4518 SEAHURST AVE Geotech Report 2022-10-25

Naranjo May 18,2015 JN 15186 • ge We did not observe indications of instability of the slopes within the site, not did we observe surface water within the site. SUBSURFACE The subsurface conditions were explored by excavating four test pits at the approximate locations shown on the Site Exploration Plan, Plate 2. Our exploration program was based on the proposed construction, anticipated subsurface conditions and those encountered during exploration, and the scope of work outlined in our proposal. The test pits were excavated on May 1, 2015 with a rubber-tracked excavator. A geotechnical engineer from our staff observed the excavation process, logged the test pits, and obtained representative samples of the soil encountered. "Grab" samples of selected subsurface soil were collected from the backhoe bucket. The Test Pit Logs are attached to this report as Plates 3 and 4. Soil Conditions Test Pits 1 and 2 were located near the northeast and southeast corners of the proposed residence. These explorations found fill and buried topsoil that extended to depths of about 4 feet and were underlain by sand with varying amounts of gravel. The sand was loose to medium-dense at a depth of 4 feet and became medium-dense 5 to 6 feet below the ground surface. The medium-dense sand continued to base of the test pits at depths of 7 and 7.5 feet. Test Pits 3 and 4 were located near the northwest and southwest corners of the proposed residence. They revealed about 2 feet of topsoil overlying sand with varying amounts of gravel that was loose to medium-dense and then became medium-dense at a depth of 3 feet. The medium-dense sand extended to the maximum explored depths of 7 and 7.5 feet. Groundwater Conditions No groundwater seepage was observed in the test pits, which were left open for only a short time period. It should be noted that groundwater levels vary seasonally with rainfall and other factors. The stratification lines on the logs represent the approximate boundaries between soil types at the exploration locations. The actual transition between soil types may be gradual, and subsurface conditions can vary between exploration locations. The logs provide specific subsurface information only at the locations tested. The relative densities and moisture descriptions indicated on the test pit logs are interpretive descriptions based on the conditions observed during excavation. The compaction of test pit backfill was not in the scope of our services. Loose soil will therefore be found in the area of the test pits. If this presents a problem, the backfill will need to be removed and replaced with structural fill during construction. GEOTECH CONSULTANTS,INC.