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~~ 2) Non-structural backfill placed around the buildings should be compacted to at least 90% of the <br />maximum standard Proctor density at or near the optimum moisttve content in order to minimize <br />furore settlement of the fill. The backfill should be placed immediately after the braced <br />foundation walls are able to structurally support the fill. Puddling or sluicing must be avoided. <br />3) The top 2 to 3 feet of soil placed within ]0 feet of the foundation should be impervious in nature <br />to minimize infilva[ion of surface water into the wall backfill. <br />4) Roof downspouts and drains should discharge well beyond the limits of all backfill. Roof <br />overhangs, which project two to three feet beyond the foundation, should be considered if gutters <br />are not used. <br />3) Landscaping, which requires excessive watering and lawn sprinkler heads, should be located a <br />minimum of 10 feet from the foundation walls of the building. <br />6) Plastic membranes should not be used to cover the ground surface adjacent to foundation walls. <br />Limitations: This report has been prepared in accordance with generally accepted soils and pavement <br />engineering practices. The recommendatOns given in this report are based on the soils and bedrock <br />encountered at this site, our understanding of the proposed conswction and the behavior of structures at <br />neighboring, similar sites. We believe that this information gives a high degree of reliability for <br />~ anticipating the behavior of the proposed structures; however, our recommendations are professional <br />opinions and cannot convol nature. nor can they assure the soils profiles beneath those or adjacent to <br />those observed. No warranties expressed or implied aze given on the content of this report. <br />Swelling soils occur on this site. These soils are stable at their natural moisture content but can shrink or <br />swell with changes in moisture. The behavior of swelling soils is not fully understood. The swell <br />potential of any particular site can change erratically both in lateral and vertical extent. Moisture changes <br />also occur erratically, resulting in conditions, which cannot always be predicted. The recommendations <br />presented in this report are based on the current state of the art for foundations and floor slabs on swelling <br />soils. The owner should be aware that there is a risk in constmction on these types of soil. Performance <br />of the buildings will depend on following the recommendations and in proper maintenance after <br />construction is complete. As water is the main cause for volume change in these soils, it is necessary that <br />[he changes in moisture content be kept to a minimum. This requires judicious irrigation and providing <br />positive surface drainage away from the building. Any disvess noted in the building should be brought to <br />the attention of a professional engineer. <br />This report is based on the investigation at the described site and on the specific anticipated construction <br />as stated herein. If either of these conditions is changed, the results would also most likely change. <br />Therefore, we strongly recommend that our firm be contacted prior to finalizing the construMion plans so <br />that we can verify that our recommendations have been properly incorporated into the building plans. <br />~~ Man-made or natural changes in the conditions of a property can also occur over a period of time. In <br />Job Number: 03.3838 NWCC, Inc. Page 7 <br />