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Ord 10-B Amend Ord 4 Regulation of Building ConstructionVILLAGE OF MENDOTA HEIGHTS Dakota County., Minnesota AMENDMENT TO BUILDING CODE ORDINANCE AN ORDINANCE AMENDING AN ORDINANCE TO REGULATE, THE CONSTRUCTION OF BUILDINGS The Village Council of Mendota Heights ordains as follows: (1) Ordinance No. being an ordinance to regula'Ce the construction of buildings enacted April 16, 1956 and published May 17., 1956, is hereby amended in the following respects. (A) Section 1.1 thereof is amended to read as follows: "1.1 Before proceeding with the construction, enlargement., alteration, repair or removal of any building or structure., or with the con- struction or reconstruction of any sanitary sewage disposal system, the owner �or­hls- agent shall first obtain a permit for such purposes from the Village Clerk and shall pay the fees as required." (B) Section 1.5 thereof is amended to read as follows: "1-5 Application for permitzhall be accom- panied by three copies of a lot plan, drawn to a scale not smaller than 1/8 inch per foot, showing with reference to lot lines, for the property with respect to which a permit is sought and for all property located within 100 feet of any portion of the property for which the permit is sought, the location of all existing structures, driveways, wells, water mains and water service lines., sewer lines., septic tanks., distribution boxes., seepage,tiles., dry wells, natural and arti- ficial bodies of water and surface drainage systems, and showing also, with respect only to the property for which a permit is sought., such of the foregoing items as are proposed for construction,, enlargement, alteration., etc. and, in addition thereto, the location of contemplated future items of the foregoing nature, not to be covered by the permit for which application is currently being made, The applicant shall submit data on soil con-- ditions and ground slope, and, where a sewage disposal system is to be installed in fill area, compaction tests shall be submitted. Applicant shall further provide such other I - 2 - pertinent '.sketches as may reagbnably.be re­ ,quested by'the-.Village Clerk., Village Engineer or Building Inspector,," (C) section 1.6 thereof is amended to read as follows: P1,6 Upon request for a permit, the Village Council shall refer all plans and specifica- tions to the planning commission which shall return its recommendation to the Village Coun- cil within ten days; provided that-in any case where.the permit is•to include the construc- tion or reconstruction of a sewage-disposal system upon a lot consisting-ofleas than twenty thousand square fe,et,.-one copy of the lot plan shall be submitted to the Village* . Engineer for the determination of-suchtests as may be required under Article IV hereof, the.expense of-which test-s..shall be borne by the applicant for permit. Upon receipt of'the recommendation of the planning.board and; where applicable,, the.recommendation of the Village Engineer-, the Village Council shall ,approve -or reject the application for permit and instruct the Village Clerk to issue or deny a permit." (D) Section 3.62 is amended to read as follows: - 3" "3.62 The type, construction and location of sewage disposal systems shall be in accordance with the provisions of Article IV hereof," (E) Section 3.63 is hereby repealed (F) Article IV hereof is amended by changing the de- signation thereof to read "Article V'1 and,by renumber- ing Sections 4.1 through 4.21 as Sections 5.1 through 5.21. - G) There is added a new Article IV reading as follows: "ARTICLE IV "INDIVIDUAL SANITARY SEWAGE DISPOSAL SYSTEMS "A6 SEPTIC TANKS "4.1 Tank must be at least 10 feet away from any public or community water main; house ser- vice or dwelling. Tank must be at least 15 feet inside lot line. Tank or any portion of drain field shall be minimum 50 feet from any well. "4,2 Septic tank shall have a minimum capacity of 750 gallons for a two-bedroom residence or less with an additional 125 gallon capacity re- quirement for each additional bedroom, future bedroom or combination den-guest bedroom. The liquid depth of any tank or compartment thereof , 4 - shall not _.be, less,-thah..4 -feet and a;. liquid depth greater than•&-1/2.feet -shall not be considered-An ... de.termining'the.tank.capacity. No tank or compartment thereof shall have an inside horizontal dimension less than 36 in- ches. The first..'compartment in a multi-com" partment tank or the first tank in a multiple tank system shall not.,be less than 500,gallons or leas than one-half of the gross volume when necessary septic tank volume exceeds 1000 gal- lons. Septic tanks shall be of a design ap- proved by the Minnesota State Department of Health. See. section 4.49 for, requirements. on garbage disposal units., "4.3 Tank must be made of. either. -14. gauge. steel, poured or precast.monolithic concrete;..- concrete is preferred. Steel tanks.must be provided with a properly applied bituminous protective coating on both the interior and exterior surfaces. "4.4 Design of tank, baffles, and..-Inspection'. openings shall be sized as recommended.by.the, Minnesota State Department of Health. Varia- tions may be approved by the Village Engineer if they are.substantially in conformation. - 5 - I "4.5 There.shall be a cleanout or inspection opening extending from the top of the tank to the surface of the ground, Opening shall have a removable tight seal or plug at the ground surface. "B. SEEPAGE SYSTEM `4.6 A concrete distribution box of sufficient size (minimum 18 inches by 18 inches, inside di- mensions) to accommodate the necessary number-of laterals, shall be constructed at the head of each seepage system. "4.7 Each lateral shall be connected separately to the distribution box and shall not be sub- divided. Ends of laterals shall not be inter- connected. Each the branch shall terminate separately in a minimum 24" dia. inspection manhole. The trench serving each the line within three (3) feet of the inspection man- hole shall be excavated only to the depth of the the line., the lower half of the last the in each line shall be filled with concrete or some other material to serve as a dam. 114.8 All outlets and the floor of the distri- bution box shall be at the same elevation. The -- 6 - bottom of the inlet shall be two (2) inches above the floor. There shall be a baffle in front of the inlet. 114.9 The sewer from the septic tank to the distribution box and the feeders from the dis- tribution box to the laterals in the seepage system shall be constructed of vitrified bell- and-spigot the with cemented joints or cast iron pipe. The pipe shall be laid on a grade of 6 inches per 100 feet. "4.10 Sewer lines to the septic tank and from the septic tank to the distribution facility at the seepage field where located under drive, ways or structures shall be constructed of cast iron. '4.11 Seepage system laterals must be at least: "(a) 10 feet from water mains or service pipes constructed of brass., lead, copper, or mechanical-joint cast iron. t'(b) 25 feet from water.mains or service pipes constructed of cast iron with leaded joints. "(c) 35 feet from water mains or service pipes constructed of material other than described in (a) or (b) above. - 7 - "6.12 Seepage system must be at least 25 feet away from any .ditch, stream,' or drain. "6.13 Laterals and inspection manholes in the seepage system shall not be closer than ten (10) feet to any lot line or dwelling. "4.14 Seepage.system shall consist of a mini- mum of 480 square feet of seepage trench. If a residence contains more than 3 bedrooms or if percolation tests show a seepage rate of less than 1 inch in 15 minutes,-the minimum area of seepage trench shall be the amount.set forth.in the table "Minimum Area of Seepage Trench ". The.porosity of soil shall be.deter- mined by means of percolation tests as prescribed below. "6.15 Percolation tests showing the ability of the soil to absorb septic.tank effluent shall be made in accordance with Part C hereof and the results submitted to the Village Clerk or Village Engineer of Mendota Heights. t "6,16 All trenches in a seepage 'system shall comply with the following standards: "(a) Minimum total length of seepage trench M -» 160 feet "(b) Minimum diameter of the 4 inches - 8 - `,'(c) Opening .between ends of the 1/4 to 1/2..inch "(d) Minimum number of laterals per field 2 ','(e) maximum length of individual L lines 100 feet '.'(f) Bottom width of trench 24 to 36 inches "'(g) Maximum depth of cover over the lines 36 inches 't. (h); Preferred depth of cover over the lines M 18 to 24 inches "(i) maximum grade of tile lines 6 in. per 100 feet;, Minimum grade of the lines - -.1 no per 100 feet "(j) Preferred grade of the lines 2 in. per 100 feet tt (k) the the shall espec Minimum depth of trench.fill,under - 6 inches Minimum depth of trench fill over - - 2 inches Bottom areas of separate trenches be as nearly equal as practicable., Tally where the fields are placed in ground with appreciable slope. - 9 - `(n) Spacing of trenches - center to center. - - 10 feet "4.17 Grade boards, securely staked in the bottom-of the trench, shall be provided for all drain lines. "4.18 Where necessary to maintain proper grade and cover.,,lines may be terraced by use of suitable brick and concrete drop boxes, or I ells with cemented- joints, "4.19 Trench fill shall be crushed stone or gravel. Stone or gravel shall be free of dust, ,sand., clay, or fine material, Trench fill shall be well graded from 1/4 to 1-1/2 inch in size. "4.20 Upper halves of joints are to be covered with pieces of asphalt treated.paper. 114.21 After placing rock or gravel over tile, cover same with untreated building paper and backfill trench with solidly tamped earth. "4.22 The trench fill shall completely encase the the as previously described, except that seepage trenches constructed within 10 feet of large trees or dense shrubbery shall have at least 12,inQhes of absorption material beneath the tile. - 10 - "4.23 Over the inspection manhole there shall be con- structed'a reinforced concrete top.$ at least 4 inches thick., bearing-at least 6 inches on soil outside of the pit, with a watertight concrete manhole and cover. Where possible, the top shall be 6 to 12 inches below the ground surface. 114.24 The depth of normal ground water below the bot- tom of the seepage trench shall not be less than two (2) feet. The !normal! ground water level for the pur- pose of the . above requirement is to be considered at that depth below the ground surface where water is en- countered during a normal dry period and between the dates of June 1 and October 1 in any year. "4.25 The lot area proposed to be occupied by a sep- tic tank and the seepage field shall be free from inundation due to ponding of storm water in depressions or on flat areas or due to flooding from streams or other drainag& channels. '..'4.26 Rough and finished grading of such areas shall be so executed with respect to elevation and slope that surface drainage is off the area and away from all nearby wells. 114.27 If fill material is to be placed over any part of the seepage field area or within 10 feet thereof to a depth of'18 inches or more it shall be done as fol- lows: '.'(a) Porous material only shall be placed over tl-e seepage field area and for a distance of 10 feet beyond the end of the laterals. ','(b) For a distance of 10 feet beyond the porous fill impervious material shall be placed and com- pacted in such a manner as to prevent leaking at the toe of the slope. 11(c) If the seepage system is to be installed within 6 months of completion of the filling opera- tion, then the fill shall be placed in 6" layers and compacted in such a manner that the tile lines shall not settle out of the required vertical alignment. "4.28 Seepage and other tile trenches shall be back- filled and the finished grading of the seepage field area shall be done only by hand or by such other methods as do not involve vehicles rolling over buried tile lines. "4.29 After backfilling of trenches the septic tank and seepage area shall be brought to a finished grade and effectively fenced and marked with signs to pro- hibit passage of trucks and other vehicles. The fence and signs shall be maintained throughout the balance of the construction., grading and landscaping period. -12- "C. PROCEDURE FOR PERCOLATION TESTS 1.14-30 six or more tests shall be made in separate test holes spaced over the proposed seepage field site as directed by the Village Engineer. '.'4-31 Dig or bore a hole, with horizontal dimensions of from 4 to 12 inches and vertical sides to the depth of the proposed seepage trench. In order to save time, labor and volume of water required per test, the holes can be bored with a 4 inch auger. ','4.32' Carefully scratch the bottom and sides of the hole with a knife blade or sharp pointed instrument, in order to remove any smeared soil surfaces and to provide a natural soil interface into which water may percolate. Remove all loose material from the hole, Add 2 inches of coarse sand or fine gravel to protect the bottom from scouring and Sediment, "4.33 Carefully fill the hole with clear water. By refilling if necessary, or by supplying a surplus reservoir of water, such as an automatic siphon, keep water in the hole for at least four hours, and preferably overnight Allow the soil to swell overnight. The saturation procedure is intended to give the soil the opportunity to swell and approach the condition that will prevail during normal operation of the seepage system. -13- "4.34 Percolation or seepage rate measurements shall be made on the day following the procedure described under the preceeding section. Add clear water to bring the depth of water in the hole to approximately 6 inches over the gravel as necessary. From a fixed reference point (a board laid across the top of the hole can be used), measure the drop in water level at approximately 30 minute intervals for at least four hours, refilling to 6 inches over the gravel as necessary. The drop that occurs during the final 30 minute interval, if representative of a constant rate,, is used to calculate the percolation rate. If not representative, consideration shall be given to the drops which occurred during previous 30 minute inter- vals. Unless a constant rate has been reached, the test shall be continued. Record the results of the tests on forms similar to.thosb supplied by the Village Clerk of,Mendota Heights. "4.35 compute an average of the representative seepage rates in the six or more tests made. Con- sult table (below) to determine necessary area of seepage trench. -14- MINIMUM AREA OF SEEPAGE TRENCH Seepage rate: minutes for Square feet of trench for residence of Water to -fall one inch 3 bedrooms or less 4 bedrooms 5 bedrooms 15 (or less) 48o 630 78o 16 to 20 760 950 1110 21 to 25 830 1040 1200 26 to 3o goo 1125 1305 31 to 35 970 1210 1410 36 to 40 lo4o 1300 1510 41 to 45 1110 1390 1610 46,to 50 118o 1475 1710 51 to 55 1250 1560 1810 56 to 6o 1320 1650 1915 over 60 Unsuitable for seepage system 114.36 For residences containing more than 5 bedrooms and for all other uses, special consideration shall be given, and the required area shall be determined by the Village Engineer. "D. DRY WELLS 1114-37 A !Dry Well! as des . cribed herein is also com- monly referred to as a !Cesspool! or !Seepage Pitf. "4.38 A dry well may be used as a substitute for a seepage system, as previously described herein, for effluent from a septic tank. It shall not be used as a substitute for a septic tank. "4.39 The dry well, as defined herein, shall be a vertical circular opening in the ground constructed by the use of brick, stone, concrete block or similar materials as a lining, said.lining to be at least 3 inches thick with 2- to 4-inch open joints below the liquid inlet. It shall have an open bottom. -15- "4.40 The dry well shall have a reinforced concrete top, at least 4-inches thick,. bearing on the wall and extending at least 6 inches outside the well. The.top shall.be provided with a watertight concrete manhole cover or the top shall be constructed in sections for easy access into the well. There shall be a cleanout or inspection opening extending from the top of the well to 6'," above the surface of the ground,, ','4.41 Dry wells shall be located not less than the stated minimum distances from the following: "(a) Any private or public well - 75 feet 'I(b) Any water supply lines - 50 feet "(c) Dwellings -.20 feet '.'(d) Other structures, lot lines, and driveways 10 ft. "(e) Other existing or abandoned dry wells - 3 times the average diameter —edge to edge "4.42 Dry well absorption area shall be calculated as the side area, below the inlet, exclusive of any un- suitable soil formations. "(a) The determination of the required effective absorption area based on the depth of dry well required shall be made by the use of a test hole or holes which will indicate the soil strata at the proposed location for the well. This test information shall be comp$led and submitted with the plot plan to the Village Engineer for deter- mination of the feasibility of using a dry well -16- for waste disposal as well as its size and depth, The expense of such tests shall be borne by the applicant. '.'(b) Required seepage area shall be determined in accordance with the following table: Character of Soil Coarse sand or gravel Fine sand Loamy sand and silt with very little clay (less than 50) Sandy loam silty) - Sandy loam �clayey) Clay with considerable gravel or sand Clay with small amounts of gravel or sand Heavy tight clay, hardpan, rock or - other impervious formations ' Effective absorption area requirement in square feet of wall area of well ex- clusive of curbing, per bedroom 20 50 100 200 300 400 500 unsuitable As a further clarification, the particle sizes of the various soils are as follows: Sand - Under 10% passing the #270 sieve. Loamy sand - From 10 to 20%.passing the #270 sieve. Sandy loam - Over 20% passing #270 sieve.but also the sand content shall be over 50% The character of soil in the above table is based on the U.S. Bureau of Soils Classification. "(c) A minimum of 4 feet of porous formation for each installation shall be provided in one or more wells. Where soil porosity is questionable, at least 20 feet of vertical depth below inlets shall be provided in one or more wells. -17- "(d) Dry wells less than 20 feet deep shall have a minimum diameter of 4 feet. "(e) The bottom of any dry well shall terminate notule5s than 10 feet above the normal ground water table as defined in Section 4024. "E. GENERAL PROVISIONS "4.43 Downspouts . shall not discharge to the sewage disposal system. 114.44 Sumps of any construction shall not be located within 25 feet from a well. Sumps for collection of basement wastes must be constructed of reinforced concrete, 6 inches thick, where within 75 feet of a well. "4.45 separate sump pumps shall be used for collec- tion of drainage from foundation footing drains and from laundry, and floor wastes. Laundry and floor wastes shall be discharged into the septic tank, however, no footing drainage will be permitted. This type of drainage shall be discharged onto the ground surface outside the dwelling. Toilet wastes shall not be discharged into a basement sump unless a sump and sump pump designed for this purpose is provided. "4.46 Basement drain must discharge to the sewer or sump leading to the septic tank. M "4.47 Minimum size of the house sewer and house drain shall be 6 inches if sewer is of vitrified clay, 4 inches if sewer is of cast iron. Minimum slope shall be 1/4 inch per foot for 4 inch pipe., 1/8 inch per foot for 6 inch pipe. "4.48 Grease traps and catch basins, if used., unless located inside the dwelling and above the floor, must be located at least 50 feet away from any well or 10 feet from any water pipe and must be constructed as described elsewhere in these specifications. Outflow from grease traps or catch basin must discharge into the sewer leading to the septic tank. "4.49 Where household garbage grinders are installed or contemplated in conjunction with individualsewage disposal systems, the minimum liquid capacity of the septic tank., the minimum length of tile drain field and minimum requirements for dry wells, as specified in the preceding parts of this Article IV shall be increased by 50%. "4.50 On new construction, the owner should give consideration to the installation of a future sewer service line under the basement floor toward the street in front of the dwelling in the event of the installa- tion of a municipal sewer collection system. Any such line shall be temporarily plugged at both ends to pre- vent the entrance of fureign matter prior to its being placed in use. -19- 1114.51 All plumbing installed hereafter in buildings subject to the jurisdiction of these regulations shall be designed and installed in accordance with the re- quirements set forth in the Minnesota Plumbing Code.as amended. "4-52 If changes from the approved design, layout, specifications for grading submitted for a building permit are necessitated by unforeseen conditions or for other reasons, the changes in design, layout and grading shall be submitted to and approved by the Village Engineer. "4.53 The installer of each individual sewage disposal system shall certify, according to an approved form, that it has been made in accordance with the approved plot plan, other drawings and specifications as re- quired herein. "4-54 A permanent print of the plot plan and drawings, or a photostat thereof made to an approved scale, showing the actual installation shall be permanently mounted under glass in the utility room or basement of the house. '4.55 An instruction card shall be permanently mounted under glass in the utility room or basement of the house which sets forth the following: limitations in the use of a plumbing system that is connected to an -20- individual septic tank sewage disposal system; limita- tions in the use of the lot area over the tile seepage field; instructions on inspection, cleaning and main- taining the septic tank; possible reasons for improper functioning of the system should it occur and possible remedies,, including relocation of the seepage the lines. All such instruction cards shall be approved by the Village Clerk.or Village Engineer. (H) Section 5.1 thereof (designated as Section 4.1 prior to the amendment made by paragraph (F) hereof) is amended to read as follows: !'5-1 No dwelling shall be constructed upon a lot or building plot that does not have an area of 10,000 or more square feet where public sewage disposal exists, or an area of 15,000 or more square feet on lots having a private or individual sewage disposal system.'.' (I) Section 5.18 thereof (designated as Section 4.18 prior to the amendment made by paragraph (F) hereof) is amended to read as follows: "4.18 The requirements stated in this code repre- sent minimum standards. The Village Council will recognize and permit all construction that exceeds these minimums. Where the Council finds that extreme hardship will result from strict enforcement of all provisions of this ordinance., it may waive compliance -21- with specified sections, upon such conditions as it may impose provided that it is not contrary to the public health or public welfare to do so.',' (2) This ordinance shall take effect and be in force from and after its passage and publicationrd Enacted and ordained into an ordinance this day of Q 1956. I (Seal) Att�Gt: Clerk THE VILLAGE OF MENDOTA HEIGHTS Mayor -22-