8.2. SR 11-07-2016 - Laserfiche WebLink

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in close proximity to the Site. One well is located north of the Site and is upgradient of both the landfill and the Site. Two wells are located upgradient of the landfill and down gradient of the Site. The fourth well is located up gradient of the landfill and side gradient of the Site. The two wells that are located upgradient of the landfill and downgradient of the Site, 22 OWA and 312 OWA, were included in the 2015 summer quarterly groundwater sampling event 12. Nearby water supply wells and the Elk River Landfill Monitoring Wells are illustrated on Figure 9: Water Wells Within Half Mile of Site. Note that the Elk River Landfill has several more monitoring wells that are part of the landfill's monitoring well network. Figure 9 only indicates those monitoring wells described above, which are located within % mile of the Site. The well logs are included in Attachment 1 and the unique well numbers of the identified wells are: Water Supply Wells within % Mile of Site 417070 437275 500554 578937 650145 421447 456081 545375 609084 Landfill Monitoring Wells within % Mile of Site 498324 683321 420729 646853 b. Describe effects from project activities on water resources and measures to minimize or mitigate the effects in Item U. through Item b.iv. below. i. Wastewater- For each of the following, describe the sources, quantities and composition of all sanitary, municipal/domestic and industrial wastewater produced or treated at the site. 1) If the wastewater discharge is to a publicly owned treatment facility, identify any pretreatment measures and the ability of the facility to handle the added water and waste loadings, including any effects on, or required expansion of, municipal wastewater infrastructure. The mining operations will not discharge wastewater to a publically owned treatment facility. 2) If the wastewater discharge is to a subsurface sewage treatment systems (SSTS), describe the system used, the design flow, and suitability of site conditions for such a system. There is an existing individual sewage treatment system associated with the residence located in the northeastern portion of the Site. The estimated generation rate is 300 gallons per day. Domestic sanitary wastewater produced at the mine sites will not be discharged to a subsurface treatment system. Portable toilets will be used at the mine sites to serve employees. 12 Barr Engineering September 2015, 2015 Summer Quarterly Report, Elk River Landfill, Elk River, Minnesota. Environmental Assessment Worksheet Page 14 Elk River Sand and Gravel Mines: Tiller Corporation and Max Steininger, Inc.