Laserfiche WebLink
Sulfate/Corrosion Testing <br />A corrosivity test was performed on a representative sample from the site. The test was <br />performed in accordance with the CalTrans Test Methods CT-417and CT-532 (643). <br />Sulfate 1 + Minimum Resistivity <br />Location (%By Weight)(6hm.cm) ph <br />B-1 @ 0-5'0.0910 560 7.95 <br />The resistivity of the on-site soils is determined to be 560 ohm-cm. The correlation <br />between electrical resistivity and corrosivity is as follows: <br />Below 1,000 ohm-cm <br />1,000 to 2,000 ohm-cm <br />2,000 to 10,000 ohm-cm <br />Over 10,000 ohm-cm <br />Severely corrosive <br />Corrosive <br />Moderately corrosive <br />Mildly corrosive <br />The Ph values do not indicate a high acidic or alkaline environment. However, the onsite <br />soils are considered severely corrosive. The final determination on corrosivity should be <br />made by a Certified Corrosion Engineer. All applicable guidelines, codes, and ordinances <br />should be followed in the design of structure in contact with the on-site corrosive soils. <br />Sulfate resistant concrete Type 11 with a cemenUwater ratio of 0.5 and a minimum 28 days <br />strength of 4,000 psi is required during construction. <br />CONCLUSIONS <br />Based on the field exploration, our previous work in the area (References), laboratory <br />testing and engineering and geological analyses, it is GSI's opinion that the site is suitable <br />for the proposed development from a geotechnical engineering and geologic viewpoint, <br />providing that the recommendations presented herein are incorporated into design and <br />construction phases of development. <br />The primary geologic and geotechnical conditions that affect proposed site development <br />are summarized below: <br />Liquefaction Potential. <br />Engineering properties of onsite materials (expansion, sulfates, corrosion, etc.). L <br />The possibility of strong seismic shaking to occur during a seismic event on one ofthe regional faults of southern California. <br />Pacific Development Group <br />1307 West Sunflower Avenue, Santa Ana <br />File:\servenandree\4900497681.foundshopctr <br />GeoSoils, Inc. <br />W.O. 4976-Al-OC <br />November 2,2005 <br />Page 7