KLB Construction Inc 11/20/2018 - Laserfiche WebLink

I 1 8-01.3(1)C2 Process Wastewater 2 This section is revised to read: I3 4 Wastewater generated on-site as a byproduct of a construction process shall not be 5 discharged to surface waters of the State. Some sources of process wastewater may be I 6 infiltrated in accordance with the CSWGP with concurrence from the Engineer. Some 7 sources of process wastewater may be disposed via independent disposal and 8 treatment alternatives in compliance with the applicable WACs and permits. I 9 10 8-01.3(1)C3 Shaft Drilling Slurry Wastewater 11 This section is revised to read: I 12 13 Wastewater generated on-site during shaft drilling activity shall be managed and 14 disposed of in accordance with the requirements below. No shaft drilling slurry 15 wastewater shall be discharged to surface waters of the State. Neither the sediment nor I 16 liquid portions of the shaft drilling slurry wastewater shall be contaminated, as 17 detectable by visible or olfactory indication (e.g., chemical sheen or smell). 18 ' ' 19 1. Water-only shaft drilling slurry or water slurry with accepted flocculants may be 20 infiltrated on-site. Flocculants used shall meet the requirements of Section 9- 21 14.5(1) or shall be chitosan products listed as General Use Level Designation ' 22 (GULD) on the Washington State Department of Ecology's stormwater 23 treatment technologies webpage for construction treatment. Infiltration is 24 permitted if the following requirements are met: I 25 26 a. Wastewater shall have a pH of 6.5 — 8.5 prior to discharge. 27 I 28 b. The amount of flocculant added to the slurry shall be kept to the minimum 29 needed to adequately settle out solids. The flocculant shall be thoroughly 30 mixed into the slurry. I 31 32 c. The slurry removed from the shaft shall be contained in a leak proof cell or 33 tank for a minimum of 3 hours. 34 35 d. The infiltration rate shall be reduced if needed to prevent wastewater from 36 leaving the infiltration location. The infiltration site shall be monitored 37 regularly during infiltration activity. All wastewater discharged to the 1 38 ground shall fully infiltrate and discharges shall stop before the end of 39 each work day. 40 I 41 e. Drilling spoils and settled sediments remaining in the containment cell or 42 tank shall be disposed of in accordance with Section 6-19.3(4)F. 43 I 44 f. Infiltration locations shall be in upland areas at least 150 feet away from 45 surface waters, wells, on-site sewage systems, aquifer sensitive recharge 46 areas, sole source aquifers, well head protection areas, and shall be I 47 marked on the plan sheets before the infiltration activity begins. 48 49 g. Prior to infiltration, the Contractor shall submit a Shaft Drilling Slurry 50 Wastewater Management and Infiltration Plan as a Type 2 Working 51 Drawing. This Plan shall be kept on-site, adapted if needed to meet the 52 construction requirements, and updated to reflect what is being done in IWEST MARINE VIEW DRIVE UTILITIES PAGE 32 OF 60 August 2018 WORK ORDER#3588 I WSDOT AMENDMENTS Rev 4/2/18