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a I. INTRODUCTION This report contains the results of the Nitrate Loading Study, Soil Suitability Study and Manure Management Plan conducted by Chesney Consulting for the existing Danny Rocha Dairy Facility. The subject dairy is located northeast of the city of Tracy, at the northwest corner of Arbor Road and Paradise Road. The facility is currently milking 750 Holstein cows with associated support stock. There is no proposal at this time to increase the size of the facility, or the number of animal units. The ranch is situated on approximately 170 acres with the actual dairy facility occupying 9&_11 r^ approximately 28 acres of the total acreage. This study is in compliance with the requirements of Section.9-1110 item (c) and Section 9-1105.2(d) of the San Joaquin Community Development Title. The on-site sewage disposal systems for two proposed single-family residences as described herein, complies with the Sewage Standards of San Joaquin County, and the EPA Desilzn Manual for On-Site Wastewater Treatment and Disposal Systems. The San Joaquin County Environmental Health Department(EHD) considers nitrate contamination a serious threat to surface waters and groundwaters of the County. High nitrate concentrations in drinking water can have deleterious effect on infants and fetuses, and may also induce abortion in cattle. The United States Environmental Protection Agency (EPA) has determined 10 mg per liter of nitrate-nitrogen (NO3-N), equivalent to 45 mg per liter nitrate (NO3) in drinking water to be the Maximum Contaminant Level (MCL). By conducting these types of investigations,the County is better able to locate, quantify and monitor the potential for nitrate impact and impose prevention and/or mitigation measures. Future investigations of this type may include comprehensive nutrient and irrigation water management plans for all new and/or existing confined animal facilities. The purpose of this investigation was threefold: ❑ Of the total dairy site acreage, 10 acres each have been sold to two separate parties. Written agreements have been formed between these owners and Mr. Rocha (See Appendix H) for Mr. Rocha to continue to farm and apply nutrient water to a portion of these two parcels, as illustrated in Table 1 on Page 3. Therefore, EHD wants assurance that sufficient acreage remains over the en-t-ir-e—d-ai-Fy779ite to apply dairy nutrients without exceeding crop requirements. ❑ To ensure that the septic systems proposed for the two new single family residences will function properly as intended, and meet the requirements of the EHD. This will be ;l determined through percolation testing and soil analysis. I ❑ This document also serves as a directive toward best management practices of the nutrients (solids and liquids). Two major improvements are scheduled to be implemented on the Rocha Dairy. The first improvement will be a second holding pond to be excavated to the west of the existing pond. This will allow for greater control over nutrient water distribution and management. The second improvement is two tailwater ponds to be installed near the northwest corner of the ranch and next to the open corrals, to recycle tailwater back to top of the fields and prevent possible intrusion of nutrient irrigation water into Tom Paine Slough. 2 Chesney Comidting a