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7Thiis RODUCTION s an Addendum to a Nitrate Loading Study and Soil Suitability Study I completed for roperty and proposed FerrellGasBlue Rhino project in December 2007 (SR0052935). The purpose of this Addendum is to provide the San Joaquin County Environmental Health Department(EHD) with updated information pertaining to the groundwater, soil, and design details of the wastewater management system. These studies comply with San Joaquin County Development Title, Section 9-1105.2(d). Mr. Tom Moriarty of Burns& McDonnell Engineering Company, Inc. provided the preliminary information to complete these Studies. Burns & McDonnell are the engineers for this project. Although this is an Addendum to Nitrate Loading/Soil Suitability Studies, Bolded Section (§) numbers normally found in an original report are used throughout this report for ease in referencing by EHD staff. These numbers are at the beginning of an applicable Paragraph(s), or Appendices that correspond with the EHD Requirements Checklist. Section Numbers referenced as SSS§, are sections applicable for the Soil Suitability Study Requirements Checklist. Section Numbers referenced as NLS§, are sections applicable for the Nitrate Loading Study Requirements Checklist. Not all Section Numbers are found in this Addendum because there was no change for those sections from the original report competed in December 2007. NLS§2.3, SSS§3.1. The subject property remains in the City of Lathrop Sphere of Influence,with the City limits just south of the subject property. City of Lathrop sewer facilities have not yet expanded to this area, but eventually will. This time frame is presently unknown. Domestic water for the subject property will be provided by a new on-site domestic well. Domestic wastewater disposal from the Blue Rhino facility will be managed by its own on-site septic system, not the system managing Preston Pipelines located adjacent to Manthey Road. SSS§ 1.2. The Blue Rhino company processes and refills propane gas cylinders for return and re- purchase at retail stores. The"existing site"property currently consists of approximately 2.07 acres. The "proposed expansion site" is to consist of 2.01 acres, for a total site of 4.08 acres. It is proposed to construct a building within the expansion site area to employ 24 people (office workers, field personnel, truck drivers, customers, etc.). Currently, the improvements made to the property include an asphaltic concrete circular driveway, an existing restroom with its own septic system (which is ultimately proposed to serve the improvements on the expansion site in addition to this existing restroom), gas cylinder storage areas, and fencing/lighting. The following is a summarization of this Addendum. Recommendations on the wastewater system design operational parameters are also discussed within this report: • The existing primary disposal area and the required 100% reserve/replacement areas have been described and are illustrated on the project Site Plans produced by Burns& McDonnell. • The on-site soils were analyzed: 1.) For the ability to accept proposed wastewater effluent flows, LLwasand2.)To assess the characteristics of the on-site leachfield soils to mitigate nitrate impact. This accomplished by soil physical and chemical testing. 1 Chesney Consulting