Laserfiche WebLink
k" KLEINFELDER <br /> Test Number Depth, feet Percolation Rate (min./inch) <br /> Parcel 1 3.5 83 <br /> Parcel 1 10.0 Did not percolate <br /> Parcel 1 (retest) 3.5 16 ` <br /> Parcel 1 (retest) 9.0 250 <br /> Parcel 2 3.5 83 <br /> Parcel 2 12.5 8 <br /> Parcel 3 3.5 63 <br /> Parcel 3 (retest) 3.5 125 <br /> Parcel 3 (retest) 9.0 13 <br /> Parcel 4 3.5 42 <br /> Parcel 4 11.0 15 <br /> Parcel 5 3.5 Did not percolate <br /> Parcel 5 10.0 28 <br /> Following our percolation testing on October 7, a staff engineer with our firm obtained a sample <br /> of groundwater using clean procedures from a spigot near a well at 22191 Anderson Street, a <br /> residence on the west side of Anderson Street. The well is estimated to be less than 150 feet <br /> west of the proposed subdivision. The next day, the water sample was submitted to Sequoia <br /> Analytical using chain-of-custody procedures for DBCP and nitrate testing. The results of our <br /> tests and a copy of the chain-of-custody are attached. <br /> NITRATE LOADING CALCULATIONS <br /> Per SJC/EHD requirements, the following summarizes our nitrate loading calculations for the <br /> proposed leach fields. The State drinking water standard for nitrate is 45 milligrams per liter <br /> (NO3) and 10 mg/1 as Nitrogen (N) in groundwater. In our evaluation of nitrate loading, we have <br /> used the Hantzsche mass balance equation (source: Predicting Ground-Water Nitrate-Nitrogen <br /> Impacts, Hantzsche and Finnemore (1992)), which is presented below with an explanation for <br /> each factor and the value used in our study. The selection of parameters was based on previous <br /> studies and investigations performed by our firm and others, San Joaquin County Sewage <br /> Standards, communications with Mr. Mike Huggins with the SJC/EHD, and information <br /> provided in a report dated March 19, 1997 prepared by the Questa Engineering Corporation and <br /> authored by Mr. Hantzsche for a development in the Stockton area. <br /> N, =AWN W 0-D) +(Nb) <br /> AW+R <br /> 22276.G01/ST02R677 November 5,2002 <br /> ©2002 Kleinfelder,Inc. Page 3 of 5 <br />