SITE INFORMATION AND CORRESPONDENCE

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ADDITIONAL INFORMATION REQUIREMENTS • FOR REPORT OF WASTE DISCHARGE 4 CITY OF RIPON b. The potential for the proposed effluent disposal expansion to degrade groundwater quality C. This assessment must be made based on site-specific data and must provide technically-based answers to the following questions based on historical data and supplemental data to be collected for the purpose of.this study: d. What is the groundwater elevation and gradient at the existing facility? e. What is background shallow groundwater quality for typical municipal waste constituents? Compare to established water quality objectives. 1 f. For each monitored constituent, has the existing facility degraded groundwater quality? If so: • What constituents exceed the applicable water quality objective? • What constituents exceed background concentrations? • Based on site hydrogeology, is the degradation contained within a defined area(or one that could be defined by additional investigation)? g. What are subsurface conditions at the proposed new disposal site? 2 h. What is the character of groundwater quality at the proposed new disposal site?2 i. Based on site hydrogeology, the nature of the waste, and the proposed disposal method, what level of degradation is expected to result from the expansion(if any)? i. If the proposed expansion will cause degradation, how will the degradation be confined or controlled? k. At a minimum, the report shall include the following: • Rationale for field investigation approach. • Description and documentation of all proposed investigational methods and activities. • Description of the site hydrogeology including stratigraphy, groundwater elevation and gradient, transmissivity, and influence of all recharge and pumping sources (i.e., a site conceptual model). • Description of fate and transport mechanisms for all monitored constituents. • Description of data reduction/analysis techniques and results. • Presentation of historical and supplemental site-specific soil and groundwater data. • Comparison of groundwater quality data to background groundwater quality and water quality objectives for each constituent. • An analysis of all data and conclusions regarding each of the above questions. 1 Include analyses for the following: BOD,total coliform organisms,total dissolved solids, ammonia(as N),total Kjeldahl nitrogen,nitrate(as N),nitrite(as N), and a complete anion/cation scan with ion balance. Total coliform organisms shall be determined using the 15-or 25-tube method. 2 This must be based on subsurface investigation at the proposed disposal site including soil borings and/or cone. penetrometer tests and groundwater analyses. Groundwater samples may be obtained using a one-time sampling method such as Hydropunch®.