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Soil Suitability/Nitrate Loading Study Irerracon Vacant Commercial Property■ Stockton, California December 7, 2018 ■ Terracon Project No. NA187056 Groundwater was reported between 56 and 76 feet below grade surface (bgs) with a gradient to the east-northeast, across the site. Groundwater monitoring data did not identify contaminants in the on-site domestic well associated with the TPHg release ; however, based on the identified groundwater contamination reported on the site, the EHD should be consulted prior to future groundwater use. If the domestic well will remain not in use, Terracon recommends the well be abandoned in accordance with applicable laws and regulations. Based on the nitrate loading balance calculation, nitrate levels for the proposed future use is estimated to be 33.6 mg/L-N which is above the MCL of 10.0 mg/L-N. Mitigation may consist of the utilization of an advanced water treatment product such as those available by Orenco, which are specifically designed to lower nitrates at point of discharge or other mitigation options including the use of a carbon source such wood chips. Based on the proposed usage, mitigation will likely be required by the EHD. Based on a review of the. proposed site diagram, the southwestern portion of the parcel in the area of the former LUST and remediation area is proposed to be developed with a playground, basketball court, parking lot and drive areas. Future septic systems should not be placed in the vicinity of the former remediation area to avoid encountering potential residual soil and/or groundwater impacts. 4.0 LIMITATIONS This report was compiled as a Soil Suitability Study and Nitrate Loading Study for the site. This report contains information and data provided to Terracon by several sources. Terracon in no way warrants the accuracy or completeness of the information provided to this study by those sources. This report is not equivalent to a Phase I Environmental Site Assessment and does not meet ASTM E1527-13 standards. Terracon specifically disclaims responsibility for any unauthorized use of this report. The findings and conclusions of this report are not scientific certainties, but rather, probabilities based on professional judgment concerning the significance of the data gathered during the course of this study. Our professional services were performed, our findings obtained, and our conclusions proposed in accordance with generally accepted engineering principles and practices. This warranty is in lieu of all other warranties either expressed or implied. Test findings and statements of professional opinion do not constitute a guarantee or warranty, expressed or implied. Responsive■ Resourceful ■ Reliable 21