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Soil Suitability/Nitrate Loading Study <br /> Proposed Global Carrier Inc. ■ Manteca, California 1rerracon <br /> August 8, 2018■ Terracon Project No. NA187034 <br /> 3.0 CONCLUSIONS AND RECOMMENDATIONS <br /> In summary, the soil conditions at the site consist of relatively permeable silty sandy soils near <br /> the surface to depths of 10 feet bgs resulting in a satisfactory percolation test rate of 22.7 minutes <br /> per inch. The parcel appears suitable for the use of a standard septic system utilizing shallow <br /> leach lines. All final septic system construction should follow the San Joaquin County On-Site <br /> Wastewater Disposal Standards where applicable. The results of the nitrate loading balance for <br /> the proposed development (5.9 mg/ L-N) indicate the proposed truck facility should not cause a <br /> buildup of nitrates in the aquifer above the MCL of 10 mg/L-N. Laboratory results for a <br /> groundwater sample collected from the onsite domestic well indicated elevated levels of Nitrate <br /> as N (13 mg/L) was detected slightly above the MCL. The nitrate balance calculation for the <br /> existing residential land use (4.3 mg/L-N) indicated the existing residence is not anticipated to be <br /> the source of the elevated nitrate levels identified in the groundwater sample. Based on the UC <br /> Davis groundwater study, the existing agricultural land use on the site and vicinity is anticipated <br /> to be the highest nitrate contributor to groundwater in the area. The onsite existing agricultural <br /> land use is proposed to be removed prior to development of the truck facility which may result in <br /> a reduction of onsite groundwater nitrate levels by removing a source of input. <br /> 4.0 LIMITATIONS <br /> Our professional services were performed, our findings obtained, and our conclusions proposed <br /> in accordance with generally accepted engineering principles and practices. This warranty is in <br /> lieu of all other warranties either expressed or implied. Test findings and statements of <br /> professional opinion do not constitute a guarantee or warranty, expressed or implied. <br /> Responsive■ Resourceful ■ Reliable 18 <br />