI67 Option 2 o (D v, N !?\,qxòa v,Édo a o ä ı0v, 3(D v,!, F Â) fì ro * urN' ro v) N P Èo\ â¡ tt, .D q¡ a: 6: l;u! ?P NJt! g tse (-¡ã(!q¡ 6 Ê. dt -<v,(t t, A' oä t\)t\¡ ¡\¡ot\¡(¡t + 3ô a jo teo (D t o) o T lD s tn I l! '9!,rtr¡.! * t\)Èo(^, oÀ lJ oo oè\¡ ! o .U ¡¡ Io o d o d cr v, o o¡l CN fI) Jo)o J.¡ ocq) o. $_cÞo tt -s 'u ødOgEå nloo< ã í ã'ãsãEÉoÊ¿ı(ù3A =9ãå ç >e)\oôı Pp oq Þq-à3trto ägÞ<-a6 åg' ô g9o=.0tÈ ã:criô\ 3= È8. Èlqc8¡¿rô c 6ø *Fã+ıB i¡:Fóø ã rDÐ Èoo 39 Êı ä.€ å€xt. t)€ =t¡ıqø3. oø aì ø fDã €6 = lr 6)ı'g HÞã'ã E À¡ão øu,OGË< €È Hı =¡g ô. rt(' ËÊ g8 ttt ñ\Ð ãe.€B È o! otto ë ;'ôø 'E-oô Ê,ãË* fi'ã'q.ã Pc;:(táq g ô o (l ìt(l\öiÂ¡ t¡ É.É stsÐoo ô oøq E¡.È¡tolt ar, -{(Do .| ı É Jo 0)o- o 4. o-oo tDÉ o4 lt Èfotâ!o lttú oêo Þã rd Þflo o ä o 0 o Þ¡ Ð o or' o ? Þ o!) u2É-lo o Év, ¡¡ã(D UtÉrt oôÉÉo a) !) oco .! o, oe oã c)ÞÉ o o Fo € oÞlâ(D o 6 t(D Â¡ôx -r,!¡ Þ. c)oÊ .q ñ .q Þ!! o Ð-ttÉ (Dn!)gE¡ Ètoov, o EÞ v,(¡ oT- v,ox!(D ar,(! U' aã !¡ K('latt, ut c)Ért (DÈ o o (D o ãola(Dâ o o o c!o u, v, (D {Ë o 'ct o E ¡t ttt ot¡ !¡ r'o (t !¡ tD v, A¡ (D v2 'g o ætlt o Ð ItÐ t¡ 9 005 ä (! F (D Customen Sanchez, Guadalupe PlotPlan - ZooDed l¡ ¡¿¿**, TBD Anowhead Dr Rifle, CO Leach Fìeld 17'fl9 *#, Sæptic Tânk 6.2s',31 0'2t 0.13 m 37.5' Parcel#:2403-041-00-047 HomeSize¡26'x48' Subdivision:G6MesaRanch Lot#:52 LotSiæ:46ac Setbads:F:25'R:25'S¡10' CreatedBrSD DâEt6l22l2O23 "- AII measuremen6 generated usinq Garfìeld Counfy G15 Droperu lines Plot plan mß uoÞ d¡e buowirg: Pþpefry lines Ditue hoæ b pþDerty liû6 GeEge/Pole Ban/Shop ú, A/C & A/C Disn¡d Buildowr/shedþoß SetbackDiffiebêmDtuffi Hoæfro¡V!$d@r Drire$'ay w r L Shtæ6 WaEr IiDB/Ciim Well CulæÊ Gð/?mpare Adc Sewr lire SeDtic/eæh field Ditul€.ù ñdd b prcperty ¡iË EæGtrts/R0W HoædeliEryokr¡cdoc. F/F-Faffi PoûbleRffim CC{EWiSDæ.{6 not consistent with the plot pla¡L Signature SalesProfesional- Date Signature Date Arrçnrlrre Kr¡cgtr¡ l!!qD_E_L_lz pw4a$B 3 BEDROOM,28ATTi ACTUALSIZE:4E x26.8' AREA:1,280 SA. FT. t I 48 Ort _,-1SDr Htbh Ref. =æ I D\oN l{lfdl R6f. l_ Irtüt cluttDtt ullñ,llF -_Lúor lryilElrt¡D ør$ttu!ñffi-E'[-E.E5¡ffirwtðÈæ!ñr6 B^fü ð¡ r t f¡úû fã Beonoo¡¡ #3 12'{'x 1t-3' -:\ bUE J s Eúu gt Â g Ë Krrcxer,¡ MlslEn Bronoou 124'x 12'6" Drnrwc 9'-1" x t2'.6' Beonoou #2 ll.f x 10'-3" CP¡E (lßE ArcÉrrllrxr ÈxE THgAn Lrv¡¡re 16'-l x 126" CH¡\t'iDlC) N l.lzt surilßEÊtD. $,EIsa, rD E36tzr rTGÊTnûE Proposed Single-Family O\ilTS System Onsite Wastewater Treatment System Design 3-BR Single-Family Residence Arrowhead Trail Lot 52 Address TBD Rifle, CO 81650 Parcel No. 2403-041-00 -047 Prepared for: CMH Homes Inc. 5000 Clayton Road Maryville, TN 37804 August 2023 Prepared By: ôNest Water En g i neeri ng = consulting Engineers & scientists 251 6 FORESIGHT CIRCLE. #1 GRAND JUNCTION, COLORADO 81 505 (9701 241-7076 -- FAX (970) 241-7097 1.0 SITE CO ITIONS The proposed onsite wastewater treatment system (OWTS) will serve a 3-BR single-family residence on a 46.}-acre mostly vacant rural parcel located at Arrowhead Trail Lot 52, Rifle, CO (Figure A1). The proposed 3-BR OWTS will be served by a new 1,000-gallon septic tank (minimum) and three (3) trenches each with fifteen (15) Q4 Standard Plus units for a minimum l7' x 63' footprint (Figure A2). The trenches will use a total of 45 Standard Plus Quick4 Infiltrator@ units generally oriented east to west in a soil treatment area (STA)/leachfield sloping approximately 5Yo to the north and 4-5% west. ADS Arc 36 chambers may also be used for the leachfield; the three (3) trenches require twelve (12) BioDiffi.rser Arc 36 chamber units in each trench for a total of 36 chamber units. Soils and percolation data were collected by V/estWater Engineering August 7 ,2023 in accordance with Garfield County On-Site Wastewater Treatment System (OV/TS) Regulations (Regulations). Soil profile in the vicinity of proposed STA shows silty sandy loam with some sub-angular clasts in the 3.0- to 7.5-foot interval. The high seasonal water table is estimated to be greater than 8.0 feet below ground surface (bgs). Percolation rates for the 5 percolation test holes completed in the silty sand loam range from 4 to 44 minutes per inch (mir/in) with a 20 minlin average. Site soils are classified as Soil Type 2 in accordance with Table 10-1 of the Regulations based on silty sand loam texture and percolation rates predominantly within the 16-25 mirVin range. The long-term acceptance rate (LTAR) used to design the OWTS (Table l0-1 Regulations) is 0.60 gallons per day per square foot area (gpd/ft2). 2.0 WASTE\ilATER FLO\üS Maximum Daily Wastewater Flow (gpd): 3-BR Dwelling 3 bedrooms x 150 gpd/bedroom :450 g¡rd Septic Tank The minimum required septic tank capacity for a 3-BR dwelling is 1,000 gallons (Table 9-l Regulations). For this design, use a two-compartment septic tank for said volume approved for use in Garfield County. The proposed new I,O00-gallon septic tank will provide at least 48 hours of detention time for influent wastewater flow from the proposed 3-BR single-family residence. The 48 hour (2-day) particle detention time volume requirement is 900 gallons (450 gpd x 2-days : 900 gallons). The internal septic tank inlet and outlet tees must be installed per Regulations. 3.0 O\ilTS DESIGN Silty sand loam occurring at the 1.0 to 3.0 feet depth interval will be used for the upper infiltrative surface for the proposed STA (Figure A3). The shallow leachfield with 3.0 feet depth will keep infiltrative surface above the silty sand supporting sub-angular clasts up to small boulder in size. Shallow STAs promote secondary effluent treatment due to available soil oxygen optimizing bacteria and fungi processes. Trench excavation will remove approximately Page I 3.0 feet of soil and upper root mass to prepare a level surface for installing the infiltrators in the three (3) trenches. Soil should not be wet at the time of excavation. Place a minimum l-foot of final cover (1O-inches per Regulations) using the silty sand loam (minimize rock content greater than large gravel - 2-inch or larger). Final grade shall be slightly crowned over proposed trenches so water runs off and will not pond over any area of STA/leachfield. Prior to backfilling, cover the Q4 infiltrator trenches with non-woven geotextile fabric or similar permeable material to prohibit soil intrusion into the chamber louver vents. All setback distances in accordance with the Regulations are applicable to septic system installation. The septic tank must be at least 5 feet, and STA at least 20 feet from plumbed modular structure(s) with a basement, crawl space, and or footing drains. STA's must be outside of any easements and at least 10 feet from property lines. Setback distances also apply to natural and artificial waterways, including a 50-foot setback from STA/leachfield to open irrigation ditches and natural water bodies. Potable water lines exiting the proposed water supply cistern serving the residence must be 25 feet from the STA/leachfield. The existing cistern and water well must be at least 100 feet from the proposed leachfield per State Water Well Construction Rules unless a variance is granted for the 25-foot minimum setback distance. Designated leachfield repair area must be retained per Regulations as idle land set aside for future use once primary fields fail and no longer accepts wastewater. The new 1,O00-gallon septic tank will provide at least 48 hours of detention time for influent wastewater flow from the proposed dwelling. Internal septic tank inlet and outlet tees must be installed per Regulations. An effluent filter must be installed instead of tee on the septic tank outlet. Use the Orenco Systems Biotube Effluent Filter OSI Model FTW0444-36 or equivalent. Effluent filters typically require cleaning and maintenance evory 6 months. The following design calculations propose to discharge septic tank effluent to three (3) Quick a Plus trenches each using fifteen (15) Q4 units for a total minimum disturbed area of approximately 17 feet by 63 feet with end caps. A total of 45 Quick 4 Standard Plus Infiltrator units will be installed in the 3-Trench System generally oriented east-west using a distribution box for equal effluent distribution to the STAs/leachfield. A total of 36 BioDiffuser Arc 36 chamber units can be used instead of Infiltrators using twelve (12) chamber units in each of the three (3) trenches. Soil Absorption Area Calculations Absorption Area (A) : Design Flow (Q)/LTAR Field percolation rate (t): 4 to 44 min/in Leachfield Area: A: Q/LTAR, Where: A: Leachfield area square feet Q: Design Flow/maximum daily wastewater flow Page 2 : max. daily wastewater flow 3-BR @ 150 gpd/bedroom : 3 bedrooms x 150 gpd/bedroom : 450 (gpd) LTAR: Long Term Acceptance Rate (max. hydraulic loading rate) :0.60 gallons per daylft2 A:450 gpd/0.60 gpdlft2 : 750 ft2 Ouick4 Trench Configuration : 750 ftz x 1.0 (appl. method adjustmentl¡ x 0.7 (distribution media adjustment') : 525 ft' 525 ft2 lL2 ft2 : 43.75 Q4 units; Use 45 Q4 units. 525 f( ll5 ff: 35 Arc36 units; Use 36 Arc36 units 1 Regulations Table l0-2 size adjustment factor for Methods of Application in STAs 2 Regulations Table l0-3 size adjustment factor for Types of Media in STAs Note: County and State approved bottom chamber area for Quick 4 Plus Standard Infiltrator Unit : 12 f(. Bottom chamber area for the BioDiffuser Arc 36 is 1 5 ft2lunit The 3-Trench Q4 Infiltrator System will use a total of forty-f,rve (a5) units. Each trench will have fifteen (15) Q4 Plus chamber units. The 3-Trench Arc 36 System will use a total of thirty- six (36) units with each trench comprised of twelve (12) Arc 36 chamber units. rùy'astewater flow into the proposed trenches will be split evenly using a distribution box completed with a riser at grade. Use the top porl of the Infiltrator or ADS faceplate for all influent piping. 4.0 SYSTEMINSTALLATIONREQUIREMENTS Minimum setback requirements must be in accordance with the Regulations. All sewer pipe couplings must be completed with primed and glued or bell and spigot joints using 4-inch SDR 35 PVC pipe. Schedule 40 PVC 4-inch pipe with a minimum l-foot soil cover must be used if pipe is installed in a vehicular traffic crossing. Drain-waste-vent (DV/V) rated Schedule 40 PVC pipe is called out for crossings but may also be used instead of SDR 35 PVC pipe. Building sewer pipe must be installed at a slope between l/s-inch andl/¿-inch per foot slope (l to 2o/r), preferably using the Yq-inch per foot slope as recommended by the International Plumbing Code (IPC) as administered by the County. Fittings shall be sweep 90-degree curves or two (2) 45-degree elbows at all influent pipe turns. Fittings must be DWV for schedule 40 PVC pipe. Clean-outs (2-way) are required between dwelling and tank and beyond tank where pipe lengths exceed 100 feet from tank to STA/leachfield and at all pipe bends greater than 45 degrees. The installer must adhere to minimum depth requirements for leachfield and ensure gravity drainage into all septic system components to avoid using a lift pump. System components must be placed on native soils or re-stabilized soils in excavated areas. Page 3 Infiltrator trenches must be excavated level to ensure the prepared infiltrative surface is level along the entire length of STA. Solid 4-inch pipe is used in the header network of sanitary tees. The owner will ultimately be responsible for septic system maintenance including pumping the septic tank once every 3-4 years and cleaning the effluent filter every 6 months. 5.0 SYSTEM INSPECTION WestWater Engineering is responsible for inspecting OWTS to ensure construction conforms to the design plan and meets all aspects of County Regulations including: o Inspect system prior to backfilling including piping and septic system components. o Complete an as-built drawing of the system. 6.0 DESIGN LIMITATIONS The OIWTS design is based on site-specific soil conditions and percolation data collected in the vicinity of the proposed STA/leachfield and local experience of designing OWTS's in Colorado. The design is only valid for the proposed new OWTS serving the proposed single-family residence at the referenced location provided in this report. WestWater Engineering assumes no liability for inaccurate information or conditions that vary from the design assumptions listed above. Notify'WestWater Engineering and/or the Garfield County official immediately if actual site conditions differ from those assumed herein. Please do not hesitate to contact us if you have any questions regarding this report. Respectfully, Dean Goebel, M.S., P.G. Hydrogeologist Reviewed By: Keith Mendenhall, Page 4 APPENDIX A SOILS AND PERCOLATION DATA ^Nest Water Eng i neeri n g = consulting Engineers & scientists 2516 FORESIGHT CIRCLE, #1 GRAND JUNCTION, COLORADO 81505 1970)241-7076 -- FAX (970) 241-7097 A1. SOILS AND PERCOLATI REPORT Date:August 7,2023 Consultant Dean Goebel, M.S., P.G. Hydrogeologist WestV/ater Engineering 2516 Foresight Circle #1 Grand Junction, CO 81505 (970) 24r-7076 Client:CMH Homes lnc. 5000 Clayton Road Maryville, TN 37804 Land Parcel: Arrowhead Trail Lot 52 Address TBD, Rifle, CO 81650 2403-041-00-047 A2. SOLS LOG Site soils were investigated at the 46.0-acre mostly vacant ranch parcel to collect site-specific design criteria for an onsite wastewater treatment system (OWTS) to serve a proposed 3-BR single-family dwelling located at Arrowhead Trail Lot 52, Rifle, CO. Percolation testing procedures were conducted in accordance with Garfield County On-Site Wastewater Treatment System (OV/TS) Regulations (Regulations). The Percolation Test Site is located approximately 450 feet south of the north property line and220 feet west of the east property line (Figure Al). The proposed soil treatment area (STA)/leachfield is located east of the proposed 3-BR dwelling in an area sloping about 5o/o northto northwest. The excavated soils observation pit shows silty sand loam overlying chalky silty sand loam supporting sub-angular pebble to boulder sized clasts down to 7.0 feet. Groundwater was not encountered in the 7.5-foot soils observation pit. Estimated high seasonal groundwater is greater than 8.0 feet. The soils profile log is summarized below and in Table ,A'1. Very dark brown (1OYR 212) silty sand loam from 0-l .7 feet. The silty sand loam becomes white to pinkish white color (lOYR 8/1 to 7.5YR 812) from I.7 -3.0 feet due to the presence of highly disseminated calcite and gypsum evaporites indicative of the effective depth of evapotranspiration. Mottled silty sand ranging in color from 60% strong brown (7.5YR 516) to 40% pinkish white (7.5YR 8/2) supporting some sub-angular pebble- to small boulder sized clasts occurs from 3.0-7.5 feet maximum depth of excavation. Groundwater was not encountered in the 7.5-foot soils observation pit with an estimated seasonal high water table greater than 8.0 feet. The lack moisture and presence of low chroma soil coloring indicating prolonged saturation near the 7.5-foot depth interval supports the greater than 8.0 feet estimate for high seasonal groundwater. AI Table 41. Soil Log Description vf : very fîne; f : fine; m: medium and; crs : coarse for sand sized particles Percolation rates summarized in Table A2 show arange from 4 to 44 minutes per inch (min/in) with an average of 20 min/in. Based on percolation data, macroscopicltactile soil analysis and maximum depth of excavation, the bottom of leachfield (top of infiltrative surface) should be no deeper than 3.0 feet to avoid silty sand soil with sub-angular clasts. Maximum leachfield depth per the Regulations is 4.0 feet. Site soils are categorized as Type 2 soils based on silty sand loam, granular structure, and percolation rates predominantly falling within the 16-25 min/in range. Soils should not be excavated under wet conditions to avoid compaction and smearing leading to a reduction in permeability. Table 42. Percolation Test Results Depth Interval (ft)Soil Description 0-l.7 Very daik brown (1OYR 212) silty sand (vf)' loam matrix; high OM; granular structure; dry; rabbitbrush, sagebrush, native grass, and pinjon- juniper desert vegetation t.7-3.0 White to pinkish white (1OYR 2l2to 7.5YR 8/2) silty sand (f-vf)' loam chalky due to highly disseminated calcite and or gypsum evaporites; low to moderate OM; granular structure; dry 3.0-7.5 Strong brown and pinkish white mottled soil (10YR 516 60% and 7.5YR 812 40%) silty sand (f-vf) supporting some sub-angular pebble- to small boulder-sized clasts; granular structure; dry ID Depth (ft) Time Final Drop (in) Percolation Rate (mirVin) 10:05 (start) l0:35 1l:05 11:35 l2:05 (end) I 2.0-2.9 4.0"5.0"6.0"6.875"7.75"3.75 32 2 2.0-3.0 3.25"4.375"5.0"5.625"6.0"2.75 44 J 2.0-1.0 6.s',10.5'12.0'dry dry 5.5 ll 4 2.0-2.9 4.5"7.5"dry dry dry 3.0 10 5 2.s-3.5 3.125"4.J5"6.0"dry dry 2.87s 21 6 3.2-4.0 6.0"10.0" @ 10:20 dry dry 4.0 4 A2 APPENDIX B FIGURES SANCHEZ GUADALUPL 3 D &j 42 3 240J-04t-00-047 TRA|L LOT SLOPE 5 NORTH FIGURE A1 ÂRROW.{FAD TRAII I OT 52 EXISTNG OWTS SITE PLAN frþtûrlestli/'âte¡. Englneerlng 25 l6 Forcsight Circle, #l Grand Junction, CO 81505 (970) 241-7076 www.wcstwatcrco.coln EXISTING PARCEL ACCESS ARROIIrTEAD ïRA4L EXISTING WATER SUPPLY SOILS AND PERCOLATION TEST SITE ñ çCISTERN 10 FEET SOUTH OF +SLOPE 4-5% WEST Is\Þ EXISTING CAMPER SITE OUTBUILDING STRUCTUR ED PROPOSED BR SINGLE-FAMILY LLING \ \ APPROXIMATE EXISÌNG PROPERTY L|NE \(46.08 ACRES) ì \ \ ì \ \ I I i ì .l 400 200 0 SCALE: '1":4OO' 400 ARROWHEAD TRA4L ^\llestYltâte¡= Engineering 2516 Foresight Circle, #l Grand Junction, CO 81505 (970) 24t-7076 wtryw.westwaterco.com FIGURE A2 ARROWHEAD TRAIL LOT 52 PROPOSED OWTS LAY-OUT EXISTING PROPERTY LINE EXISTING WATER SUPPLY WELL & CISTERN 10 FEET SOUTH OF WELL 380+ FEET FROM PROP LEACHFIELD NOTE: Q4 INFILTRATOR TRENCHES 3 TRENCHES 15 Q4 UNITS EACH 4s TOTAL Q4 CHAMBER UN|TS (AS SHOWN) OR 3 TRENCHES 12 ARC 36 CHAMBERS EACH 36 TOTAL ARC56 CHAMBER UNITS NOTE: MTNTMUM HOUSE SETBACI(S (FT) SEPTIC TANK 5' LEACHFIELD 20, COVER INFILTRATORS WTH GEOTEXTILE FABRIC PROPOSED 5-BR SINGLE_ FAMILY DWELLING LEACHFIELD REPAIR AREA 17' x 63' 2-WAY INSTALL TRENCHES LEVEL ALONG TOPO_ GRAPHIC CONTOURSCLEANOUT PROPOSED NEW 1,OOO GALLON SEPTIC TANK (MIN)DRIVEWAY 60300 SCALE: 1":60 60 FIGURE A5 ARROWHEAD TRAIL LOT 52 OWTS CROSS SEC]TON ^\l{estl/llâte¡êEngineering 2516 Foresight Circle, #l Grand Junction, CO 81505 (970) 241-7076 rilww.westwaterco.com USE TOP FACEPLATE PORT PROPOSED 3 INFILTRATOR TRENCHES COVER WTH GEOTEXTILE FABRIC PRIOR TO BACKFILLING CROWN BACKFILL OVER OWTS TRENCHES EXISTNG GROUND SU ¡r) î.,I 4t 4 rO r\ MAXIMUM DEPÏH 3.0 FEET MINIMUM DEPÏH 1.0 FEETINSTALLAÏON NOTES: 1) FOLLOW MANUFACTURERS TNSTRUCTTON ww w. in fil tro tors¡ætem s. com 2) SCREW P|PE tN TOP PORT CHAMBER FACEPLATE 3) SCREW FACEPLATES AND UNITS TOGETHER 4) TNSTALL MONTTORTNG PORTS TRENCH ENDS ALL FOUR BED CORNERS SCALE,I,,=5, \7 9o Á<n>Àf'ìlo a >o>Þz<:l<ôu)(t)