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12112/2008 11:40 2094769429 KENNETH N MELEYCO PAGE 06 Fax cent by : 51084546069 BOWEAU DIUSON i5-88 1' :is Pu; 4/9 Mr.Mo Nates Proposed wastewater FadNes for the My irm Center Of North Stockton November 15,2608 This is confirmed by Chesney's finding in the next to the last paragraph on F age 2 that there have been 17 permit applications for repairs/replacements/additlons o existing septic systems within one half mite of this site and the percolation rate of 2! o minutes per inch in the shallow soils. Obviously this area is very marginal for soil disposal systems. This fact is we i known to the Community Development Department. In Table 1 on Page 4 and Table 2 on Page 5, Chesney presents informat on on the analyses of the samples from three different depths as follows. Sample Depth Sand, Silt, And Soil Classification Pero Rate -oading Clay % MinutesllnCh Rate G WSF-Da 42-inches 30%, 24%, 45% Clay 250 0,200 12-feet`' 20%, 320/6, 47% Clay 16.7 0.700 25-feet" 36%,_30%, 32% 1 Cla loam 7.4 0.971 *Actual depths were 10.7-feet and 22.0-feet. The percolation rate of 250 minutes per inch matches Chesney's Cammentz about the shallow soil having a percolation rate that is"virtually nonexistent". (See above). Most standards define a percolation rate of greater than 240 minutes per ino-i as being unsuitable for soil absorption systems. A loading rate of even 0.200 gallons per square foot per day would be very Optimistic for such a slaw percolation rate. The two percolation rates at greater depth clearly do not match the soil df scriptions. Note that there is even more clay at the 12-foot depth (47% versus 45`o) yet the percolation rate is down to 16.7 minutes per inch from 250 minutes per inch. This is not credible. The percolation rate at 25-feet was measured as 7.4 minutes per inch even though there is 33% clay in the soil at this depth. Again, this i6 not credible. Page 214 f h SOPA Desi n Manual Attached are copies of the cover"sheet and Pa o the U t R 9 Onsite Wastewater.Treatment And DiSPOsal_SYstems. One can see in Ta)le 7-2 on Page 214 that a soil with a percolation rate of 7.4 minutes per inch is expec+ad to be a "fine sand, loamy sand" and that a soil with a percolation rate of 16.7 minutes per inch is expected to be a "sandy loam, loam". These are not at all the soils that are described by Chesney's report. 4