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15 May"2007 - AGE-NC707'1522 Page 3.of 5 /subj ect parcel. test hole was located in an ares where the proposed septic system is to be located. _- The test hole(TH-2)was advanced'to a depth of 68-inches below surface grade (bsg). 71 The soil.was visually,described in accordance with the Unified Soil Classification System by'a representative of AGE under the direct`supervision of a California .Professional Geologist:The soil sample collected from7H-2 consisted'of soils ranging from-silty sands to hardpan clays. Table 1:. SOIL.DESCRIPTION:TH-2 Depth Interval(ftibsg) SoilEDescription Soil°Classification 0-1 dry,-brown.silty sand SM: . 1-2'. =dry; brown hard pan clay CL dry;brown:klty/sand to ML sand /silt' G.O. :PERCOLATION TESTS - On 12--April 2007,'two borings were advanced.(TH-1-.and TH-2) for percolation rate testing.The'` borings were advanced using-a.4-:inch hand auger. A shallow and deep,boring was advanced during the initial.phase`of percolation testing:A°deep boring-was-advanced based on the probability of a ` shallow percolation test not passing due to knowvsoils in the subj ect.property area."Boring TH-1 was advanced to a depth of.40-inches and boring TH-2 .was advanced.to a depth.of'68-inches. The' borings were located more than 100 feet from the well currently under--construction and within'100 feet of the proposedseptic system location. . . ,. On 12'Apri12007,thesides"of each boring-were scraped and loose material was"removed from-the,. 1 "boring: Once each-boring wascleared,a 4-inch diameter PVC pipe withperforations on the bottom and 2 inches of fine'gravel'was added to each of the borings.Then the borings were f lied with water to a depth of`12 inches abovegravel at 0930 for test hole TH-1 and 0935 for test hole TH-2. Both test holes TH-1 and TH-2 were covered for.24 hours to allow saturation of the borings. /On,13. April'2007, test holes TH-1 and TH-2 were .inspected prior to initiation'of the 4-hour " percolation test. Borings TH=1 and TH-2 wereTound to be completely dry, but intact and in good - condition:-.Six inches of clean water was added to'the borings to initiate the 4-"hour percolation-test: The 4-hour,'percolation test-was performed by recording the_amount of water remaining in.each Advanced GeoEnvironmental,Inc.