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625 Cypress Avenue Geotechnical Investigation Project No. W1895-88-01 - 16 - April 23, 2024 7.1.11 Excavations up to 7 feet in vertical height may be required for the construction of new foundations for proposed improvements. Performing open excavations adjacent to or deeper than the existing foundation system could potentially remove lateral support and/or undermine the existing foundation. Excavation for construction of new foundations immediately adjacent to existing foundations may require special excavation measures in order to maintain lateral support of the existing adjacent foundation. Recommendations for Temporary Excavations are provided in Section 7.10. 7.1.12 Based on the results of the percolation testing, a stormwater infiltration system is considered feasible for this project. Recommendations for infiltration are provided in the Stormwater Infiltration section of this report (see Section 7.12). 7.1.13 Once the design and foundation loading configuration for the proposed structure proceeds to a more finalized plan, the recommendations within this report should be reviewed and revised, if necessary. Based on the final foundation loading configurations, the potential for settlement should be re-evaluated by this office. 7.1.14 Any changes in the design, location or elevation, as outlined in this report, should be reviewed by this office. Geocon should be contacted to determine the necessity for review and possible revision of this report. 7.1.15 The most recent ASTM standards apply to this project and must be utilized, even if older ASTM standards are indicated in this report. 7.2 Soil and Excavation Characteristics 7.2.1 The in-situ soils can be excavated with moderate effort using conventional excavation equipment. Some caving should be anticipated in unshored excavations, especially where granular soils are encountered. 7.2.2 It is the responsibility of the contractor to ensure that all excavations and trenches are properly shored and maintained in accordance with applicable OSHA rules and regulations to maintain safety and maintain the stability of existing adjacent improvements. 7.2.3 All onsite excavations must be conducted in such a manner that potential surcharges from existing structures, construction equipment, and vehicle loads are resisted. The surcharge area may be defined by a 1:1 projection down and away from the bottom of an existing foundation or vehicle load. Penetrations below this 1:1 projection will require special