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y9 <br /> i <br /> 2-6 <br /> r� <br /> monitored and recorded in the field notebook. The well was sampled using the same procedures <br /> previously states. <br /> .a Abandonment of Well 1 <br /> Groundwat-,r monitoring well W-1 was abandoned because the decline in the water-table <br /> elevation had caused it to become dry and no longer useful for <br /> groundwater monitoring. W-1 <br /> was abandoned by drilling out the existing casing using a 10-inch hollow-stem auger. Cement- <br /> bentonite grout was pumped into the hole using the tremie-pipe method. The grout was emplaced <br /> from the bottom up. <br /> Drill Cuttings <br /> Drill cuttings generated during the drilling of on-site boreholes and trenching activities were <br /> stockpiled on site'on visquine. Two soil samples (SPI, SP2) were collected from this stockpile <br /> and analyzed for total petroleum hydrocarbons (T P:1) as gasoline and benzene, ethylbenzene, <br /> toluene,and xylene (BETX). Drill cuttings from the drilling of the off-site boreholes were placed <br /> in 55-gallon drums. Two composite samples were collected from this soil and analyzed for T H <br /> i and BETX. <br /> Analytical results from these samples indicated that the soil contained less than 100 ppm <br /> TPH. All of this soil was taken to the Class In Anderson Landfili in Anderson, California,by <br /> Universal Engineering. <br /> Step-Drawdown Test <br /> -; <br /> -A'short=term step-drawdown pumping test. was pertormtd-on extraction.well•E-1 on <br /> g April 26,:1990. The test was conducted to better determine the hydraulic properties of the <br /> pumping zone around E-1 and to determine the rates at which E-1 could yield water. This <br /> information is required to design an efficient extraction and treatment system. <br /> The general approach to the step-drawdown test was to pump E-1 at several successively <br /> higher pumping rates and to record the drawdown for each rate, or step. The test was <br /> constrained by the following: <br /> ., 1. Limiting the pump rate so that the well would not dry up. <br /> 2. Pumping for a duration that would create a measurable response in an observation <br /> well. <br /> Two pumping steps were used in the test. The fust rate of I gallon per minute (gpm) was <br /> s maintained for 60 minutes at which the water level in E-1 had stabilized. After 60 minutes, the <br /> ,.; pump rate was stepped up to 2.31 gpm and continued for approximately 60 minutes,at which <br /> time the water level in E-I fell below th.- pump intake and the test was stopped. <br /> i . <br /> MOORE= MUM— <br /> t . <br />