Laserfiche WebLink
{ <br /> City of Stockton �{ TL# 394-0192-01 <br /> September 16, 1994 Page 11 <br /> I <br /> E <br /> emplaced through the hollow-stem augers; which will extend to <br /> within 15 feet of the bentonite seal. Iif required by the local <br /> regulatory agency, the seal will be emplaced by pumping through a <br /> tremie pipe which extends to within 15 feet of the bottom of the <br /> boring. The tremie pipe or augers are withdrawn from the boring in <br /> 5-foot increments as the boring fills with grout. A watertight <br /> a well cap will be placed on top of each groundwater monitoring well, <br /> and a 3-foot steel standpipe with locking ;cover or a traffic-rated <br /> ' box will be installed around the wellhead'. Monitoring wells will <br /> I` <br /> be locked to restrict access to unauthorized personnel. <br /> Monitoring well construction details will �be recorded on the field <br /> well construction form. Construction information will be <br /> transferred to Monitoring Well construction schematics for <br /> presentation in final reports. �# <br /> A-3 Groundwater Monitoring Well Development: ,� When possible, <br /> initial well development will be performed during installation of <br /> the sand pack. A minimum of 48 hoursJ�foliowing installation, <br /> groundwater monitoring wells will be developed in order to remove <br /> sediment that may accumulate in the well during installation, and <br /> to settle the filter pack. Groundwater monitoring well development <br /> will be performed using a combination of bailing, pumping, and <br /> surging. �' <br /> The development of each groundwater monitoLing well will continue <br /> until a minimum of five well casing volumes of water have been <br /> removed, and the displaced water is relatively clear, free of <br /> sediment, and the values of pH, tem--perature, and specific <br /> electrical conductance (EC) have stabilized. Well development data <br /> will be recorded on the Sampling/Well Development Log (Attachment <br /> A) . <br /> I <br /> Purged water will be containerized in Depar�tmen't of Transportation- <br /> approved drums, and stored on site in an area: inaccessible to the <br /> general public. The purged water is typica'11y characterized either <br /> by sampling it, or on the basis of the . groundwater sample <br /> analytical results. Twining can recommend an appropriate method <br /> for disposition of the purged water. ;1 Disposal will be the <br /> responsibility of the client. . <br /> A-4 Measuring Depths to Water and Calculating Groundwater <br /> Elevations: Monitoring well locations and .top-of-casing elevations <br /> will be surveyed by a Calif ornia-licensed ;landisurveyor. Surveyed <br /> data will be referenced to a local benchmark, an assumed local <br /> datum, or a United States Geological Survey benchmark. The <br /> surveyed data will be accurate to + 0. 01 feet: <br /> a <br /> Depth to groundwater will be measured relitive'� to a surveyed point <br /> on the north edge of the well casing rim. I'The water depths will be <br /> 1 <br /> �I �� <br />