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Spring of 1999 by San Joaquin County Flood Control and Water Conservation District (see Appendix). The subject parcel in this report has been used as a vineyard. The only potential for ground water contamination could be from pesticides or herbicides. The Surface and Subsurface Report prepared by Dillon & Murphy did not yield any unusual contamination concerns. A groundwater test was performed on the well located on the property. The sample was taken at a s i of at this well. The water was tested for nitrates and DBCP. The samples were taken by Mike Toy of Dillon & Murphy at the spigot at the well. The well is a standard rotary well for agricultural use. The samples were placed in a controlled environment for transport to Precision Enviro-Tech. Custody of samples were relinquished to staff at Precision Enviro-Tech '/2 hour after samples were taken (see chain of custody in Appendix). The nitrates were measured as 45 mg/L. The DBCP was measured at as non-detect (see Appendix for results). Based on water test results, potential for contamination is low. VI. SOIL PROFILE AND PERCOLATION TESTS Two test holes were excavated to a depth of 3.5 feet and 8 inches in diameter. The purpose of the test holes were to determine percolation rates in this area. For approximate location of the test holes, see the Tentative Parcel Map in , the Appendix. The holes were prepared in accordance with County Standards. The / holes were excavated on July 23, 20044-and filled to a measurement of 30 inches (12 inches above the gravel per County standards) with water for the - our ,c °� presoak period. On July 27, 2004, at 8:00 a.m. after the presoak period the hole contained no water, and the 4 hour test was preformed in accordance with County standards. The last half hour of the test for this parcel was witnessed by a County health official (Lisa Medina, SR. R.E.H.S.) and the test data is as follows: P46 Test Hole Percolation Rates u 1 24 min/inch 2 50 min/inch �•"`� (see Appendix for full test data sheet) Y1 �r Based on the percolation data obtained, it is recommended that a standard septic tank and leach lines (including a 12,000 sq/ft piece of land reserved for leach field) shall be sufficient for waste disposal. No pits required. Soils lithology in the general area of the test holes consisted of San Joaquin loam. As a shallow percolation test proved adequate for a conventional septic system, no further soil exploration was necessary. 2 C:/0399 SOILS REPORT 080204