PLAN REVIEW GUIDELINE FOR ON-SITE WASTEWATER SYSTEMS (OWTS)

Transcription

1 PLAN REVIEW GUIDELINE FOR ON-SITE WASTEWATER SYSTEMS (OWTS) Rancho Cucamonga is located within the SANTA ANA REGION OF THE CALIFORNIA WATER QUALITY CONTROL BOARD. This board has approved the Local Agency Management Program (LAMP) adopted by Ordinance 911 by the City of Rancho Cucamonga on June 21, 2017, effective August 21, 2017 For this reason, the following are requirements necessary for the design plan check and inspection of on-site wastewater treatment systems (OWTS): Should there be a discrepancy between this handout and the Local Agency Management Program (LAMP), the requirements in the LAMP shall prevail. Approved by: Jim Barrett, CBO Interim Building Official Page 1 of 28 REVISION A:

2 This handout is a summary of the Local Agency Management Program for On-site Wastewater Treatment Systems (LAMP OWTS). For further information the reader is directed to the LAMP OWTS document available on the City of Rancho Cucamonga Building and Safety Services Department webpage, and is available for review at the Building and Safety front counter. The following design criteria may be used for the sizing of a replacement existing OWTS. If a percolation test has been performed please see the sizing requirements based on a percolation test in the LAMP OWTS. For new OWTS please see the requirements in the LAMP OWTS. DESIGN CRITERIA FOR PRIVATE SEWAGE DISPOSAL SYSTEMS For Systems Without a Percolation Test Check Sewage Rate Map for Minimum Depth of Seepage Pits and the website: for the maximum depth of the seepage pits Septic Tank Capacity (Gallons) Disposal Field Leach Area Required 3 Ft 18 Below Leach Line Width x Length 5 Ft 24 Below Leach Line Width x Length Field Design at 60 Square Feet / 100 gallons (See notes: 1, 2, 3, 4, & 6) 7 Ft 36 Below Leach Line Width x Length Size of Seepage Pit Required (Diameter x Depth) (See notes: 3, 4, 5 & 6) Pit design at 60 Square Feet / 100 gallons 1, (2) 3 x 100 (4) 5 x 55 7 x x 39 6 x 32 7 x 28 1, (1) 3 x 100 & (2) 3 x 70 (4) 5 x 66 (4) 7 x 52 5 x 46 6 x 38 7 x 33 1, (3) 3 x 100 (3) 5 x 82 (3) 7 x 70 5 x 58 6 x 48 7 x 41 Field Design at 90 Square Feet / 100 gallons Pit design at 90 Square Feet / 100 gallons 1, (3) 3 x 100 (2) 5 x 100 (3) 7 x 64 5 x 58 6 x 48 7 x 41 1,200 1,080 (4) 3 x 90 (3) 5 x 72 (3) 7 x 78 5 x 69 6 x 58 7 x 50 1,500 1,350 (5) 3 x 90 (3) 5 x 90 (2) 7 x x 86 6 x 72 7 x 62 Notes: *Absorption Perimeter 1. Other variations may be allowed to width and depth so as to achieve the required leach area. 2. Trenches shall not have less than 300 sq. ft. of infiltrative area. 3. All deviations from this handout will require a percolation test with a designed septic system by a licensed Civil Engineer. 4. Depth of the seepage pit shall be measured from the bottom of the pit to the invert of the distribution pipe. 5. Multiple seepage pits may be used. If this is the case, the required depth from the table above can be divided equally among the numbers of seepage pits. In no cases the depth of seepage pits can be less than the "minimum depth. 6. For design and construction requirements see the Local Agency Management Program Chapter 8 Leach Line Systems, Chapter 9 Vertical Seepage Pit Systems and Chapter 10 Horizontal Seepage Pit Systems. Page 2 of 28 REVISION A:

3 The following diagram shows the general soils types in the City and the allowable percolation rate without a site specific percolation test. Page 3 of 28 REVISION A:

4 The following table is excerpted from the Local Agency Management Program (LAMP OWTS): Table 3-1 Minimum Setback Required From (feet) Septic Tank Disposal Field Seepage Pit Non-Public Water Supply Well 1, Public Water Supply Well Buildings or Structures Property line including Street Right of Way Line Streams and other flowing bodies of water Drainage Course Lakes, ponds, and other surface water bodies Large Trees Seepage pits Disposal field On-Site domestic water lines (building service line) Public Domestic Water Lines Distribution Box n/a 5 5 Ground surface on sloping ground n/a Groundwater Drainage system will clear domestic water supply wells by not less than 50 feet. This distance will be permitted to be reduced to not less than 25 feet where the drainage system is constructed of materials approved for use within a building. 2. For any system discharging 5,000 gallons per day (GPD), or more, the required setback will be increased to 200 feet. 3. Includes porches and steps whether covered or uncovered, breezeways, roofed porte cocheres, roofed patios, carports, covered walls, covered driveway, and similar structures or appurtenances. 4. Any tree with a trunk diameter of one foot or more within 5 feet of the system that will not be removed during construction. 5. The highest known level to which groundwater is known to have occurred rather than the level at the time when testing occurred, : 6. Plus 2 feet for each additional foot or depth in excess of 1 foot below the bottom of the drain line. 7. For any system utilizing Alternative Treatment Systems and Sewage Holding Tanks (See LAMP Chapter 11), this minimum separation may be reduced to 2 feet with approval under the Advanced Protection Page 4 of 28 REVISION A:

5 Management Program (APMP) (refer to Chapter 11: Tier 3 - Advanced Protection Management Program for Impaired Areas for more information regarding the APMP) and the Regional Water Quality Control Board (RWQCB). 8. Unless regulatory or legitimate data requirements necessitate that monitoring wells be located closer. 9. Where the edge of the water body is the natural or levied bank for creeks and rivers, or may be less where site conditions prevent mitigation of wastewater to the water body. 10. Where the edge of the water body is the high water mark for lakes and reservoirs and the mean high tide line for tidally influenced water bodies. The following diagrams are visual illustrations of the separation requirements. Page 5 of 28 REVISION A:

6 SEEPAGE PIT SEPARATION DWELLING 2 FT. MIN. CLEAN OUT GATE VALVE 5 FT. MIN. DRIVEWAY 10 FT. MIN. 5 FT. MIN. SEPTIC TANK WATER MAIN 100 % EXPANSION PIT 5 FT. MIN. 8 FT. MIN. 5 FT. MIN. 12 FT. MIN. DISTRIBUTION BOX WATER METER 5 FT. MIN. 8 FT. MIN. 10 FT. MIN PROPERTY LINE OR STREET RIGHT-OF-WAY 20 FT. MIN. CURB NOT TO SCALE Page 6 of 28 REVISION A:

7 SEEPAGE PIT SECTIONAL VIEW See LAMP Chapter 9 INSPECTION PORT: TO GRADE IN CONCRETE OR 6" BELOW GROUND 3 FT. - 4 FT. 2 % MIN. 3 FT. - 4 FT. BOTTOM OF LID 2 % MIN. INVERT OF DISTRIBUTION PIPE ( ) FT. EFFECTIVE PIT DEPTH IF PIPE ENTERS TOP OF PIT 4 FT. ( ) FT. EFFECTIVE PIT DEPTH IF PIPE ENTERS SIDEWALL OF PIT 6" - 18" ROCK 1 FT 5 FT. - 7 FT. 10 FT MIN. GROUND WATER NOT TO SCALE Page 7 of 28 REVISION A:

8 LEACH LINE SEPARATION DWELLING GATE VALVE 2 FT. MIN. CLEAN OUT 5 FT. MIN. DRIVEWAY 10 FT. MIN. 5 FT. MIN. SEPTIC TANK 5 FT. MIN. DISTRIBUTION BOX 100 % TRENCH EXPANSION 8 FT. MIN. 5 FT. MIN. 5 FT. MIN. 10 FT. MIN. WATER METER 5 FT. MIN. 200 FT MINIMUM DIVIDED BY NO. OF TRENCHES 5 FT. MIN. PROPERTY LINE OR STREET RIGHT-OF-WAY CURB * See LAMP Chapter 8 Leach Line Systems, Dimensions Item 4 NOT TO SCALE Page 8 of 28 REVISION A:

9 Example 1 LEACH LINE SECTIONAL VIEW See LAMP Chapter 8 3 FT. A.P. (ABSORPTION 12" 10 FT. ON CENTER SEE CH.8 " LEACH LINE SYS." DIMENSIONS 4" MIN. 8.5 FT. * 4" MIN. COVERED WITH STRAW, UNTREATED PAPER OR GEOTEXTILE FABRIC DRAIN LINE 1 FT. 1 FT. 1 FT. 1 FT. 1.5 FT. 1.5 FT. *SEE EXAMPLE BELOW. TABLE 3-1, Note 6 12 FT. ON CENTER 10.5 FT. COVERED WITH STRAW, UNTREATED PAPER OR GEOTEXTILE FABRIC 4" MIN. 4" MIN. DRAIN LINE 2 FT. 2 FT. 2 FT. 2 FT. 1.5 FT. 1.5 FT. NOT TO SCALE Page 9 of 28 REVISION A:

10 Example 2 5 FT. A.P. (ABSORPTION 24" 10 FT. ON CENTER SEE CH.8 " LEACH LINE SYS." DIMENSIONS 4" MIN. 8 FT. * 4" MIN. COVERED WITH STRAW, UNTREATED PAPER OR GEOTEXTILE FABRIC DRAIN LINE 1.5 FT. 1.5 FT. 1.5 FT. 1.5 FT. 2 FT. 2 FT. *SEE EXAMPLE BELOW. TABLE 3-1, Note 6 12 FT. ON CENTER 4" MIN. 10 FT. 4" MIN. COVERED WITH STRAW, UNTREATED PAPER OR GEOTEXTILE FABRIC DRAIN LINE 2.5 FT. 2.5 FT. 2.5 FT. 2.5 FT. 2 FT. NOT TO SCALE 2 FT. Page 10 of 28 REVISION A:

11 ATTACHMENT A PLAN CHECK LIST FOR THE REVIEW OF ON-SITE WASTEWATER TREATMENT SYSTEMS (OWTS) Plans require correction as indicated by circled items below before a permit can be issued. Return this correction sheet with corrected plans. TO FACILITATE RECHECKING PLEASE IDENTIFY NEXT TO EACH CIRCLED ITEM BELOW THE SHEET OF THE PLANS UPON WHICH CORRECTION HAS BEEN MADE. RETURN TWO (2) SETS OF CORRECTED PLANS AND ONE SET OF ORIGINAL PLAN USED FOR PLAN CHECK. 1. All plans must be drawn to scale, include property lines, structures, trees, pools, and paved areas such as driveways and walkways. Plans may be drawn on letter, legal or ledger size paper. A computerized drawing is preferred. Minimum letter height is 1/8 inch. 2. Identify location and size of the existing private sewage disposal system on plans. 3. Show number of bedrooms * in the house. 4. Show the depth below grade of the outlet of the septic tank and inlet of the seepage pit or leach lines. 5. Show sizes of all seepage pits and leach lines, and the new construction shall be in accordance with City of Rancho Cucamonga requirements. 6. For new septic systems, tanks shall be sized as follows per Table below from the current adopted California Plumbing Code. Single Family Dwelling Size of Tank # of bedrooms (gallons) 1 or , ,200 5 or 6 1,500 * Note: Dens, studies and offices are considered as bedrooms. Page 11 of 28 REVISION A:

12 In order to provide an accurate review of on-site wastewater treatment systems, the following information is to be provided on or with the plans when submitted. SEPTIC TANK (SEE CHAPTER 7, LAMP): Show manufacturer, model number, capacity and IAPMO listing number. Tanks which are not IAPMO listed must have structural calculations and construction details submitted. Show manufacturers approved installation requirements, the approved burial depths for the tank with or without grade boards, and any special devices necessary in order to attain greater burial depths. Indicate number and size of compartments in the tank. Show tanks drawn to scale and properly dimensioned from all buildings, property lines, water wells, trees, seepage pits, disposal fields, and water lines (see LAMP Chapter 8 Leach Line Systems, Chapter 9 Vertical Seepage Pit Systems, and Chapter 10 Horizontal Seepage Pit Systems) on Attachment 1. Show anticipated burial depth to the top of the tank. If extra burial depth is proposed, the number of risers and the actual and effective burial depths are to be identified on the plans. Describe manner in which the manholes will be brought to grade when installed under concrete or asphalt paving. Model numbers and sizes of extension rings, caps or access covers. Provide a note requiring the tank to be filled with water, without leakage, at the time of the first inspection. DISPOSAL FIELD OR SEEPAGE PIT (SEE CHAPTERS 8, 9 AND 10, LAMP): Show location drawn to scale including length, width, depth, and dimensions from all buildings, property lines, wells, trees (for seepage pits), adjoining seepage pits or disposal fields, water lines and distribution box. Provide cross sectional details: For disposal fields, show the depth of filter material both above and below the leach pipe the size of the leach pipe and the paper or straw cover. For seepage pits, provide an IAPMO listing number with the manufacturer's installation requirements, or, for field fabricated pits, a complete structural section and structural calculations. Show location of 100% expansion area or replacement pits, drawn to scale. Provide a clear indication that disposal fields will not be installed under concrete or asphalt paving. Provide notes regarding leach line scope (3"/100' Max.), filler material size, and preparation of the trench prior to line placement. Show a minimum 4 drop from the outlet of the Distribution Box or the Septic Tank to the disposal (leach) field or disposal (seepage) pit(s). DISTRIBUTION BOX: 1. Manufacturer, model number, IAPMO listing number and installation instructions Cross section detail depicting installation on a level concrete slab and showing the number of outlets. Drawn to scale and properly distanced from seepage pit or disposal field (see LAMP Chapter 8 Leach Line Systems, Chapter 9 Vertical Seepage Pit Systems, and Chapter 10 Horizontal Seepage Pit Systems) 4. Show a minimum 4 drop from the outlet of the Distribution Box or the Septic Tank to the disposal (leach) field or disposal (seepage) pit(s). Page 12 of 28 REVISION A:

13 GENERAL REQUIREMENTS: 1. If a percolation test/study was prepared for the project site, provide a copy of the percolation study/test for review by the Building Official, or his/her designee. See Attachment Notes regarding the requirement to post, in a conspicuous location within each dwelling unit, a septic system owner's guide, and individual as-built drawings prior to final inspection. Further, these drawings are to be submitted the Building and Safety Inspector prior to the time of final inspection on the septic system and are to be of a quality as to allow for computer scanning and subsequent imaging. 3. If a new septic system: show the general topography including contour lines of the site relative to the finish floor elevation in order to establish approximate burial depths of the leach field and septic tanks. For sites that have been graded, indicate all cut and fill areas in relation to the septic system. 4. If an existing septic system: show the depth below grade for the inlets at the depth below the inlet to the bottom of the seepage pit. ADDITIONAL CORRECTIONS: Plans examiner is available by appointment for recheck and consultation. RECHECK REQUIRED YES NO CORRECTIONS MADE AND APPROVED DATE (Except for clearances) Attachment No. 1 on the next page is provided for use by a contractor for replacement of existing OWTS. If this is a new subdivision, with plans prepared by the Civil Engineer of Record, the engineer shall prepare the plans on a minimum 24 x 36 size sheet (30 x 42 maximum) with the information required in Attachment 1 shown on the construction drawings submitted for permitting. Page 13 of 28 REVISION A:

14 Attachment No. 1 Percolation Testing The following information is excerpted from the Local Agency Management Program for On-site Wastewater Treatment Systems (LAMP OWTS) Chapters 2, Percolation Test Notification Prior to a percolation test the applicant shall notify the City of Rancho Cucamonga Building and Safety Services Department which day the percolation test and the hours of the day the percolation test will be performed. Page 14 of 28 REVISION A:

15 Percolation Test Notification Form The following form may be completed and ed to the Building Inspection Supervisor, Michael Frasure at City OWTS PMT number: (if known) Date submitted: Date of Testing: Time of Testing: Assessor s Parcel Number: Street Address: Lot Size: Slope of Lot where OWTS will be located: Disposal Field Type: Are there Streams nearby?: Are there rock outcroppings?: Provide any other criteria which may affect the installation of a standard OWTS system: Estimate Soil Type: (provide a range of hours of the testing) Other Comments: Page 15 of 28 REVISION A:

16 Percolation Testing: If a percolation test was performed by Qualified Professional (as defined in the Definitions Section of Chapter 1 of the Local Agency Management Program for On-site Wastewater Treatment Systems {LAMP OWTS}) the following information shall be provided at the time an OWTS permit is submitted for review, approval and permitting. City OWTS PMT number: Weather notes during testing: Date of Testing: Time of Testing: Assessor s Parcel Number: Street Address: Lot Size: Slope of Lot where OWTS will be located: Disposal Field Type: Are there Streams nearby?: Are there rock outcroppings?: Provide any other criteria which may affect the installation of a standard OWTS system: Estimate Soil Type: Percolation Rate minutes per inch (mpi): Percolation Rate square feet per 100 gallons: Other Comments: Page 16 of 28 REVISION A:

17 Attachment No. 2 Format for Submittal City OWTS PMT number: Date submitted: Assessor s Parcel Number: Street Address: Number of Bedrooms: Size of Septic Tank: Disposal Field Type: Is a variance from the LAMP requested? State reason for variance: Does the City support the requested variance from the LAMP? (completed by City) State Reason Other Comments: Page 17 of 28 REVISION A:

18 Include an aerial copy of the property from Google Earth on this sheet. Page 18 of 28 REVISION A:

19 Include a copy of the report from the San Bernardino County Stormwater Facility Mapping Tool ( Page 19 of 28 REVISION A:

20 Include the project site/construction drawing on this sheet: Page 20 of 28 REVISION A:

21 ATTACHMENT 3 CITY OF RANCHO CUCAMONGA PRIVATE SEWAGE DISPOSAL SYSTEM GENERAL NOTES (TO BE ATTACHED TO PLANS) A. GENERAL NOTES 1. The City only approves the plumbing design in scope and not in detail on these plans. The City does not verify construction quantities of these plans. Approval of the plans is for permit purposes only and shall not prevent the city from requiring corrections of errors in the plans. City acceptance of the plans does not relieve the applicant/contractor from responsibilities from the correction of errors and omissions discovered during construction. 2. All work shall be completed in accordance with the current adopted California Plumbing Code and all subsequent amendments. 3. At the time of the first inspection, the septic tank shall be filled with water. 4. Disposal fields shall not be constructed under driveways, asphalt pavement, walkways or other impervious services. 5. Leach lines shall be laid level. The maximum allowable slope for a leach line is 3"/100-feet. 6. The distribution box shall be set on a level concrete pad, minimum 4" thick. 7. The contractor shall provide to the homeowner a septic systems owner's guide. 8. Prior to final inspection, the contractor shall provide to the Building and Safety Services inspector an as-built set of plans. B. AS-BUILT CERTIFICATE: I hereby certify that the "record drawing" measurements as shown hereon were made under my supervision or as noted and are correct to the best of my knowledge and belief. Printed name Signature Contractor's license number Date Page 21 of 28 REVISION A:

22 OTHER NOTES TO BE COMPLETED BY APPLICANT OR CONTRACTOR 1. Septic Tank Existing Proposed Circle one Manufacturer Manufacturer Model No. Capacity Gallons IAPMO Listing No. Number of Compartments in Tank Size of each compartment 2. Seepage Pit Liner Manufacturer Manufacturer Model No. IAPMO Listing No. 3. Distribution Box Manufacturer Manufacturer Model No. IAPMO Listing No. Page 22 of 28 REVISION A:

23 ATTACHMENT 4 PURPOSE: INSPECTION OF PRIVATE SEWAGE DISPOSAL SYSTEM To provide a consistent method of inspection of private sewage disposal systems. PROCEDURE: The inspection of private sewage (septic) systems requires three visits to the site. First visit: Pre-inspection, after submittal of plans and payment of plan check fee, prior to issuance of a plumbing permit and commencement of construction activity. Second visit: When excavation is complete, the septic tank and distribution box are installed; points to be considered include the following: Septic Tank: 1. Tank is installed on dry, level, well-compacted soil. UPC Section K-10 (a) (3) 2. Inlet invert 2 above outlet invert K-5 (g) 3. Fittings properly vented with legs extending 12 below liquid level 4. Compartment fitting in place 5. Tank is coated in accordance with material used K-5 (m) 6. Located in accordance with Table K-1 (attached) and the approved plans 7. Burial depth of tank in accordance with manufacturer s design, IAPMO listing and approved plans. Deepened tanks installed in accordance with manufacturer s recommendations ie. grade boards, tank risers, strengthened caps, etc. Interior coating (per UPC K-10) K-5 (k) 8. Manholes brought to grade where under concrete or asphalt paving K-5 (l) 9. Additional manhole shall be provided over the baffle wall when first compartment exceeds 12 in length. K-5 (e) 10. Tank filled with water to flow line. Seams and joints are left exposed (except bottom) and the tank and other components determined to be watertight. K-10 (b) 1 Distribution Box 1. Set level on a concrete slab K-6 (e) 2. Inside coated with a bituminous coating K-6 (e) 3. Invert of inlet 1 minimum above outlet inverts. All outlets at the same level K-6 (e) 4. Located 5 minimum from disposal fields, beds and seepage pits. Table K-1 Page 23 of 28 REVISION A:

24 Disposal Trenches, Bed or Seepage Pit: 1. For disposal trenches or beds, grade line, or other acceptable filter material depth indicators, shall be installed with elevation of leach pipe invert indicated. Slope of leach line not to exceed 3 per 100 of run. K- 6 (i) chart. 2. Excavation properly prepared with no smeared surfaces. Soil roughened to facilitate proper percolation. I-6 (b) 3. Width and location of trenches for leach lines and diameter and depth of seepage pit in accordance with Table K-1 and approved plans. 4. In a serial distribution system, upper trench to be saturated before effluent passes to the next lower trench. The connecting down line installed on natural, undisturbed soil. K-6 (j) Third visit: Leach lines installed to previously determined gradients and ready for back filling. Disposal Trenches, Beds or Seepage Pit: 1. Filter material (stone, gravel, or slag) to be clean and varying in size from 3/4' to 2 ½. Liners or brick for seepage pit back filled with rock as required. K-6 (b) 2. Leach lines minimum 4 diameter and checked for consistent grade not exceeding 3 fall in 100 of length. K- 6 (i) Chart 3. Fittings watertight with no mitering of pipe. K-6 (f) and K-6 (g) 4. Lines covered with 2 minimum of filter material. K-6 (i) Table 5. Leach line or bed covered with untreated building paper, straw or other acceptable porous material. K-6 (b) 6. Minimum spacing between trenches shall be 4 plus 2 for each additional foot of depth in excess of 1 below the bottom of the drain line. Distribution lines in leach beds spaced not more than 6 on center nor more than 3 from edge of bed. K-6 (i) 7. Multiple lines of approximately equal length. K-6 (f) 8. Distribution boxes properly shaded prior to back filling (reference Code Interpretation-08) ANALYSIS: This procedure is intended to provide a thorough and accurate inspection of private sewage disposal systems. Any variations from that outlined above will be considered on a case-by-case basis only and must be discussed with the appropriate supervisor. Page 24 of 28 REVISION A:

25 EXCERPTS OF ORDINANCE NO. 911 The OWTS permit application shall be submitted on a form provided by the City. In accordance with the requirements of the OWTS permit application, the OWTS permit applicant must prepare and submit the following supplemental documents: (i) a percolation test, (ii) a proposed layout design, (iii) a grading plan, (iv) a building plan, (v) access to a potable water supply, (vi) and all preliminary plans required for all necessary grading and building permits. These supplemental documents shall be prepared as follows: A. Percolation Test Required. A percolation test is required when grading or other soil disturbance has occurred in the proposed OWTS location or if the applicant desires not to use the City s standard percolation rates. The applicant shall submit a percolation test report and design as performed by a registered civil engineer, registered geologist licensed by the State of California Board of Professional Engineers. All percolation testing shall be performed in accordance with Section B. Layout Design Required. With percolation test data and other data in hand, the applicant must develop and submit a Layout Design for the proposed building project and specific OWTS, for review by the City of Rancho Cucamonga Building and Safety Services Department. All OWTS layout design proposals shall demonstrate a one hundred (100%) percent reserve area for the active OWTS. The Layout Design must take percolation test data into account. In some cases, additional testing will include depth to groundwater measurements during a normal average rainfall year. In the alternative, the applicant may use the depth to ground water value used by the County of San Bernardino Stormwater Facility Mapping Tool. In some cases, the City of Rancho Cucamonga Building and Safety may conclude that a conventional or alternative OWTS cannot be safely used on the lot. Due to the potential for delays or disapproval, City of Rancho Cucamonga Building and Safety recommends that applicants submit a Layout Design and obtain an approval before incurring costs for detailed building plans and architectural fees. The approved Layout Design will state whether a field check of completed grading by the City of Rancho Cucamonga Building and Safety Services is required. The Layout Design Approval shall expire after one year from the date of issuance. 1. A layout design drawing of the proposed building construction and OWTS is required. This drawing should be prepared using standard engineer's scale on 8.5" x 11" or 11" x 17" minimum size paper. The basis for the OWTS design will be from percolation testing data and/or conditions of approval from a recorded subdivision map, parcel map, boundary adjustment, or certificate of compliance. The size of the OWTS is a function of the anticipated peak sewage flow based on the number of bedrooms, dwellings or use, and the percolation rate of the soil on the site. Page 25 of 28 REVISION A:

26 2. The layout design must include the property drawn to the following minimum scales: (i) Single Family Home or Small Commercial Properties 1 inch = 30 feet; (ii) Parcel Map, Subdivisions, Large Commercial Properties - 1 inch = 40 feet and must also show the proposed system, and 100% expansion area, including existing and potential structures, wells, streams, contours, significant vegetation (including trees), rock outcroppings, the location of all borings/tests, and the proposed house pad. 3. The proposed dwelling or development site must be located so the initial subsurface sewage disposal system (and the required 100% expansion area) functions by gravity flow, unless otherwise approved. When leach lines or pits serve a common system for two or more units, add 30% more square footage to the total absorption area, if approved by the Planning Department and Building and Safety Services Department. 4. The Layout Design shall contain the following information: (i) Site Address; (ii) Owner's Name, mailing address, and phone number; Consultant's/Contractor's name, mailing address, and phone number; (iii) Type of proposed construction residential vs. commercial); (iv) Number of existing or proposed bedrooms; (v) Purpose of project (e.g. new dwelling, new structure, guesthouse, an addition, etc.); (vi) Specify scope of work; (vii) Vicinity Map, Scale, North arrow, Thomas Bros. Map coordinates; Property Lines and lot dimensions; (viii) Percent slope and direction of fall; (ix) Proposed OWTS design detail; (x) All known, recorded easements on or within 20 feet of lot boundaries (open-space, utility, road, waterline, etc.); (xi) Source of potable water; Location of all public waterlines on or within 20 feet of property; (xii) Location of all wells on or within 200 feet of property; and (xiii) Any soils testing information, such as deep boring or percolation test, plotted on the design. 5. In preparing a layout design, the following setback requirements shall establish minimum spacing requirements from a component to the OWTS and to structures, property lines, easements, watercourses, wells, or grading: C. Grading Plan Review. Following Layout Design Review, a Grading Plan Review may be required by the Building and Safety Services Department as a condition of approval of the OWTS Layout Design. A field check may also be required upon completion of grading. D. Building Plan Review. Plans for a new or second dwellings must be submitted to the Planning Services Department for processing and approval. Upon submittal of the plans, the owner/agent shall meet with staff at the City of Rancho Cucamonga Building and Safety Services counter for a verification of bedrooms and plot plan concurrence with the approved layout. Bedrooms are used to determine the potential occupancy of a dwelling and therefore the potential amount of wastewater that will be generated. Page 26 of 28 REVISION A:

27 Guidelines for Determining the Number of Bedrooms: 1. Once the living room, dining room, family room, kitchen, bathrooms, and utility rooms have been established, all other rooms shall be considered as potential sleeping rooms. Dens, libraries, studies, weight rooms, sewing rooms, workshops, etc., shall be determined as bedrooms if they do not conform to the criteria listed below. 2. All other habitable rooms totaling at least seventy (70) square feet in size are to be considered bedrooms suitable for sleeping purposes, regardless of whether or not they contain closets or have direct access to a bathroom. 3. Rooms that open to a living room, dining room, family room, kitchen, or entry way, and have a single, un-obstructive opening (no doors) with a minimum 50% opening of the total wall space (minimum 6' wide) with archways or other acceptable means shall not be considered as bedrooms, due to the lack of personal privacy presented by the opening. 4. Rooms that can only be accessed through another bedroom are to be considered part of that bedroom, such as master suite and not an additional bedroom. 5. Any cases, which will require the relocation or modification of doorways, are to be reviewed and approved by the Planning Department and Building and Safety Services to address any structural considerations such as load bearing walls. This is to be done prior to approval or sign-off by the City of Rancho Cucamonga Building and Safety Services. E. Proof of Potable Water Supply Required. The applicant must demonstrate the proposed development s access to a potable water supply. A public water supply should be confirmed with proof of a service availability letter from the Cucamonga Valley Water District (CVWD), or a water bill showing the property is served by a local water agency. The use of any new domestic water well will require proof of potability and be subject to reviews and approvals by all agencies involved. A copy of the Well Laboratory Report that indicates the absence of bacteria and nitrate contamination of less than 10 mg/1 of Nitrate-N or 45 mg/1 of nitrate will be necessary for proof of potability of a private well. The date of the test cannot be more than one year old. If a valid test does not exist, the well must be sampled by client's consultant for bacteriological and nitrate levels. Hand-dug water wells will not be accepted as a potable water supply. F. The applicant shall submit all preliminary plans and applications to the Planning Services Department for review prior to obtaining all necessary grading and building permits. G. An OWTS installation permit will be valid for one hundred eighty (180) days, which period shall commence at the date of issuance. Upon the expiration of the initial Page 27 of 28 REVISION A:

28 one hundred eighty (180) day period, the property owner or contractor may request an extension of an additional one hundred eighty (180) day period. H. Once the OWTS installation permit has been obtained, the OWTS may be installed. The OWTS shall be inspected by the city Building and Safety Services Department before the system may be backfilled. If inspection is satisfactory, the city shall approve a final OWTS permit. Any change in the OWTS plans after the issuance of a permit must first be approved by the Director. Failure to obtain approval from the Director will invalidate the permit. I. The approval or permit cannot be transferred. Failure to obtain an OWTS permit from the Department of Building and Safety Services is a violation of this chapter. The Director may revoke a permit or approval issued pursuant to this chapter in case of any false statement, or misrepresentation of fact in the application or on the plans on which the permit or approval was based. Page 28 of 28 REVISION A: