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identification number. Monitoring wells shall be assigned the <br /> identification numbers as indicated on the drawings. <br /> 3.3.10 Well Development <br /> A. Within 7 days of completion of each well,but no sooner than 48 hours <br /> after cement grouting is completed, the well shall be developed. <br /> Development shall be performed using only mechanical surging or over <br /> pumping or a combination thereof per ASTM D 5521. A well <br /> development record shall be maintained. Development is complete when: <br /> 1. Well water is clear to the unaided eye, <br /> 2. Sediment thickness in the well is less than 0.1 foot, <br /> 3. A minimum of three times the standing water volume in the well plus <br /> three times the volume of all added water and drilling fluid lost during <br /> drilling and installation of the well is removed, and <br /> 4. Temperature, specific conductivity,pH,oxidation-reduction potential <br /> (ORP),dissolved oxygen (DO), and turbidity readings,measured <br /> before,twice during and after development operations,have stabilized. <br /> Stabilization shall mean variation of less than 0.2 pH units, variation <br /> of± I degree Fahrenheit,±3 percent change in specific conductance; <br /> ± 10mV for ORP; and± 10 percent for DO, and turbidity,measured <br /> between three consecutive readings with one casing volume of water <br /> removed between each reading. <br /> 3.04 SURVEYS <br /> A. Coordinates and elevations shall be established for each monitoring well <br /> in both local grid coordinates and in accordance with State of California <br /> Electronic Submittal of Information requirements for the Geotracker data <br /> base system (more information on Geotracker requirements may be <br /> obtained from the California State Water Resources Control Board at <br /> www.waterboards.ca.gov/ust/cleanup/electronic_reporting/index.html). <br /> Horizontal coordinates (latitude and longitude) shall be measured in <br /> decimal degrees,and reported to seven decimal points. Horizontal <br /> coordinates shall be determined with Third Order methods using a <br /> minimum of two reference points: California Spatial Reference System- <br /> Horizontal (CSRS-H) or two horizontal geodetic control points derived <br /> from the CSRS-H and must be determined from the NAD 83 datum. <br /> Elevation shall be surveyed using the NAVD88 datum. The relative <br /> elevations of locations on the site (intersite well elevations) are to be <br /> measured within 0.01 ft. The accuracy of the absolute elevation (tied to <br /> Foothill Landfill Site Improvement Project 9 GROUNDWATER MONITORING WELLS <br /> San Joaquin County Public Works Section 02522 <br />