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<br /> SCE Santa Ana <br /> October 25,2019 <br />Project No. 3.31634 <br /> Page 16 <br /> <br /> <br />Based on the test results, onsite soils are not considered corrosive to bare metals and <br />concrete. Soils are considered corrosive if the sulfate concentration is 2,000 ppm or <br />greater, the chloride concentration is 500 ppm or greater, or if the pH is 5.5 or less <br />(Caltrans Corrosion Guidelines 2003). However, the recorded electrical resistivity value <br />was 4288 ohm-cm indicates soils are corrosive to metals in contact. Cathodic protection or <br />use of galvanized pipes and coated steel should be used. Consultation with a corrosion <br />engineer is recommended. <br /> <br />18. QUALITY CONTROL <br /> <br />The recommendations in this report are based on limited subsurface information. The <br />nature and extent of variation across the site may not become evident until construction. <br />If variations are exposed during construction, it may be necessary to re-evaluate our <br />recommendations. The recommendations presented herein are based on the assumption <br />that sufficient field testing and construction review will be provided during all phases of <br />construction. We should review the final plans and specifications to check for conformance <br />with the intent of our recommendations. <br /> <br />19. DRAINAGE <br /> <br />Positive site drainage should direct runoff away from foundations and pavement areas; <br />Site drainage should be directed to an approved drainage facility. Positive drainage may <br />be accomplished by providing drainage away from buildings at a gradient of at least 5- <br />percent for earthen surfaces for a distance of at least 10-feet away from the face of wall. If <br />a distance of 10-feet cannot be achieved, an alternative of a gradient of at least 5-percent <br />to an area drain or swale having a gradient of 2-percent is acceptable. <br /> <br />20. GEOTECHNICAL OBSERVATION AND TESTING DURING CONSTRUCTION <br /> <br />The recommendations provided in this report are based on limited subsurface <br />observations and geotechnical analysis. The interpolated subsurface conditions should be <br />checked in the field during construction by SGSI. Geotechnical observation and testing is <br />required per the California Building Code (CBC). Geotechnical observation and/or testing <br />should be performed by SGSI at the following stages: <br /> <br /> During grading (removal bottoms, fill placement, etc); <br /> <br /> During utility trench and retaining wall backfill and compaction; <br />61 of 100 <br />1327 S Grand Ave <br />12/12/2024