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inch depth. <br />Therefore, the tests were performed at the 24 foot depth. The test results indicate a perc rate of 7.5 <br />min/in and 3.0 min/in for parcel 2 and parcel 3, respectively. Considering the relatively high clay <br />content of the subject site soils at the 24 foot depth, these are considerably faster rates than <br />what was expected. The high gravel content at the bottom of the test borings was sufficient to <br />promote comparatively rapid percolation. <br />We are recommending a 12,000 square foot leachfield area be constructed due to the high clay <br />content at the 42 inch leachfield depth. In addition, seepage pits will have to be utilized at the ends <br />of the leachlines. A discussion of these rates and recommendations will follow in the Conclusions <br />section of this report. <br />[51 LOCAL GROUNDWATER AND SURFACE WATER INFORMATION <br />The 1992 "Lines of Equal Depth of Water in Wells" map produced by the San Joaquin County <br />Flood Control and Water Conservation District indicates the static water level is located at <br />approximately 130 feet below grade in the area of the subject site. Therefore, the ten foot <br />minimum distance between the bottom of a seepage pit and the water table will be easily <br />achieved. The groundwater flow appears to be toward the south, although many factors can <br />influence this localized groundwater directional flow. <br />The Environmental Health Department has requested that nitrate concentration be tested from <br />the on-site irrigation well. This well was not in service at the time of this report. When it is <br />started again, a sample will be drawn for analyses and submitted to the Department at that time. <br />As can be noted from the plot map, Littlejohn Creek is adjacent to the proposed homesite on <br />parcel three. All distance requirements pertaining to septic system structures in relation to this <br />creek must be strictly followed. <br />3 <br />Q°fity e6wi I <br />