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Geotechnical Engineering and Geological Hazard Study Lincoln Elementary School Modernization Project Manteca, California Page 1 c^3pgseFPdiX C contains ulc results of t1Pe LUPiosi'Yity tests p lion Led, as well as a brief evaluation letter by our laboratory subcontractor. The brief evaluation provides general recommendations regarding protecting buried metals. The results indicate that the sulfate ion concentration is insufficient to cause damage to reinforced concrete and coated steel. If warranted, a corrosion expert should be consulted to develop specific recommendations. 12.0 PERCOLATION TESTING Percolation testing was not performed for inclusion into this report. If percolation testing and rates are required for design, then the tests will be performed at a later date and reported separately. 13.0 ADDITIONAL SERVICES The geotechnical recommendations and design criteria given in this report are sensitive to the location, design details, and any special requirements of the new construction. Condor should review the geotechnical elements of project grading, foundation plans and specifications prior to construction bidding to check that the intent of our recommendations has been incorporated into these project documents. If Condor does not review the geotechnical elements of the plans and specifications, the reviewing geotechnical engineer should thoroughly review this report and concur with its conclusions and recommendations or provide alternative recommendations. Because surface conditions vary across the site, geotechnical recommendations used as a basis for construction contracting are sensitive to the possible need for adjustment in the field. The adjustments are dependent upon conditions revealed during construction that could previously only be assumed based upon site exploration. Since the intent of the recommendations given in this report are best understood by a Condor representative, we recommend that field observations and testing during earthwork and construction be performed by Condor. If Condor does not provide the field observations and testing, the geotechnical engineer of record should thoroughly review this report and concur with its conclusions and recommendations or provide alternative recommendations. The geotechnical engineer or qualified representative should be on-site to observe and advise during site preparation, grading and earthwork, paving, and construction of foundations and slabs -on -grade. These observations should be supplemented with periodic density and compaction testing of subgrade and engineered fills to evaluate conformance with the recommendations contained in this report. It is important that foundation excavations be checked after cleaning and immediately prior to concrete placement to verify their suitability. 14.0 LIMITATIONS The geotechnical conclusions and recommendations presented in this report are intended for planning, design, and construction of the new Lincoln Elementary School as described in this report. These conclusions and recommendations may be invalid if. • the design assumptions change; • the report is used for another site or project; • the encountered soil or groundwater conditions are different than those anticipated in this report; • the recommendations contained in this report are not followed; or • any other change is implemented that materially alters the project. This report was prepared in accordance with the generally accepted standards of geotechnical engineering practice existing in San Joaquin County at the time it was written. No other warranty, expressed or implied, is W