5. The approved work plan should be followed. If unexpected conditions 

 are encountered in the field, operators should: 



a. Immediately notify the appropriate agency of the encountered 

 situation, and anticipated work deviation 



b. Proceed in a manner that closely follows this manual until the 

 permitting agency responds 



6. Gravel washing operations within the floodplain, settling pond use, 

 and washing activities should be conducted per the general recommen- 

 dations provided in Appendix F. In general: 



a. Where gravel washing operations are required, the wash water 

 should be recycled with no effluent discharge to the active 



f loodp lain 



b. If settling ponds are required, they should be designed to pro- 

 vide adequate retention time for site-specific conditions. The 

 outflow structure should be perched to avoid fish entrapment. 



c. The use of a flocculant may be necessary to meet the Federal- 

 State effluent standards 



B. SPECIFIC GUIDELINES 



Specific guidelines for site operation have been developed for rivers 

 of different configuration and size, and for different gravel deposit 

 locations in each configuration and size. The proposed site should be 

 closely matched with the following matrix Tables which direct attention 

 to specific guidelines applying to scraped, pit excavated, and dredged 

 si tes. 



'^'^ VI. SITE OPERATION 



