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his GEOTECHNICAL NEIL O. ANDERSON ENVIRONMENTAL A N D A S S O C I A T E S INSPECTIONS ✓< TESTING r LABORATORY SERVICES POOL ENGINEERING No POST TENSION DESIGN August 8,2007 Im NCIA Project Number;E07113A Mr. Joe Murphy low Dillon&Murphy Engineering 1820 West Kettleman Lane Lodi, CA 95240 on Subject: Percolation Test for Septic System Disposal Field APN: 053-040-34 & 02 16318 North Jack Tone Road Lodi, California 95240 Dear Mr. Murphy, Per your request, our office has conducted drilling and percolation testing on four parcels on the subject property which is located at the southeast corner of Jack Tone Road and Sargent Road in Lodi, California. The property is approximately 119 acres in size and is presently used for a dairy and residential. Mr. Joe Murphy of Dillon and Murphy Engineering, Lodi, requested that our office conduct a percolation test on each parcel to satisfy a requirement of the Environmental Health Department for siting new residential septic systems. The percolation test hole locations are shown on the attached parcel map. This location was determined by you to be near the site of the proposed septic system leach field. The drilling of four shallow test holes to approximately three feet in depth were drilled using a 4- inch diameter hand auger on July 12, 2007. A six and a half foot test boring was drilled on Parcel 1, a 24-foot test boring was drilled on Parcel 2, an 11-foot test boring was drilled on Parcel 3, and a six foot boring was drilled on Parcel 4,using a truck-mounted deep rock drilling rig with a 4-inch diameter auger. Two shallow holes to a depth of approximately three feet and two deep holes to a depth of approximately six feet were re-drilled on each parcel on July 22, 2007 using a 4-inch diameter hand augur. Please see Table 1 for more details regarding the percolation test holes. The soils in all of the holes were found to be brown silty clay with some cobbles from the surface to a depth of approximately 25 feet.No ground water was encountered in any of the test borings. Within the boring, an inch of"pea gravel' was placed in the bottom of the hole to stabilize the side wall from caving and prevent erosion while filling the boring. A 2-inch diameter PVC pipe with open ends and slots was placed in the hole. About six inches of pea gravel was placed in 60 the annular space around the pipe. The hole was pre-soaked 24 hours prior to the test with 12 inches of water above the bottom of the hole. r LODI ■ SACRAMENTO ■ MODESTO ENVIRONMENTAL DIVISION 902 Industrial Way,Lndi,California 95240 0 209.367.3701 ■ 209.369.4228 fax 0 w .noandeasonxom