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<br />e <br /> <br />w <br />CD <br />1\:. <br />00 <br /> <br />. <br /> <br />. <br /> <br />USBRIMWD SALINITY MANAGEMENT STUDY <br />FINAL REPORT <br /> <br />salinity at wastewater plants representing a cross-section of Southern California's <br /> <br />communities. <br /> <br />On a volumetric basis, Metropolitans supplies contribute about half of the salt entering the <br />coastal plain, Other sources of salt addition include municipal sewage, industrial uses an <br />irrigation (see Technical Appendix 10). Under a comprehensive regional approach, 0 <br />wastewater agencies should also endeavor to control salinity contributions into their <br />wastewater collection systems. Possible actions include: <br /> <br />Industrial Waste Discharge Permitting by Sanitary Districts/Cities <br />More stringent industrial permitting may help protect groundwater and recycled water <br />from salt loading. <br /> <br />Control of Brackish Groundwater Infiltration into Sewers <br />Sanitation districts and cities are responsible for controlling brackish groundwater <br /> <br />infiltration into sewers which supply water recycling projects. This problem is <br /> <br />troublesome in some coastal areas where seawater intrusion has reached and infiltrated <br /> <br />old, deteriorating residential, commercial and public sewer lines. In some locations, <br /> <br />rainfall temporarily raises the brackish water table, expanding the infiltration problem. <br /> <br />Agricultural Discharge <br />Discharge of waste from pastures and fertilization of irrigated crop land are local sources <br />of salt which have plagued Southern California groundwater quality for years. The <br />principal vehicle to control agricultural salts is enforcement of basin plan objectives and <br />waste discharge permits by RWQCBs. Figure 3-13 identifies the high salinity zone of the <br />Chino Groundwater Basin where there is a historical presence of dairies, Farmers and <br />local water districts are working together to develop effective basin management practices <br />to mitigate this legacy of high salinity groundwater. <br /> <br />Water Softeners <br />Reduce salt contributions from water softeners (see next paragraph). <br /> <br />BOOKMAN-EDMONSTON <br />ENGINEERING, INC. 3-23 <br />O:\LOCAlRESIANDYSISAlINlTY\JUNE98.2\7SECT3.DOC 07120/9810:59 AM <br /> <br />Section 3 <br />Evaluation of Potential Regional <br />Salinity Management Strategies <br /> <br /> <br /> <br /> <br /> <br />iO <br />