(1) Requested services are provided at the applicable hourly rate except as provided in subsection (5) of this section. The hourly rate for nonbusiness hours applies for service provided before 8:00 a.m. or after 5:00 p.m. during the workday and for all services provided on Saturday, Sunday, or on a holiday listed in subsection (2) of this section.

(2) Holidays shall mean New Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day, the day immediately following Thanksgiving Day, Veteran's Day, Christmas Day, President's Day, and Martin Luther King's Birthday.

(3) Charges are assessed in one-half hour increments.

(4) Persons requesting service with less than twenty-four hours notice during nonbusiness hours, may be subject to a charge of two additional hours at the nonbusiness hourly rate if the department is required to pay call back pay to the employee(s) providing the requested service.

(5) The department reserves the right to provide service by written agreement at a single, negotiated cost or at a negotiated rate for projects with one of the following characteristics:

(a) Projects requiring multiple periodic inspections and/or certificates; or

(b) Projects requiring field inspections of crops not regulated under chapter 15.13 or 15.14 RCW.

The rate charged shall not be less than the cost to the department of providing the services.