Specifications include, but are not limited to: DEWATERING: Task 1. Site Inspection, Data Collection and Reporting: The objective of this task is to monitor the rate and volume of groundwater pumped, groundwater drawdowns, use of groundwater, and water quality, thereby assisting the CITY in managing the dewatering activities. The data collection will enable accurate reporting and oversight of dewatering activities, helping to minimize the negative effects that dewatering may potentially have on the source and receiving environments. Continuous monitoring will assure the quality and accuracy of anticipated analytical values during dewatering operations associated with the installed system.; Communication with City Staff will be necessary for success of the monitoring program. For Sites Using Controlled Groundwater Pumping (Non-Exclusionary Technique): 1.1 Meet with City staff as needed (virtually/in person and/or field visits) to discuss initiation and completion of projects, equipment set-up and oversight, site observations and data collection and analysis.; 1.2 Record and file drawdown levels at onsite monitoring locations daily during the two- week warm-up period.; 1.3 Record and file flow meter data for the settling tank discharge and water fill station daily during two-week warm-up period.; 1.4 File water quality test results provided by City staff on a weekly (or less frequent) basis for the duration of the dewatering activity. Prepare data to be uploaded to City website.; 1.5 Record and file flow rate and drawdown data for each site every two weeks after the two-week warm-up period.; For Sites Using Groundwater Exclusionary Techniques (Cut-off or Secant Walls): 1.7 Meet with City staff as needed (virtually/in person and/or field visits) to discuss initiation and completion of projects, equipment set-up and oversight, site observations and data collection and analysis.; 1.8 Record and file drawdown levels at onsite monitoring locations daily during the initial two weeks.; 1.9 Record and file drawdown levels at onsite monitoring locations weekly after the first two weeks.; 1.10 Record and file flow meter data for the settling tank discharge daily during twoweek warm-up period.; Task 2. Dewatering Season End Report: The Dewatering Season End Report will summarize the performance of the dewatering activities construction season (typically April through October but may extend into winter months). Field parameters and monitoring data will determine if dewatering activities were sufficiently planned to minimize the volume of groundwater pumped and if data collection methods resulted in quality control and accuracy.; 2.1CONSULTANT shall prepare a Dewatering Season End Report for all sites. Report shall include: (a) Site-specific information such as dewatering start/end dates, average flow rate, total volume pumped, amount reused, water quality, and any specific issues that may have occurred at the site (such as design revision, rain delay, power outage, etc.).; (b) Type of dewatering operation used at each site such as typical well-point dewatering or cutoff wall design.; (c) Report should contain a summary of what went right, what went wrong, and “lessons learned” with suggestions for revisions for improvement to the next dewatering season.; Task 3 – Review Geotechnical Study and Dewatering Plans: This task is on an as needed basis. The CONSULTANT shall review submitted geotechnical studies and dewatering plans to ensure site dewatering activities have been assessed for the most practical operational methodology, analytical data and procedures, and importantly the impacts of groundwater extraction are performed with reference to the City’s Dewatering Policy and Plan Guidelines. This review will be performed by a licensed Geotechnical Engineer registered in the State of California.; 3.1 CONSULTANT will verify method of technical analysis used in the geotechnical study.; 3.2 CONSULTANT will verify calculations and assumptions; 3.3 CONSULTANT will verify results of “reasonableness” of anticipated flowrate, drawdown, and the determination of potential impacts.; 3.4 CONSULTANT will review revised geotechnical study, using points 3.1 through; 3.3 above, in cases where the applicant had to stop work and perform a new study due to inconsistency between actual flow meter data in the field and anticipated flowrate state in the original geotechnical study.; 3.5 CONSULTANT will provide the City with detailed review comments to bring the Geotechnical Engineering Report in compliance with City requirements.
