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SAN JOAQUIN COUNTY r. ? ENVIRONMENTAL HEALTH DEPARTMENT 1868 East Hazelton Ave Stockton, CA 95205 P (209)468-3420 • Fax: (209)464-0138 • Web:www.sjgov.org/chd Nitrate Loading Study Requirement Checklist RECORD ID: SR0081894 SITE LOCATION: 6565 WEST HOWARD ROAD,STOCKTON REPORT DATE:03/16/2020 S = Sufficient San Joaquin County Development Title Chapter 9-1105,Section 9-1105.2 1 = Insufficient S I 1.0 CHEMICAL AND PHYSICAL PROPERTIES OF SOIL 1.1 Description of the chemical and physical properties of the soils underlying the site. ® ❑ Report states that clayey soils will restrict downward movement of water and may provide denitrification through soil adhesion . ® ❑ 1.2 Description of the mass transport properties of the soils underlying the site with respect to nitrate and/or any other constituent of concern identified for the project site. -Report states that clay soils may denitrify septic system effluent through adhesion to soil particles 2.0 GROUNDWATER ANALYSIS ® ❑ 2.1 Description of: depth to groundwater, seasonal fluctuations of groundwater depth, directional flow and gradient. 4-10 feet below the surface grade ® ❑ 2.2 Description/discussion of any existing or potential groundwater contamination issues in the general location of the site. Agricultural use of fertilizers, pesticides and herbicides ® ❑ 2.3 Description of the current use of groundwater at the site and of the future expected use of groundwater as related to the proposed development project. None, no development is planned 3.0 SOURCES AND CALCULATED IMPACT OF NITRATE TO GROUNDWATER ® ❑ 3.1 Description of all current off-site sources of nitrate to soil and groundwater in the general up gradient area and the contribution of nitrate load from these sources to the project site. Orchards and row crops-fertilization ® ❑ 3.2 Description of impact of rainfall contribution of nitrate load to the project site. -CIMIS Holt Station 4.04 inches per year ® ❑ 3.3 Description of all current on-site sources of nitrate to soil and groundwater and the contribution of nitrate load from these sources to the project site. -Rainwater nitrate loading of 0.3 mg/L-N ® ❑ 3.4 Description of all proposed future on-site sources of nitrate to soil and groundwater and the contribution of nitrate load from these sources to the project site. Report Calculated proposed residence with 500 gal/day per parcel. (Two parcels) ® ❑ 3.5 Calculated mass balance of nitrogen loading considering all potential sources identified. Use of Hanztch/Finnemore, or other appropriate formula/model, if applicable. Calculated nitrate for future residences ® ❑ 3.6 Calculated impact of nitrogen loading from site project to down gradient wells, rivers, lakes etc. 4.0 DISCUSSION OF NITRATE LOADING RESULTS RELATIVE TO PROPOSED METHOD OF WASTEWATER DISPOSAL 4.1 Discussion of total nitrate impact from proposed project. ® ❑ With no development nitrate loading is 0.3 mg/L of nitrogen. With development the nitrate loading is 0.5 and 0.6 mg/L for parcels 1 and 2. ® ❑ 4.2 Description of the methods proposed to mitigate any known or future impact to soil and groundwater from nitrate, and/or any other constituent of concern, at and/or around the project site. 5.0 CONCLUSIONS AND RECOMMENDATIONS SECTION ® ❑ 5.1 The report was signed, dated and stamped by a qualified environmental professional. ® ❑ 5.2 The attachments/appendices contain sufficient documentation to support claims made in the report. Reviewed By: Aaron Gooderham\4 Reviewed Date: 04/07/2020 EHD 26-02-002 Pagel of 2 Nitrate Loading Study Checklist 7/14/2003