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/ KLEINFELDER TABLE l Depth Percolation Rate Lot Number Test Number feet min./inch Lot 1 P-1 3.3 7.8 Lot 1 P-1 9.3 4.2 Lot 8 P-8 3.1 19.2 Lot 8 P-8 8.8 7.1 Lot 9 P-9 3.3 5.4 Lot 9 P-9 17.3 125.0 Lot 16 P-16 3.3 DNP Lot 16 P-16 11.0 4.9 Lot 17 P-17 3.3 DNP Lot 17 P-17 8.1 14.7 Lot 18 P-18 33 DNP Lot 18 P-18 14.2 7.8 Lot 24 P-24 3.2 125.0 Lot 24 P-24 10.0 5.1 Lot 25 P-25 3.3 83.3 Lot 25 P-25 9.9 15.6 Lot 26 P-26 3.5 50.0 Lot 26 P-26 12.1 5.8 Lot 28 P-28 3.2 125.0 Lot 28 P-28 13.8 3.8 DNP=did not percolate On June 18, 2003, a staff engineer with our firm obtained a sample of groundwater using clean procedures from a spigot on the residential well located at Lot 1 at the subject project. The samples were immediately placed in a chilled cooler and stored in a refrigerator at our office. That same day, the water sample was submitted to Alpha Analytical using chain-of-custody procedures for DBCP and nitrate testing. The results of our tests and a copy of the chain-of- custody are attached. NITRATE LOADING CALCULATIONS Per SJCEHD requirements, the following summarizes our nitrate loading calculations for the proposed leach fields. The state drinking water standard for nitrate is 45 milligrams per liter (NO3) and 10 mg/l as Nitrogen (1) in groundwater. In our evaluation of nitrate loading, we have used the Hantzsche mass balance equation (source: Predicting Groundwater Nitrate-Nitrogen Impacts, Hantzsche and Finnemore (1992)), which is presented below with an explanation for each factor and the value used in our study. The selection of parameters was based on previous studies and investigations performed by our firm and others, San Joaquin County Sewage Standards, communication with Mr. Mike Huggins with SJCEHD, and information provided in a report dated March 19, 1997 prepared by the Questa Engineering Corporation and authored by Mr. Hantzsche for a development in the Stockton area. 32585.G01/ST03R1168 August 13,2003 ©2003 Kleinfelder,Inc. Page 4 of 6