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Soil Suitability and Nitrate Loading Evaluation Page 4 U of P-Golf Practice Facility Expansion 6301 West Eight Mile Road Stockton, California May 13, 2019 CTE Job#25-0711 G properties resulted in a 1998 septic permit for the maintenance building located on the property approximately 300 feet south of the proposed leach field. No leach field replacement or other problems were indicated for that facility. As indicated above, the permit indicates 15 people are typically employed at the maintenance facility and the nitrate contribution from the existing leach field is included in the nitrate calculation below. Based on a search of the area within a 2000 foot radius of the site (using the California Water Boards GAMA Groundwater Information System (https://gamagroundwater.waterboards.ca.gov/gama/ amp/public/) indicates three wells to be present. Information regarding nitrates detected in each of these wells is included in the table below. TABLE 1 NITRATES IN GROUNDWATER AT NEARBY WELLS Well Number Results Chemical Date 03N05E36M002M 0.7 mg/1 NO3N 3/17/1965 03N05E35KOO1M 0.54 mg/1 NO3N 7/9/1976 02N05E02AOOIM 0.63 mg/1 NO3N 6/10/1976 AVERAGE = 0.623 mg/1 NO3N 5.0 FIELD INVESTIGATION The field investigation was conducted on April 24, 2019 and July 23, 2019 and included geologic reconnaissance, a groundwater boring, and a percolation test boring. The groundwater boring was drilled to maximum depth of approximately 15.0 feet using 4.0- inch diameter solid stem-auger and the percolation test hole was dilled to a depth of 36- inches using 6-inch diameter solid stem-auger. Groundwater observations were made in the holes during drilling and after completion. Soils were logged using the Unified Soil Classification System including consistency, color, texture, and gradation, on the bases of drill penetration resistance and observation ^, enc