SECTION 252:626-3-6. Engineering report

(a)   Copies and timing. Submit 3 copies of an approvable engineering report as required in OAC 252:626-3-2 for proposed new construction or modifications to PWS systems, at least 30 days prior to the submission of the application for a permit to construct.

(b)   Purpose. The purpose of the report is to present the Engineer's findings with enough attention given to detail(s) to allow adequate review of the project by the owner and applicable regulatory agencies.

(c)   Requirements. The report must include all information necessary for a comprehensive evaluation of the proposed construction. The report must present, at a minimum, the following:

(1)   General information. Include the following:

(A)   a description of existing water works and wastewater facilities,

(B)   identification of the municipality or area served,

(C)   name and mailing addresses of the owner and official custodian,

(D)   a statement as to whether the project will be constructed in phases. If the project is to be constructed in phases, the statement will include the number of phases necessary to complete the project and which portions of the project will be completed in each phase,

(E)   a demonstration that adequate capacity, treatment and compliance with the primary drinking water standards are maintained during construction,

(F)   a letter from the permittee approving the contents contained in the engineering report as submitted,

(G)   a map showing legal and natural boundaries of entire service area, and

(H)   a map showing new service areas or annexed areas.

(2)   Extent of water works system. Include the following:

(A)   a description of the area to be served,

(B)   provisions for extending the waterworks system,

(C)   establish the anticipated design average and peak flows for existing and potential industrial, commercial, institutional and other water supply needs for both the current service area and potential future service areas,

(D)   a hydraulic analysis that demonstrates that a minimum of 25 psi shall be met at all times throughout the distribution system, and

(E)   a site plan and schematic layout of treatment facilities.

(3)   Alternate plan. Where feasible and practical, provide a minimum of 3 alternative solutions and discuss the alternatives, including cost estimates and reasons for selecting the one recommended.

(4)   Soil, ground water conditions, and foundation problems. The report must include a description of the following:

(A)   the character of the soil where water mains are to be laid,

(B)   soil conditions, which might affect foundations of proposed structures, and

(C)   the approximate elevation of ground water in relation to subsurface structures.

(5)   Water use data. Provide the following water use data:

(A)   a description of the population trends as indicated by available records, and the estimated population which will be served by the proposed water supply system or expanded system,

(B)   present water consumption of existing systems and the projected average and maximum daily demands that were used as the basis of the design, and

(C)   present or estimated yield of supply source(s) along with a copy of the water rights verification form and/or the purchase water contract.

(6)   Fire flow requirements. Demonstrate that the plans meet the requirements regarding fire flows pursuant to the International Fire Code, published by the International Code Council, Inc., 2003 Edition, Distribution System Requirements for Fire Protection, M 31, published by the AWWA, 3^rd Edition or other recommendations of similar organizations for the fire service area

(7)   Sewer system available. Describe the methods of disposal for sanitary and all other wastewater from the treatment plant.

(8)   Sources of water supply. For the alternative chosen, the report must describe the proposed source or sources of water supply to be developed, the reasons for their selection, and provide information required by OAC 252:626-7 and the following:

(A)   surface water sources, including:

(i)   hydrological data, stream flow and weather records,

(ii)   safe yield, including all factors that may affect it,

(iii)   maximum flood or pool elevation,

(iv)   description of watershed, noting any existing or potential sources of contamination which may affect water quality, and

(v)   quality of the raw water with special reference to fluctuations.

(B)   ground water sources, including:

(i)   sites considered,

(ii)   advantages of the site selected,

(iii)   elevations with respect to surroundings,

(iv)   character of formations through which the source is to be developed,

(v)   geologic conditions affecting the site,

(vi)   summary of exploration; test well depth and method of construction; placement of liners or screen; test pumping rates and duration; water levels and specific capacity; chemical and radiological quality of the water,

(vii)   sources of possible contamination including but not limited to wastewater collection and treatment facilities, landfills, outcroppings of consolidated water-bearing formations, waste disposal wells, slush pits, irrigation wells and abandoned wells, and

(viii)   industrial and other private water supply. Where pertinent, use significant ground water developments within a 1 mile radius of the proposed ground water source, giving depths, size, protective casing depth, capacity, location, type and any available information pertaining thereto.

(9)   Proposed treatment processes. Summarize and determine the adequacy of proposed processes and unit parameters for the treatment of the water under consideration. Pilot studies may be required for innovative design. Post treatment for membrane systems shall be in accordance with OAC 252:626-9-9 (f)(6).

(10)   Residuals management. Submit a Residuals Management Plan that discusses the wastes and volume generated by existing and proposed water treatment processes, their volume, proposed treatment of waste products, points of discharge or method of disposal or land application.

(11)   Project sites. Address the following in the report:

(A)   discussion of various sites considered and advantages of those recommended,

(B)   the proximity of residences, industries, and other establishments, and

(C)   any potential sources of pollution that may influence the quality of the supply or interfere with effective operation of the water works system, including but not limited to, absorption systems, septic tanks, privies, sink holes, sanitary landfills, refuse and garbage dumps.

(12)   Cost estimates. Address the following in the report:

(A)   estimated cost of integral parts of the system,

(B)   detailed estimated annual cost of operation, and

(C)   proposed methods to finance both capital charges and operating expenses.

(13)   Future extensions. Summarize future needs and services.

[Source: Added at 18 Ok Reg 1612, eff 6-1-01; Amended at 25 Ok Reg 2304, eff 7-11-08; Amended at 31 Ok Reg 1301, eff 9-12-14; Amended at 33 Ok Reg 1472, eff 9-15-16]