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oPQ'�1N' SAN JOAQUIN COUNTY 2 '2 ENVIRONMENTAL HEALTH DEPARTMENT 1868 East Hazelton Ave Stockton,CA 95205 (209)468-3420 • Fax: (209)464-0138 • Web: www.sjgov.org/ehd Nitrate Loading Study Requirement Checklist RECORD ID: SR0082056 SITE LOCATION: 5861 WEST KILE ROAD,LODI REPORT DATE:APRIL 30,2020 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 ® El 1.1 Description of the chemical and physical properties of the soils underlying the site. • Moderately permeable ® ❑ 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. • There is potential for surface contaminants to travel to groundwater if permeable soils exist to ground water 2.0 GROUNDWATER ANALYSIS ® El 2.1 Description of: depth to groundwater, seasonal fluctuations of groundwater depth, directional flow and gradient. • 20—25 feet. No directional flow or gradient identified ® ❑ 2.2 Description/discussion of any existing or potential groundwater contamination issues in the general location of the site. • None within 1 mile of the site ® ❑ 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. • Domestic drinking water, no development proposed 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. • Dairies, orchards and septic tanks • Inactive dairy located at 5748 West Kile Road, immediately adjacent to site approximately 800 feet South East of site 3.2 Description of impact of rainfall contribution of nitrate load to the project site. ® ❑ • CIMIS 11.78 inches of deep percolation per year, error of 45%. • Quality of rain water is 0.27 ppm from rainwater sample analysis ® ❑ 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. • Septic system use 250 gallons per day, 35 ppm—N concentration of effluent stream ® ❑ 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. • Only contribution is use from existing septic system ® ❑ 3.5 Calculated mass balance of nitrogen loading considering all potential sources identified. Use of Hanztch/Finnemore, or other appropriate formula/model, if applicable. • Nitrate loading estimate=3.4 ppm—Nitrate as N ® ❑ 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. ® ❑ 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. • No Nitrate mitigation is recommended EHD 26-02-002 Page 1 of 2 Nitrate Loading Study Checklist 7/14/2003