the principles of the present invention and their advantages are best understood by referring to the illustrated embodiment depicted in fig1 - 3a of the drawings , in which like numbers designate like parts . fig1 a and 1b illustrate a wash - out system 100 according to the principles of the present invention . advantageously , wash - out system allows for the chute of a concrete truck or the nozzle of a concrete pump to be rinsed out and the resulting waste - water mixture to be captured . the solids are then removed from the mixture and the water filtered and recycled for use in subsequent rinse out operation . advantageously , the waste - waste mixture is never in contact with the ground , thereby minimizing environmental contamination . furthermore , wash - out system 100 can easily be moved from jobsite to jobsite , thereby eliminating the need to dig environmentally hazardous wash - out pits . the illustrated embodiment of wash - out system 100 shown in fig1 a and 1b includes three stations supporting the wash - out of three corresponding concrete trucks , such as the exemplary ready - mix concrete truck as shown in fig1 a . ( while a ready - mix concrete truck is shown for purposes of discussion , the principles of the present invention are equally applicable to other types of concrete pouring equipment , such as concrete pumps .) alternate embodiments of wash - out system 100 may have a smaller or greater number of wash - away stations , depending on the number of pieces concrete pouring equipment the user wishes to support at one time . in the illustrated embodiment , wash - out system 100 includes a base portion 101 , including three receptacles 102 a - 102 c for receiving a corresponding bin 104 a - 104 c . as discussed further below , wash - out system 100 includes a filter system 103 , which filters particulate matter from the contaminated liquids that drain from each bin 104 a - 104 c being used for wash - out . each bin 104 a - 104 c , which are discussed below in detail in conjunction with fig2 , can be removed from corresponding receptacles 102 a - 102 c , such that waste materials captured within bins 104 a - 104 c can be hauled away and , for example , crushed and recycled as road base . after filtering through filter system 103 , the filtered water is stored in a clean water tank 301 , discussed in detail below in conjunction with fig3 a and 3b , and recycled for use in washing - out concrete pouring equipment . preferably , base 101 , filter system 103 , and bins 104 a - 104 c are constructed from steel plate , although alternate materials that will sustain the wear and tear typically found at a jobsite are equally acceptable . fig2 a is a cutaway view of the selected one of bins 104 a - 104 c shown in fig1 b . bins 104 a - 104 b include a steel frame 201 and sidewalls 203 , which define a receptacle 202 for receiving mixture of water , rock , concrete , sand , and similar waste materials washed from the cement pouring equipment . receptacles 204 provide for receiving a forklift fork or similar device for inserting and removing bins 104 a - 104 c from the corresponding receptacles 102 a - 102 c in base 101 . each bin 104 a - 104 c also includes a hinged bottom 205 , which allows accumulated material ( e . g . rock , concrete and sand ) to be dumped for recovery . additionally , each bin 104 a - 104 c includes a flexible portion 206 , made of rubber or a similar material , upon which a concrete truck chute or concrete pump nozzle rests during wash - out . sidewalls 203 are fastened to frame 201 at various points , however , spaces or gaps are provided along the edges 207 where the sidewalls meet , such that water can seep out during the wash out process , while larger particulate matter remains within receptacle 202 . similarly , when hinged bottom 205 is in the closed position , spaces or gaps around its periphery similarly allow water and small particulate matter to seep out of bin 104 a - 104 c , while larger particulate matter is retained . fig3 a is a front cross - sectional view of base 101 and filter 103 . fig3 b provides a corresponding cross - sectional and view . in particular , filter system 103 includes a set of baffles 303 a - 304 f , which define a set of separation tanks 304 a - 304 f . water with particulate matter enters at first settlement tank 304 a through pipe 107 and exits separation tank 304 f through pipes 302 a and 302 b during the filtering operations described below . each settlement tank 304 a - 304 f is used to collect particulate matter 305 , such as sand and concrete . additional filters 306 a - 306 e , for example broom filters or sponges , remove particles from the water - waste mixture cascading over baffles 303 a - 303 e . filter system 103 is bolted or fastened to base 101 and can therefore be removed for cleaning through cover 309 . the internal floors 307 of base 101 slope to a sump area 308 . base portion 101 also houses a clean water pump 309 , for pumping water through a hose to a user , and a sump pump 310 , each of which is respectively accessible through a removable cover 311 a - 311 b . ( while one clean water hose is shown in fig1 a as an example , clean water pump 309 can support multiple hoses for simultaneous wash - out of multiple pieces of concrete pouring equipment .) wheels 312 allow wash - out system 100 to be easily moved around the jobsite . during wash - out , for example wash - out of the chute of a ready - mix concrete truck , a worker rinses the chute , as shown in fig1 a , using clean water pumped from clean water tank 301 by clean water pump 309 . the resulting mixture of water and waste concrete products are swept into the corresponding bin 104 a - 104 c . the larger particulate matter , such as large pieces of concrete and rock , are retained within the given bin 104 a - 104 c . the water and smaller particulate matter drains through the gaps along the edges of the bin sidewalls and bottom and into the corresponding receptacle 102 a - 102 c . water and particulate matter draining into the corresponding receptacle 102 a - 102 c flows down the sloped inner floors 307 of base 101 to sump 308 . the water and small particulate matter accumulating in sump 308 are pumped by sump pump 310 through pipe 107 into first settlement tank 304 a . at least some of the particulate matter 305 settles out to the bottom as settlement tank 304 a fills . as the water and remaining particulate matter reach the top of settlement tank 304 a , they cascade through filter 306 a and into second settlement tank 304 b , which begins to fill as additional particulate matter 305 settles to the bottom . this process continues with the progressively cleaner water - waste mixture cascading through settlement tanks 304 c - f and corresponding filters 306 c - 306 e . at end settlement tank 304 f , the remaining clean water flows through pipes 302 a and 302 b into underlying clean water tank 301 , where it is available for recycling . advantageously , wash - out system 100 not only protects the environment from exposure to polluted waste water , it also allows significant amounts of water to be recycled . moreover , removable bins 104 a - 104 c allow the user to quickly and easily remove extracted waste concrete materials for recycling , for example as road bed . furthermore , wash - out system 100 is scalable and therefore can be adapted to include as few as one wash - out station to five or more wash - out stations . additionally , wash - out system 100 is easily transportable , inexpensive to maintain on the jobsite , and relatively easy to construct . although the invention has been described with reference to specific embodiments , these descriptions are not meant to be construed in a limiting sense . various modifications of the disclosed embodiments , as well as alternative embodiments of the invention , will become apparent to persons skilled in the art upon reference to the description of the invention . it should be appreciated by those skilled in the art that the conception and the specific embodiment disclosed might be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present invention . it should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the invention as set forth in the appended claims . it is therefore contemplated that the claims will cover any such modifications or embodiments that fall within the true scope of the invention .