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1 sources of process wastewater may be disposed via independent disposal and treatment <br /> 2 alternatives in compliance with the applicable WACs and permits. <br /> 3 <br /> 4 8-O1.3(1)C3 Shaft Drilling Slurry Wastewater • <br /> 5 This section is revised to read: <br /> 6 1 7 Wastewater generated on-site during shaft drilling activity shall be managed and disposed <br /> 8 of in accordance with the requirements below. No shaft drilling slurry wastewater shall be <br /> 9 discharged to surface waters of the State. Neither the sediment nor liquid portions of the <br /> 10 shaft drilling slurry wastewater shall be contaminated, as detectable by visible or olfactory <br /> 11 indication (e.g., chemical sheen or smell). <br /> 12 <br /> 13 1. Water-only shaft drilling slurry or water slurry with accepted flocculants may be ' <br /> 14 infiltrated on-site. Flocculants used shall meet the requirements of Section 9- <br /> 15 14.5(1) or shall be chitosan products listed as General Use Level Designation <br /> 16 (GULD) on the Washington State Department of Ecology's stormwater treatment <br /> 17 technologies webpage for construction treatment. Infiltration is permitted if the <br /> 18 following requirements are met: <br /> 9 <br /> 2 <br /> 20 a. Wastewater shall have a pH of 6.5 — 8.5 prior to discharge. <br /> 21 <br /> 22 b. The amount of flocculant added to the slurry shall be kept to the minimum <br /> 23 needed to adequately settle out solids. The flocculant shall be thoroughly <br /> 24 mixed into the slurry. <br /> 25 <br /> 26 c. The slurry removed from the shaft shall be contained in a leak proof cell or <br /> 27 tank for a minimum of 3 hours. <br /> 28 <br /> 29 d. The infiltration rate shall be reduced if needed to prevent wastewater from I <br /> 30 leaving the infiltration location. The infiltration site shall be monitored regularly <br /> 31 during infiltration activity. All wastewater discharged to the ground shall fully <br /> 32 infiltrate and discharges shall stop before the end of each work day. <br /> 33 <br /> 34 e. Drilling spoils and settled sediments remaining in the containment cell or tank <br /> 35 shall be disposed of in accordance with Section 6-19.3(4)F. <br /> 36 <br /> 37 f. Infiltration locations shall be in upland areas at least 150 feet away from <br /> 38 surface waters, wells, on-site sewage systems, aquifer sensitive recharge <br /> 39 areas, sole source aquifers, well head protection areas, and shall be marked <br /> 40 on the plan sheets before the infiltration activity begins. <br /> 41 <br /> 42 g. Prior to infiltration, the Contractor shall submit a Shaft Drilling Slurry <br /> 43 Wastewater Management and Infiltration Plan as a Type 2 Working Drawing. <br /> 44 This Plan shall be kept on-site, adapted if needed to meet the construction <br /> 45 requirements, and updated to reflect what is being done in the field. The <br /> 46 Working Drawing shall include, at a minimum, the following information: <br /> 47 <br /> 48 i. Plan sheet showing the proposed infiltration location and all surface <br /> 111 <br /> 49 waters, wells, on-site sewage systems, aquifer-sensitive recharge areas, <br /> 50 sole source aquifers, and well-head protection areas within 150 feet. <br /> 51 1 <br /> City of Everett Page AM-70 Amendments <br /> Everett Downtown Streetscape Improvement March 22, 2019 <br />