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J. H, KLEINFELUER &ASSOCIATES <br /> pack. The sediment laden water was air lifted from the well. Each well <br /> was developed until the discharge water ran relatively clear of fines. <br /> After the wells were developed, the aquifer was allowed to stabilize for a <br /> minimum of 3 days prior to :sampling. <br /> On 9 June 1987, and 10 June 1987, each monitoring well was purged and <br /> sampled with an YSCO bladder pump. During the purging of the wells, field <br /> parameters (pH, conductivity, and temperature) were monitored. After the <br /> field parameters for each well stabilized, indicating representative <br /> formation water, a sample was collected. The sample bottles were <br /> immediately sealed, labeled, and placed ?.n an iced cooler for temporary <br /> storage. At the end of the day, the water samples were delivered to the <br /> laboratory at a temperature of 40C, under chain-of-custody control. To <br /> prevent cross-contamination, all development and sampling equipment was <br /> p <br /> steam-cleaned prior to its use in each monitoring well. Additionally, a <br /> phosphate free detergent solution and clean water was pumped through the <br /> sampling equipment prior to the collection of subsequent, water samples. <br /> A ground water chemistry summary for the recently collected samples has <br /> i been prepared and indicates the ground water below the project property <br /> has variable concentrations of hydrocarbon compounds depending on the <br /> sampling location (refer to Table 3, Appendix A). Available laboratory <br /> data (soils and ground water) including methods of analysis and detection <br /> limits are included within Appendix E. A series of ground water iso--chem <br /> maps have been prepared from the available laboratory analytics to <br /> illustrate . the occurrence and distribution of gasoline and related <br /> compounds within the ground water. Figures 14 through 20 show the <br /> distribution and occurrence of contaminants using contour lines of equal <br /> - i <br /> concentration in an areal view. f <br /> Chemicals found in the ground water are predominately gasoline and <br /> gasoline-related compounds including benzene, toluene and xylene.. <br /> Although low concentrations of methylene chloride have been found in soils <br /> of the vadose zone:, methylene chloride has not been detected within the <br /> ground water. Concentrations of 1-2-dichloroethane, ranging from 2,500 <br /> ppb (Ifk•1) to 0 ppb (M--5) have been measured in ground water samples. A <br /> 53-87-443 28 <br />