Mobile household hazardous waste collection facilities are housed in portable structures that are operated for no more than three weeks in a row during any two-month period for not more than four times a year in the same location. At the end of operations at each site, all equipment and wastes must be removed from the site within 144 hours. Since regulations authorizing mobile HHW facilities have not yet been promulgated, authorization for mobile facilities is currently provided under a hazardous waste variance issued by DTSC. In general, in order to receive a variance to operate a mobile HHW collection facility the local agency will be required to operate under the same standards as the temporary facility (Title 22, CCR section 67450.4)