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Can epa is Car Wash <br /> 6230 Paces Avenue, Stockton, California <br />' Quarterly Groundwater SamplingReport <br /> June, 1994 <br /> Narrative <br /> On June 17, 1994, WHF Environmental Consultants, Inc , in conjunction with F KM, Inc , <br /> conducted field measurements, well pumping and groundwater sampling on eight (8) <br />' groundwater monitoring wells located at this site (Figure 2) <br /> Groundwater elevations were taken from eight (8) wells prior to pumping (Table 1 & <br />' Appendix B) Monitoring wells MW-1 through MW-8 were evacuated by means of a <br /> steam-cleaned, stainless steel bladder type pump During the three (3) volume pump <br /> down of each well, samples were collected to measure field pH, electrical conductivity and <br /> temperature (Table 3 & Appendix B) Once stability was achieved, a minimum of three <br /> lei (3) well volumes were removed and samples were collected with a steam-cleaned <br /> disposable bailer The samples were then labeled and placed in an ice chest cooled with <br /> blue ice <br /> The samples, bailer blanks and trip blank were then logged on a Chain of Custody <br /> (Appendix A) and transported via Greyhound Package Express to the State certified <br /> laboratory, GeoMomtor, Inc , in Hesperia, California The analysis requested for the <br /> water samples was EPA method 602 for BTX&E and EPA method GCFID (5030/8015) <br /> Ifor gasoline The analytes and concentrations detected are listed in Table 2 of this report <br /> Groundwater Gradient <br /> The water level measurements from the monitoring wells were used to construct a <br /> groundwater gradient map and calculate the gradient (Figure 3) Water levels rose <br /> between 0 24 and 0 66 feet, averaging 0 42 feet across the site In the area of MW-3, 4 & <br /> 5, the water level rose an average of 0 61 feet This accounts for the elongation of the <br /> mound to the north It is suspected that there is water entering the ground in the vncnmty <br /> of the car wash building Testing is in progress to attempt to locate the source, of this is <br /> the case No data has been compiled to date Histoncal gradient maps are included in <br /> Appendix C <br /> i <br />