*Todd Walker, by signing his name hereto, does hereby sign this Registration
Statement on Form S-8 on behalf of Valero L.P. and each of the above-named
officers and directors of Valero GP, LLC, general partner of Riverwalk
Logistics, L.P., general partner of Valero L.P., pursuant to powers of attorney
executed on behalf of the Company and each of such officers and directors.
By: /s/ Todd Walker