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o 1 <br /> 1 3. When the turbidity of the groundwater is more than 25 NTU above or 125% of <br /> 2 the turbidity of the site stormwater runoff, whichever is greater, the groundwater <br /> 3 shall be treated separately from the site stormwater. <br /> 4 <br /> 5 Alternatively, the Contractor may pursue independent disposal and treatment <br /> 6 alternatives that do not use the stormwater conveyance system. I <br /> 7 <br /> 8 8-01.3(1)C2 Process Wastewater <br /> 9 Wastewater generated on-site as a byproduct of a construction process shall not be <br /> 10 discharged to surface waters of the State. Some sources of process wastewater may be <br /> 11 infiltrated in accordance with the NPDES Construction Stormwater General Permit. <br /> 12 <br /> 13 8-01.3(1)C3 Shaft Drilling Slurry Wastewater <br /> 14 Wastewater generated on-site during shaft drilling activity shall be managed and <br /> 15 disposed of in accordance with the requirements below. No shaft drilling slurry <br /> 16 wastewater shall be discharged to surface waters of the State. Neither the sediment nor <br /> 17 liquid portions of the shaft drilling slurry wastewater shall be contaminated, as <br /> 18 detectable by visible or olfactory indication (e.g., chemical sheen or smell). <br /> 19 <br /> 20 1. Water-only shaft drilling slurry or water slurry with approved flocculants may be <br /> 21 infiltrated on-site. Flocculants used shall meet the requirements of Section 9- <br /> 22 14.5(1) or shall be chitosan products listed as General Use Level Designation I <br /> 23 (GULD) on the Department of Ecology's stormwater treatment technologies <br /> 24 webpage for construction treatment. Infiltration is permitted if the following <br /> 25 requirements are met: <br /> 26 <br /> 27 a. Wastewater shall have a pH of 6.5 —8.5 prior to discharge. <br /> 28 <br /> 111 <br /> 29 b. The source water meets drinking water standards or the Groundwater <br /> 30 Quality Criteria listed in WAC 173-200-040. <br /> 31 I 32 c. The amount of flocculant added to the slurry shall be kept to the minimum <br /> 33 needed to adequately settle out solids. The flocculant shall be thoroughly <br /> 34 mixed into the slurry. a <br /> 35 <br /> 36 d. Infiltration locations shall be at least 100 feet away from surface waters, <br /> 37 wells, on-site sewage systems, aquifer-sensitive recharge areas, sole <br /> 38 source aquifers, and well-head protection areas. Before infiltration begins, <br /> 39 there shall be a minimum of 5 feet of unsaturated soil between the soil <br /> 40 surface receiving the wastewater for infiltration and the groundwater <br /> 41 surface (i.e., saturated soil). <br /> 42 <br /> 43 e. The slurry removed from the shaft shall be contained in a leak proof cell or <br /> 44 tank for a minimum of 3 hours. <br /> 45 <br /> 46 f. Within a 24 hour period, a maximum of 21,000 gallons of slurry wastewater <br /> 47 may be infiltrated in an infiltration location. The infiltration rate shall be <br /> 48 reduced if needed to prevent wastewater from leaving the infiltration <br /> 49 location. The infiltration site shall be monitored regularly during infiltration <br /> 50 activity. All wastewater discharged to the ground must fully infiltrate and <br /> 51 discharges must stop before the end of each work day. <br /> 52 <br /> I <br /> AMENDMENTS TO THE 2014 STANDARD SPECIFICATIONS BOOK <br /> Revised: 8/3/15 <br />