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• No groundwater was encountered during our investigation to a depth of approximately 51 feet below <br />the ground surface. The historic high ground water is greater than 40 feet below the ground surface <br />(CDMG, 1998). Nearby groundwater wells indicate groundwater is deeper than 100-feet. Based on <br />the infiltration rates of the underlying soil, infiltration -type WQMP's are likely feasible for project <br />within the depths tested. The Project Geotechnical Consultant should review the final WQMP design <br />prior to construction. <br />• Any proposed infiltration well should be setback a minimum of 10 feet from the property line. <br />• Proposed stormwater infiltration is not anticipated to adversely impact soil structure interaction, <br />provided that the percolation area is setback a minimum of 10 feet from any building or wall <br />foundations. <br />• The infiltration facility shall be designed to overflow to the street in the event that the drainage <br />capacity is exceeded or in case of future failure to adequately infiltrate <br />• The proper use and maintenance of the drainage systems are critical to maintain the useful design life <br />per the guidelines set forth by the drain manufacturer. <br />• The subject site was reviewed from a liquefaction perspective that used groundwater at the historic <br />high of 40 feet below the ground surface. The proposed structures will be designed with this in mind. <br />The proposed stormwater infiltration will not have an adverse effect to the proposed site <br />development from a liquefaction standpoint. <br />Project i y ouncil 18 — 827 1 3 , 2021 <br />