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12/12/2008 11:40 2094769429 KENNETH N MELEYCO PAGE 07 <br /> Fax sent bg : 51884546069 BEAU DICItSOH -15-H8 a,4 :14 Pg: 5/9 <br /> Mr,Mo Hatef <br /> PmwFdd Wastewater FadirWK for tho Madlna Gender rX North 8tocktw <br /> Novemtwr IS,MS <br /> It is certain that the percolafion rates at the lower two levels in the Chesney r;port have <br /> been measured incorrectly. <br /> The use of similar percolation data and loading rates elsewhere nearby in Sr n Joaquin <br /> County have resulted in problems. <br /> The L c Of Design Information <br /> It is our impression that the Chesney report is being treated by the County !staff as an <br /> engineering report although the title of the report and the verbiage in the retort do not <br /> say that it is an engineering report. Page 22 of the County Onsite Wastewate r Disposal <br /> Standards requires that an alternate septic system (which this is) be desiiyned by a <br /> State of California Registered Engineer If the percolation rate is in the ranc a of 60 to <br /> 120 minutes per Inch. (See the *** footnote to the table on Page 21 of t'ie County <br /> Standards). Mr. Chesney is not a registered engineer. <br /> On Page 9. Chesney calculates that 670-feet of leach line are required. <br /> Based on the revised flow estimate in the spreadsheet, a 2400 gallon septic 1 ank would <br /> be required to provide a one day detention time. The required length of leach line would <br /> be: <br /> (2,400 Gallon BTC + 2,093 ADF) * 0.250 Soil Factor= 1,123 LF of Leash Line. <br /> Mr. Chesney proposes to provide some of the leach line requirement with Mach lines <br /> and the rest with seepage faits, but as discussed above, the percolation from each lines <br /> in the shallow soil is "virtually nonexistent". All of the percolation will therefore have to <br /> be done in the pits. <br /> The County standards, Page 18, allows a 36-inch seepage pit to be counted as 70-Fest <br /> of leach line. Using this value and the amount of leach line required that was calculated <br /> above, the required number of seepage pits will be: <br /> 1,123 LF of Equivalent Keach Line/70 LF Per 36" Pit = 16 Seepage Pit:. <br /> This is drastically different than what was "suggested" by Chesney. <br /> The site plan that as received by the County on October 28, 2008 shows € proposed <br /> layout of the onsite wastewater treatment and disposal system. The pro)osed soil <br /> wastewater infiltration system consists of three leach lines, each 45-feet Ion,I, with two <br /> seepage pits at the end of each leach line, Le. a total of six seepage pits. <br /> 5 <br />