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Mr. Michael Toelle <br />Holcim US, Inc. <br />January 31, 2024 <br />Page 3 <br />Holcim RCQ Letter Report 20240131 <br /> <br /> Figure 1. Drainage Basins <br />Based on the proposed reclamation pit configurations, stormwater will accumulate in <br />four areas of the Site identified as the backfilled pit and Pits 1 through 3. For the pur- <br />poses of the hydrologic analysis and infiltration calculations, the backfilled pit surface <br />and exposed pit bottoms were assumed to be completely level as indicated by the <br />closed contours on the proposed reclamation configuration. Pit 3 was divided into two <br />subsections (Pit 3a and Pit 3b) due to the reclamation configuration, which could poten- <br />tially split the flow. Furthermore, the backfilled pit surface was assumed to have a con- <br />tainment berm along the east side to prevent runoff and retain stormwater on the back- <br />fill surface. Table 1 shows the contributing drainage basin areas and runoff volumes to <br />each area. <br /> <br />Pit 1 <br />Backfilled <br />Pit <br />Pit 2 Pit 3a <br />Pit 3b