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SAJOAQUIN coUNTY Environmental Health Department °4(ICOP�r Greatness grows here. 6.5 Description/discussion of any existing or potential groundwater contamination issues in the general location of the site.f 6.6 Location and description of any local recharge areas within 1-mile of the site. A4 6.7 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. ./ 6.8 Number, age and construction of wells onsite and within 1-mile of the site (annular seal depth) 6.9 Description of location (address/APN),type and construction of well and location (well head/ kitchen tap) where water sample(s) were obtained. nA 6.10 Description of constituents being tested for in the water sample.Testing methodology drinking water(specify approved test methods). /0 6.11 Description of how sample was obtained, handled, stored, and transported to the lab. I 6.12 Complete Chain of Custody document, including printed and signed name of third party sampler, condition of sample and date and time the sample was submitted to the lab. For Laboratory samplers, complete laboratory report to include the above noted information. 144 7.0 POTENTIAL NITRATE LOAD TO GROUNDWATER—CEQA Questionnaire 7.1 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. 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. 7.2 Calculated impact of nitrogen loading from site project to down gradient wells, rivers, lakes etc. 7.3 Hantzche and Finnemore Nitrate-Nitrogen Impacts Calculation 7.3.1 Residential—ADF minimum one SFR per parcel—use 70 gallons/person at double occupancy per bedroom. 7.3.2 Commercial ADF-calculated on maximum building occupancy at full approved build out or identifies a phase approach to full approved build out (each phase must be tied to a building permit and will require additional OWTS installation) 7.3.3 Nitrogen concentration in wastewater—residential- use 35 mg/I for up to one 4 bedroom house, provide for additional contribution for additional homes, people etc. Cite how this additional nitrogen was derived 7.3.4 Denitrification—use 10%or 0.1 for sand, 15%or 0.15 for sandy loam, 20%or 0.2 for loam, 25%or 0.2 for silt loam, 30%or 0.5 for clay loam, and 35%or .35 for clay. 7.3.5 Background nitrate-nitrogen in rainfall recharge at water table-use 1.0 mg/I 7.3.6 Deep recharge from rainfall—use last 10 years local CIMIS data. Use CIMIS data for evapotranspiration. 7.4 Discuss other site specific mitigating factors relating to nitrate loading to groundwater: 7.4.1 Highest groundwater level 7.4.2 Thickness(in feet) of vadose zone 7.4.3 Thickness(in feet) of clay in vadose zone 7.4.4 %clay in vadose zone 7.4.5 Number of OWTS in 1-mile radius of site ✓ 7.4.6 Number of sewered homes within 1-mile radius of the site 7.4.7 Location and distance to nearby public water supply wells N/a 7.4.8 Number of water wells within 1-mile radius of site, or service by public water system 7.4.9 Age, total depth, annular seal depth of water wells at the site and within 1-mile radius 7.4.10 Nitrate concentration in onsite well(s) ,A 7.4.11 Nitrate concentration in nearby wells—use EHD map 7.4.12 Nitrate concentration in nearby public wells-use Drinking Water Watch https://sdwis.waterboards.ca.gov/PDWW/ 7.4.13 Site located within a city sphere of influence 7.4.14 EHD 26-02-002 Page 3 of 2 Nitrate Loading Study Checklist 7/14/2003