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Puccinelli Residence Page No. 4 be observed by our office to verify that the soils encountered are those which were anticipated and designed for. A minimum of 4 inches of clean gravel should be placed beneath the slab-on-grade. This gravel should be well graded between a maximum size of 1 inch and a minimum size of 1/4 inch with zero percent passing the No. 4 sieve. Where passage of moisture through the slab would be detrimental, an impervious vapor barrier should be provided such as 6 mil visqueen or equivalent. Two inches of sand should be placed over the visqueen to protect it during construction and to aid in curing the concrete. PERCOLATION TEST A shallow test hole was excavated in the area of the proposed leach field (see the attached location map) and cemented soils were encountered at a depth of 2.0 feet. It was apparent that these cemented soils would be very slow to percolate, so a 24 foot deep by 6 inch diameter test hole was drilled in order to perform a deep pit percolation test. The soil profile of the deep pit percolation test hole .was logged by a civil engineer. A description of each soil encountered is attached as Log of Deep Pit Percolation Test Hole. Fairly clean sand was encountered in the test hole from a depth of 20 feet to 24 feet. Two inches of gravel was placed in clic hottont of the; test hole Ill 11 (1cplh of 24 feet. A 4 inch diameter perl.oralcd pipe was Own placed in the ho11e ,111(1 I)ackfilled wish gl;lvel. The test hole was filled with water 24 hours prior to running the percolation test. The last half hour of the test readings were witnessed by a county health official and the test data obtained is attached. The percolation rate has been adjusted to account for the gravel and pipe backfill. Calculations for adjustments are on the test data sheet. A summary of the test results is presented next: Diameter of Depth of Test No. Hole Hole (ft.) Percolation Rate (min/in) PT-1 6 24 30 �0ERSO P 1. a 4A z W a A� P ,SS 0 G\