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WASTE DISCHARGE REQUIREMAS AND MASTER RECLAMATION PERN*O. 12 CITY OF LATHROP WASTEWATER RECYCLING PLANT SAN JOAQUIN COUNTY an SSO in the time from adoption of this Order until self-certification of the SSMP is required by the State Board. Site-Specific Conditions 34:55. Annual precipitation in the vicinity averages approximately 13.31 inches. The mean pan evaporation rate is approximately 50.8 inches per year. With the exception of some of the River Islands land application areas and potential land application area No. A26 and A27 (described in the RWD) all areas proposed for wastewater collection, treatment, storage and reclamation facilities are outside the 100-year flood zone. Land application areas will not be irrigated except as needed to meet vegetation water needs. Saturated soil will not be irrigated with recycled water. 356. The facility lies within the San Joaquin Delta Hydrologic Unit Area No. 544.00, as depicted on interagency hydrologic maps prepared by the Department of Water Resources in August 1986. 36:57. Based on the National Resource Conservation Service soil survey,the soils in the proposed land application areas are sandy to silty clay loams. Published infiltration rates for the soils range from 0.06 to 6.0 in/hr. Groundwater Considerations 37-58. Groundwater currently used for municipal supply typically is drawn from wells that penetrate the Laguna Formation (approximately 150 to 1,000 ft. bgs). 34,59. Several consultants performed the initial groundwater monitoring work for the Discharger and no standardized approach was implemented. -59-.60. As City development progresses, some existing monitoring wells may prove to be unnecessary and/or in the way of construction activities. The RWD states that a number of the wells will be properly destroyed or relocated during construction of City infrastructure, recycled water storage ponds, or land application areas. 6&61. A damaged stormwater drainage pipe is locally dewatering the southern portion of the Mossdale Landing area. The broken pipe is located on the east side of Highway 5. The damaged pipe is near recycled water storage ponds and land application areas; therefore, it could allow more rapid transport of wastewater contaminants to surface water bodies and must be repaired. The Discharger has committed to repairing the damaged pipe by June 2008. Provision G.l.f of this Order requires completion of the repair. The repair will be completed before groundwater originating in the recycled water land application areas/storage ponds is likely to migrate to the drainage pipe. 64-62. A 26 April 2005 Groundwater Monitoring Workplan Addendum prepared by Hydrofocus was approved on 12 May 2005. The Addendum included a list of monitoring wells for the Mossdale Landing, River Islands, and wastewater treatment facility ()AW-1) locations. Some of the wells