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J. H. KLFINFELDER & ASSOCIATES <br /> File No. S-2568-4 <br /> October 11, 1983 <br /> Page 7 <br /> including sealing of cracks, and other measures. <br /> 6. All curbs surrounding landscape areas, should be <br /> embedded at least 8 inches below subgrade to <br /> minimize the movement of moisture beneath pave- <br /> ments. <br /> Storm Water Disposal <br /> It is currently planned to store and dispose of on-site storm water on the lots. <br /> This water is planned to be stored and percolated from shallow ponds, 18 inches deep. <br /> The results of the exploratory boring and laboratory testing indicates the soils <br /> below the site are relatively fine-grained. The field percolation test results are shown <br /> on Table II. The average field percolation test result is 63 minutes per inch. <br /> Based on this information and experience for such disposal systems, we anticipate <br /> storm water will percolate at a rate of 1 to 4 inches per day. A percolation rate of <br /> 2 inches per day should be used for design. The variation in this rate will be a <br /> factor of moisture content of soil below ponds, surface condition at bottom of ponds, <br /> and pond depth. <br /> In order to achieve these percolation rates, we suggest depths not exceed 5 feet <br /> below the existing site grade. <br /> ADDITIONAL SERVICES <br /> This report completes our present scope of work on this project. As the design is <br /> finalized and specifications and working drawings are prepared, your office may consult <br /> with us on unanticipated problems or questions. Upon request, our firm can provide <br /> guide specifications for items pertaining to our report. We recommend that a review <br /> copy of the grading plans and specifications be provided to our firm prior to issuance <br />