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Y <br /> II '1'17 <br /> WESTERN GED-ENGINEERS <br /> SECTION 5.3 <br /> WELL DEVELOPMENT <br /> Following well completion, each well was developed to remove fine grained <br /> material and to improve hydraulic conductivity with the formation. The initial <br /> development occurred on May 7, 1988. Prior to development water <br /> measurements were conducted for each well. The wells were then developed in <br /> order of the cleanest to dirtiest as indicated by vapor measurement during the <br /> exploratory borings (2, 3 and i respectively). Each well was first swabbed In six <br /> foot intervals starting at the base (29-23' casing depth, 23-17' casing depth, then <br /> _. the 17-11' casing depth) and working the swabbing tool up the screen until all of it <br /> had been swabbed. Immediately after swabbing the well a 1 114" diameter hose <br /> was placed Into the well near the bottom of the screen and water was pumped <br /> from the wells, using a centrifugal pump, until clear water appeared. The water was <br /> i pumped into 55 gallon drums which were to be held on site until laboratory <br /> results indicated disposal procedure. After pumping approximately 50 gallons of <br /> water from each .well it was apparent that more development was needed (one <br /> casing volume is approximately 3 gallons and well volume (sand pack plus casing) is <br /> 1 <br /> approximately 21 gallons). <br /> tf; Arrangement was made with San Joaquin County Health Dept. and the City of <br /> Tracy Fire Marshall for the placement of a 5000 gallon open tank on the site for <br /> holding all water produced by the well development prier to disposal. The tank <br /> was delivered on May 10, 1988 and final development of the wells occurred at that <br /> s time using the above stated procedures. The water collected in 55 gallon <br /> drums from development on May 7 was transferred to the holding tank at that <br /> time. <br /> SECTION 5.4 <br /> SURVEYING <br /> Prior to well development water level measurements were obtained from each well, <br /> and the top of the casings surveyed for elevations. The Datum for elevations is the <br /> r approximate location of the 50 foot contour taken from U.S.G.S, topo map of the <br /> Tracy Ouad. photorevised 1981. Once traffic boxes are installed (to protect the <br /> } monitor wells) this same Datum will be used to re- survey the new top of casing <br /> elevations. <br /> page 17 <br />