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NNW INTRODUCTION Mr. Robert Pombo has completed construction of a raised building pad and a raised filter bed disposal area adjacent to the building pad. It is anticipated that a house is to be moved onto this pad with the raised filter bed area serving as the effluent disposal area for this house. Since the pad and filter bed area were constructed on a"Designated Remainder" from a prior parcel split, the San Joaquin County Environmental Health Department(EHD)has stipulated that percolation testing must be done within the proposed disposal area. EHD is also concerned with the depth to groundwater. The static water table depth was estimated by sounding Mr. Pombo's on-site domestic well. PERCOLATION TESTING On June 27, 2005, at 1830 hrs, two shallow percolation test borings were hand-drilled, both to a depth of 36 inches in the southeast corner(SEC) and the northwest corner(NWC) of the proposed filter bed area. The bottom of these borings slightly extended into the underlying native soil. After drilling the percolation test borings, the bottom and sides were scarified to open smeared soil surfaces and the cuttings removed. Two inches of pea gravel was placed in the test borings, along with a three-inch O.D. PVC perforated pipe. The test borings were pre-saturated with 18 inches of clear water to ensure complete saturation. All pre-saturation water had seeped away in both borings by the start of percolation testing. Testing commenced on June 29, 2005 at 0600 Ins under San Joaquin County Environmental Health Procedure#2 guidelines. The final percolation rates obtained were 31.3 minutes per inch(min/in or mpi) for the southeast comer test boring and 35.7 min/in for the northwest comer boring. The following chart summarizes the percolation tests results in minutes per inch (mpi). PERCOLATION TEST RESULTS SUMMARY SOUTHEAST CORNER(SEC) NORTHWEST (NWC) CORNER OF FILTER BED OF FILTER BED PERCOLATION TEST AT THE 36 INCH DEPTH: PERCOLATION TEST AT THE 36 INCH DEPTH: 31.3 MIN/IN 35.7 MIN/IN Page 2 of 4 Chesney Consulting