SECTION 252:515-7-4. Drilling plan

(a)   Drilling plan required. Prior to initiating the subsurface investigation, a drilling plan meeting the requirements of this Section shall be submitted to the DEQ for approval.

(1)   Drilling plan revisions. New hydrogeologic information collected as the investigation proceeds shall be used to revise the drilling plan and disposal facility design as necessary.

(2)   DEQ approval required. Drilling shall not begin until the drilling plan has been approved in writing by the DEQ.

(b)   Drilling plan content. The drilling plan shall include the following information at a minimum:

(1)   the name, address, and telephone number of the owner/operator, the consulting firm, and the person in charge of the project;

(2)   the following maps and drawings:

(A)   general location map, flood plain map, and quadrangle topographic map in accordance with OAC 252:515-3-52 through 54;

(B)   existing contour map in accordance with OAC 252:515-3-55, showing the locations, estimated elevations and total depths of any proposed or existing borings on the site;

(C)   site specific maps showing any wetlands, fault areas, seismic impact zones, and alluvium or terrace deposits and their recharge areas; and

(D)   drawings of proposed piezometers and/or monitoring wells to demonstrate their construction will be in accordance with the requirements of the OWRB (see OAC 252:515-7-3);

(3)   the locations of borings to be completed in accordance with the following:

(A)   borings shall be spaced on a grid, or an alternative spacing approved in advance by the DEQ;

(B)   for an area consisting of five acres or less, a minimum of four borings within the proposed permit boundary shall be completed on a new site or within the expansion area of an existing site;

(C)   for areas larger than five acres, additional borings shall be placed in accordance with Appendix D;

(D)   with prior approval of the DEQ, up to one-fourth of required borings may be replaced with existing borings located within 200 feet of the proposed boundary;

(E)   the DEQ may require more borings at sites with complex hydrogeology, such as groundwater divides, shallow saturated zones, or hydraulic barriers; and

(4)   the depths of borings to be completed as follows:

(A)   all borings shall be drilled a minimum of thirty feet below the deepest proposed placement of waste, the elevation of which shall be reported in relation to mean sea level. A borehole depth calculation shall be completed for each boring in accordance with Appendix E;

(B)   at least three borings shall be drilled two hundred feet deep or a minimum of ten feet into the uppermost saturated zone, whichever is less, in accordance with Appendix D;

(C)   at least one boring shall be drilled to a depth of 100 feet, regardless of the depth at which groundwater is encountered.

[Source: Added at 20 Ok Reg 1151, eff 6-1-03]