D.C. Mun. Regs. tit. 8-B, § 1232
1232.1 Payment of compensation to a faculty member for full-time teaching during the summer term shall be at the rate of twenty percent (20%) of the employee's regular compensation for the two (2) semester academic year.
1232.2 The salary for summer school teaching shall be proportionately adjusted for a period of time less than the full semester of fifteen (15) weeks or for less than a full teaching load.