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330 Land Company, LLC Arroyo Lago <br />9785.004.001 Design-Level Geotechnical Report <br /> <br /> <br /> Page | 15 April 16, 2024 <br />Latest Revision October 31, 2025 <br />Excavations resulting from demolition and stripping which extend below final grades, should be <br />cleaned to firm undisturbed soil, as determined by our representative. Once the surface of areas <br />to be graded are prepared as discussed above, the surface should then be scarified, moisture <br />conditioned, and backfilled with suitable material compacted to the recommendations presented <br />in Section 5.6. <br /> <br />5.2 SURCHARGE PROGRAM <br /> <br />To minimize post-construction total and differential settlements to allow for shallow foundations, <br />we recommend performing a surcharge program over the site, excluding Busch Pit. Tables <br />5.2-1 and 5.2-2 below presents our estimated surcharge heights per planned civil fill, considering <br />the location of residential lots relative to the former fill stockpile area and different time horizons <br />of surcharge placement. The estimated surcharge heights consider a surcharge fill mass (unit <br />weight of 120 pcf) of approximately 120 percent of the anticipated service loads of the project. <br /> <br />TABLE 5.2-1: Estimated Surcharge Height (Case 1: Residential Lots Not within Former Fill Stockpile <br />Area) <br />CIVIL FILL <br />(feet) <br />SURCHARGE HEIGHT ABOVE PROPOSED CIVIL FILL (feet) <br />4 MONTHS 6 TO 9 MONTHS 12 MONTHS <br />0 6 4½ 3½ <br />1 6 5 4½ <br />2 7 6 5½ <br />3 8½ 7½ 7 <br />4 9½ 8½ 8 <br />5 10½ 9½ 9 <br />6 12 11 10 <br />7 13 12 11 <br />8 14½ 13½ 12½ <br /> <br />TABLE 5.2-2: Estimated Surcharge Height (Case 2: Residential Lots within Former Fill Stockpile Area) <br />ADDITIONAL CIVIL FILL <br />(feet) <br />SURCHARGE HEIGHT ABOVE PROPOSED CIVIL FILL (feet) <br />4 MONTHS 6 TO 9 MONTHS 12 MONTHS <br />0 1½ 0 0 <br />1 3 1½ 0 <br />2 4½ 2½ 0 <br />3 6 4 1 <br />4 7½ 5 2 <br />5 9 6 3½ <br />6 10½ 7½ 4½ <br />7 12 8½ 5½ <br />8 13½ 10 7 <br /> <br />Lots entirely within the former fill stockpile area, as shown in Figure 2, may use Table 5.2-2 to <br />determine surcharge heights; otherwise, Table 5.2-1 should be used to determine surcharge <br />heights. Surcharge heights should be selected based on the average height of civil fill placed <br />within structural areas, rounded up. Surcharge heights should be stepped, non-structural <br />improvements for Cases 1 and 2 (such as streets and parks) and should be surcharged with a <br />minimum height of 4 feet.