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Cary Keaten • 2 • 26 January 2004 <br /> Staff have the following more specific comments on the RWD: <br /> 1. Please provide the Assessor Parcel Numbers for all properties that will be used for the treatment, <br /> storage, and/or disposal of wastewater. A sheet attached to Form 200 includes a list of Assessor <br /> Parcel Numbers but there is no way for a reader to determine where each of the listed parcels is. <br /> Please prepare a table that lists street address, acreage, elevation, depth to groundwater, and owner. <br /> The table must reference and identify the parcel locations on a figure. <br /> 2. Some of the figures are illegible either because of scale, interfering text or symbols, or failure to <br /> contrast the item(s) that are being presented on the figure. For example Figures 2, 4-2, 6-2, and <br /> 7-10 do not clearly present the item under consideration. Several of the drawings refer to "Dublin <br /> San Ramon Sewer District;"please remove that reference. <br /> 3. Some of the figures, text, and tables contain information on future phases of development. To <br /> clarify the RWD for this phase,please remove all storage areas and land areas that are not proposed <br /> for the present phase of development. Each storage area and land application area must be named <br /> or numbered to allow meaningful discussion of each site. Please add a legend to Figure 7-14. <br /> 4. The discussion of the wastewater collection system in Attachment No. 4 is inadequate because it <br /> does not clearly describe the system that is proposed. The Discharger must finalize the plan and <br /> submit it for Regional Board review. Please remove all statements that are ambiguous such as <br /> "may be,5f"current discussions," `.recommended,' etc. <br /> 5. Attachment 6 states that sodium hypochlorite will be used to periodically clean the membranes. <br /> Please perform an evaluation of the opportunities for use of more environmentally friendly <br /> chemicals such as potassium hypochlorite or other chemicals that will be taken up by the crops and <br /> not affect soil structure. <br /> 6. Attachment 6 includes a description of the plant reliability features. It is noted that the membrane <br /> system includes two treatment trains. If one train goes down the remaining train cannot treat the <br /> anticipated wastewater that will arrive at the plant and the short-term storage (950,000 gallons in <br /> the equalization tank) is unlikely to provide even one day of storage. Therefore, any failure is <br /> likely to result in partially treated wastewater being discharged to Pond No. 3. Please elaborate on <br /> the statement contained in the Wastewater Influent Equalization and Reliability section of <br /> Attachment 6, "Sufficient detention is available to resolve problems by using standby equipment, <br /> modifying units in service, or employing temporary measures to meet recycled water treatment <br /> requirements." What temporary measures are planned? Are these measures compliant with Title <br /> 22? <br /> 7. Attachment 6 states effluent will be stored in Pond No. 3, the same pond that inadequately treated <br /> wastewater might be discharged to. Coliform regrowth will occur in the pond no matter if the <br /> wastewater complies with the Title 22 standard or not. Because inadequately treated wastewater <br /> will also be discharged to the pond, it will be impossible to distinguish between regrowth and <br /> inadequately treated wastewater for discharges to the off-site storage ponds. Secondary <br /> disinfection may be required prior to land application. Because storage ponds are located in <br /> remote locations, please address how this potential requirement will be addressed and obtain DHS <br /> approval for your plan. <br /> V.Sm JopumNan156u=bnmT an Ioa9uiuVU rPo W W BR Pham I KnIM 22 Jm U.M <br />