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lierracon Soil Suitability / Nitrate Loading Study <br />Azevedo Property Acampo, CA <br />June 19, 2019 Terracon Project No. NA197009 <br />1.5.4 Discussion of Soil Lithology <br />The soils encountered in our percolation test borings were generally medium grained sandy clay <br />to clayey sandy soils. Generally speaking, coarse-grained soil has a greater potential for <br />percolation than fine-grained or cemented soil. <br />Terracon searched the DWR online Well Completion Records for additional information regarding <br />soil lithology within 0.5 miles of the site. The following water supply well was identified nearest <br />the site. <br />Table 6. <br />Well Completion Reports. <br />WCR Number Latitude Longitude Depth <br />(Feet) <br />Approximate <br />Distance/Direction from Site <br />WCR2016-002802 38.207222 -121.171944 275.00 0.25 mites Northwest <br />WCR2016-009681 38.194444 -121.172778 340.00 0.58 mites Southwest <br />Based on a review of the Well Completion records, the soils within the vadose zone (between 0 <br />to 130 feet bgs) are anticipated to consist of clay, sand, sandy clay, and sandstone strata. Refer _ <br />to Appendix G for a copy of the Well Completion record. <br />1.6 Percolation Test Information <br />1.6.1 Percolation Test Locations <br />Refer to Section 1.5.1 and Appendix A, Exhibit 2. <br />1.6.2 Number of Percolation Tests <br />Two percolation tests (B1 and B2) were performed. <br />1.6.3 Boring. Preparation and Presaturation <br />The percolation test borings (B1 and B2) were drilled on April 17, 2019. _Approximately two inches <br />of "pea gravel" was placed in the bottom of the open boring. A 2.0-inch diameter PVC pipe with <br />perforations towards the bottom was installed on top of the gravel and the annular space was <br />backfilled with "pea gravel". Presaturation of the percolation test hole occurred approximately 24 <br />hours prior to the day of testing. The depth of water used to pre-soak the shallow borings was <br />approximately 1.0 foot above the top of the gravel. <br />1.6.4 Condition of Borings after Presaturation <br />Borings B1 and B2 were dry and intact after the 24-hour pre-soak period. <br />Responsive Resourceful Reliable 10