Code 9402 applies to specialist contractors or municipal employees engaged in street cleaning.  The cleaning may be performed by either manual means or mechanical means such as the use of mechanical sweepers.  Some sweepers direct a spray onto the street surfaces and rotary brooms sweep dirt and other debris in storage bins.  Filled bins are then disposed of at commercial dumps.  Streets may also be cleaned by water sprinkling trucks.  The clearing of snow from public or private parking lots, streets or roads is assignable to this classification.  This classification also includes employees of toll roads who have been hired specifically to perform snow removal operations.  Cleaning of oil and gas spills is inclusive under this classification.  This classification is also applicable to specialist contractors or municipal employees engaged in cleaning mainline sewers and storm sewers where material and other refuse from the street is likely to accumulate. 

Specialists engaged in cleaning cesspools or septic tanks utilizing vacuum pump trucks as well as specialists who rent, deliver, install and service portable toilets are also assignable to this classification.