  The water at the proposed site of the CHIPS water Cherenkov detector has been
studied to measure its attenuation length for Cherenkov light as a function of
filtering time. A scaled model of the CHIPS detector filled with water from the
Wentworth 2W pit, proposed site of the CHIPS deployment, in conjunction with a
3.2\unit{m} vertical column filled with this water, was used to study the
transmission of 405nm laser light. Results consistent with attenuation lengths
of up to 100m were observed for this wavelength with filtration and UV
sterilization alone.
