; (B) enhanced geothermal system monitoring wells; (C) closed loop geothermal system calibration wells; and (D) similar types of subsurface disturbances through non-production wells to assess the viability of the heat resources of the earth. (5) Secretary concerned The term Secretary concerned means— (A) the Secretary of Agriculture, with respect to National Forest System land; and (B) the Secretary, with respect to public lands. (6) Surface infrastructure The term surface infrastructure means all equipment, materials, facilities, and other items used in the drilling of a geothermal observation test project. (7) Total disturbance (A) In general The term total disturbance means a geothermal observation test project that causes not more than 10 acres of disturbance from— (i) soil or vegetation disruption at the location of each geothermal observation test project; and (ii) soil or vegetation disruption during access or egress to the geothermal observation test project site. (B) Allowance (i) Multiple projects For instances of multiple geothermal observation test projects, the acres of total disturbance allowed shall— (I) be equal to the total number of geothermal observation test projects multiplied by 10 acres; and (II) not exceed 100 total acres. (ii) Access or egress For soil or vegetation disruption during access or egress to a geothermal observation test project site, the acres of total soil or vegetation disruption allowed shall be equal to the acres of total disturbance allowed minus the acres of soil or vegetation disruption caused by the geothermal observation test project. (b) Categorical exclusion (1) In general Not later than 1 year after the date of enactment of this section, the Secretary concerned shall develop a categorical exclusion for geothermal observation test projects. (2) Administration In developing and administering the categorical exclusion under paragraph (1), the Secretary concerned shall— (A) comply with the National Environmental Policy Act of 1969 ( 42 U.S.C. 4321 et seq. )