COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

3.03 WELL DEVELOPMENT A. Prior to development, the Contractor shall allow a minimum 48 hours for the neat cement to set. B. Contractor shall develop groundwater wells within 7 days of completion of the well. C. Well development shall occur in the presence of the Engineer. D. Contractor shall not damage the well casing during well development. E. Contractor shall remove any tools or other parts dropped in the well casing. F. Contractor shall allow the Engineer access to measure depth to groundwater in the monitoring well during well development. G. Contractor shall obtain and maintain a multi-parameter water quality meter on site for development which can record measurements for pH, specific conductance, turbidity, DO, oxidation / reduction potential (ORP), and temperature. H. Contractor shall develop well using mechanical surging or over pumping or a combination thereof per ASTM D 5521. Contractor shall purge the well until: 1. Well water is clear to the unaided eye. 2. Sediment in the well casing is less than 0.1 foot thick. 3. Water removed during surging and purging shall be a minimum of three times the water volume in the well prior to the start of purging plus three times the volume of water added for purging and surging. 4. Temperature is consistent within 0.2 deg F, 5. Specific conductivity is consistent within ± 3 percent change in specific conductance. 6. pH varies less than 0.2 pH units 7. Turbidity varies not more than 10%. The turbidity goal shall be less than 5 Nephelometric Turbidity Units (NTU). 3.04 WELL DEVELOPMENT RECORDS A. Contractor shall submit to the Engineer in the writing the following data for each well development. Submittal shall be made within two business days of completing well development. Engineer may request additional data in the field. North County G-15&G-16 San Joaquin County Groundwater Monitoring Well Specifications 10 Public Works Dept Solid Waste Division