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' r For SB-5, it is intended to route the runoff from the shop area into a detention pond as shown on the final plans. This pond would also act as an oil/grease separation pond. It is intended to route _ the discharge from this pond into the natural drainage course that is located within SB-5. As Phase IV is constructed, it is intended to route the flows from the retention pond into the final pond ' system for Phase IV. At this time, the retention pond may be reduced in size, yet it would still function as an oil/grease ' separation device. ' - It is felt that the proper design and construction of these ponds would allow for the containment of oil and grease materials and would retain the necessary stormwater. Presented in the grading ' and drainage plans are the ditches and ponds for Phase I. ' VI. PROJECT PHASING As previously stated, this project contains phasing of the gravel extraction dependent upon the developer's needs. This drainage analysis has presented all of the subbasins that have an impact on ' - the project as a whole. At this time, only subbasins SB-2, 4, and 5 appear to have an effect upon the development planned for Phase I. SB-3 has a minimal impact since the flows that enter the pond are routed to the Los Pinos River. Development within SB-7 would result in an increase of the pond wise and areas that are left _ ' undisturbed would continue to flow towards the river. SB-1 and SB-6 development would result in additional ponds and surrounding bank ' ~ areas that would allow flaws to continue towards the river. Development of SB-5 consists of a shop area that was considered as a portion of this analysis, plus gravel extraction and a resultant pond. ^ It is intended to complete detailed grading and drainage plans for _ Phases II (optional), III and IV at a time prior to beginning ' gravel extraction activities within these phases. 1 ' -3-