Exhibit 10.6 Summary Description of Equistar Chemicals, LP Executive Supplemental Savings Plan (ESSP) Eligibility: Employees who earn in excess of $160m annually Eligible employees receive an "employer match" on the monies that are limited in the 401(k) plan due to the plan's exclusion of a company match on employees who earn $160m annually in base pay. The employer "match" may be taken in cash at year-end, or deferred in the Salary and Bonus Deferral Plan.