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0 <br /> k4KLEIN .FELDER <br /> „,.. .„.,,,.,,,r <br /> Tile No. 20-1096-15 <br /> May 13, 1999 <br /> Mr.Barry Ruhl <br /> A. G. Spars Land Company <br /> 1341 West Robinhood <br /> Stockton, California 95207 <br /> Subject: SUMMARY OF PERCOLATION TESTS AND <br /> NITRATE LOADING CALCULATIONS <br /> CLUBHOUSE DISPOSAL AREA <br /> THE RESERVES AT SPANOS PARK <br /> SAN JOAQUIN COUNTY, CALIFORNIA <br /> Dear Mr. Ruhl: <br /> Presented in this letter are the results of percolation tests performed by our firm, as well as nitrate <br /> loading calculations for the clubhouse disposal area at the Reserves project at Spanos Park. <br /> Reference is made to our letter dated December 4, 1998, which summarizes preliminary percolation <br /> testing and chemical analysis of groundwater. As described in this previous letter we recommended <br /> that the proposed disposal area be ripped to loosen the near-surface silt and clay [materials and that <br /> additional fill be placed to raise grade to provide a 5-foot separation between the bottom of the leach <br /> ! field and the groundwater table. <br /> Preparation of a test area was completed in early April of this year. We understand that equipment <br /> ripped to at least the 24-inch depthinboth directions and approximately 2-1/2 foot of fill was <br /> placed. The entire area was then flooded. On April 20, 1999, as the ground surface dried and <br /> "crusted" over, we set up and ran two percolation tests. Unfortunately, it appeared that the native <br /> soils were still moist when the ripping occurred and instead of loosening the ground some <br /> compaction appears to have occurred. The results of the percolation tests were approximately 60 <br /> minutes per inch or less. It was evident that additional drying would be needed before ripping was <br /> effective in the remainder of the leach Feld area. However, natural drying would have required a <br /> ! considerable length of time,, therefore the contractor removed approximately 2 feet of the native <br /> material, spread the material out to dry and returned it to the site. This processed native material <br /> was capped with an approximate 6-inch blanket of silty fine to medium sand. Reference is made to <br /> our fax submittal dated April 28, 1999, describing this condition as well as gradation tests for the <br /> silty sand blanket and the soil mixture placed above the sand blanket. Photographs of the <br /> construction of the leach field are also available. <br /> I <br /> 20-1096-15/20191,293 Page I of <br /> Copyright 1998 Kleinfelder, Inc. May 13, 1999 <br /> KLEINFELDER 2825 East myrtle Street-Stockton, CA 95205-4794 (209)948-1345 (209)948-0621 fax <br />