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i July 29,2003 Job Number: LG03-222 1 Page 6 Three(3), 3-foot percolation test borings and one (1) 10-foot soil boring were drilled on July 7, 2003. One percolation test boring was advanced in each parcel of the subject property (Plate 2). Generally, the soil encountered in the borings is similar to the soils reported by the San Joaquin ' County Soil Survey soil for.the area(USDA, 1993). Table 4 presents the soil log for the 10-foot soil boring at P-1;the first three feet described are representative of soil conditions encountered in all four borings. The 3-foot percolation test hole at P-1 was located adjacent to the 10-foot deep, soilrofile boring'. p Table 4. . I� Soil Boring Log for P-1. Depth Interval(ft) Soil Type Unified Soil Classification 0-3 Brown very fine sand with clay SC . 3-10 .Brown c12sand,grades to sandy clay, CL Three 3-ft deep (shallow test) percolation test holes were drilled,one on each parcel of the site. All three borings were drilled using a truck mounted Deep Rock auger rig. The 10-foot ground water boring was also drilled using a truck mounted deep rock auger rig. A 2-inch diameter PVC' -, pipe with perforations on the bottom was used to measure the drop of water in the percolation test boring. 'Approximately, 2 inches of"pea gravel" were placed in the bottom of the boring then !° the PVC pipe was installed on top of the gravel. Several feet of"pea gravel"were backfilled in the annular space..Presaturation of the percolation test holes occurred,on July.7, 2002. After the 24- hour soak period,the presaturated holes were found to be intact and dry on July 8, 2003. Measurement of the water level during the percolation test was from a fixed reference point on the PVC casing using an electric well sounder with an depth accuracy of 11100th foot. All values on the field data sheet are in decimal feet.. A 4-hour percolation test was conducted on July 8, 2003 in accordance with the requirements of San Joaquin County Environmental Health Division. The last half hour of all three tests was [' observed by Larry Godinho,-Environmental Health Inspector, of that office. A satisfactory ( percolation rate for a shallow (3400t deep)testis 60 min/in or less. The percolation test at P-1 ' achieved-a satisfactory percolation rat-e of 25 min/in,test P-2 achieved a satisfactorypercolation rate of 10.4,min/in, and test P-3 achieved a satisfactory percolation rate of 5 min/in. A summary of the percolation tests is presented in Table 5- ' o ti