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<br />330 Land Company, LLC 9785.004.001 <br />Arroyo Lago October 31, 2025 <br />RESPONSE TO CITY REVIEW COMMENTS Page 3 <br /> <br />The 2019 Haley & Aldrich reports for fill placement within the Busch Pit area present similar <br />language to the 2013 report. These reports contain several passed tests where the field moisture <br />content is lower than the optimum moisture content of the material being tested. Therefore, it is <br />our opinion that the fill within Busch Pit was not placed with a moisture-content specification <br />recommended by Haley & Aldrich. <br /> <br />BSK Comment 6 – Geotechnical Report, Section 3.3, Seismic Hazards <br /> <br />ENGEO should discuss the potential for densification due to earthquake shaking, which is <br />commonly known as dynamic compaction or seismic settlement of non -saturated sand. <br /> <br />ENGEO Response to Comment 6 <br /> <br />Given the fine-grained soil stratigraphy, it is our opinion that the potential for dynamic sand <br />densification at this site is low. <br /> <br />BSK Comment 7 – Geotechnical Report, Section 3.3.3, Liquefaction <br /> <br />a. ENGEO should present the results of their liquefaction of the borings in an appendix to the <br />geotechnical report. <br />b. ENGEO should also perform liquefaction analysis based on 1-CPT-1 through 1-CPT-5 and <br />update their discussion of liquefaction assessment as appropriate. The results of the CPT <br />analysis should also be presented in an appendix to the geotechnical report. <br /> <br />ENGEO Response to Comment 7 <br /> <br />As discussed in Section 3.3.3, based on the soil type and the depth to hydrostatic groundwater, <br />the material is not susceptible to liquefaction triggering. The boring analysis was performed to <br />corroborate these findings. <br /> <br />BSK Comment 8 – Geotechnical Report, Section 3.4, Compressible Soil <br /> <br />This section references a different fill amount and a different set of civil plans than Section 1.3, <br />Project Description, of the geotechnical report. This section and Section 1.3 should be revised to <br />provide consistent information and to reference the Vesting Tentative Map dated July 2025 if <br />appropriate. <br /> <br />ENGEO Response to Comment 8 <br /> <br />No exceptions taken. The geotechnical report has been revised accordingly. <br /> <br />BSK Comment 9 – Geotechnical Report, Section 3.5, Differential Fill <br /> <br />ENGEO should also include discussion about the emergency swale because it is as deep as <br />5 feet bgs in some areas and will therefore result in differential fill depths across some residential <br />lots. <br /> <br />