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1 <br /> Canepa's Car Wash <br />' 248 E Park Street, Stockton, California <br /> aka: 642 N Hunter Street <br /> IQuarterly Groundwater Sampling Report <br /> September, 1994 <br /> INarrative <br /> On September 22 1994 WHA <br /> p Environmental Consultants, Inc , in conjunction with HKM <br /> I Groundwater, conducted field measurements, well pumping and groundwater sampling on <br /> seven (7)groundwater monitoring wells located at this site (Figure 2) <br /> Groundwater elevations were taken from seven (7) wells prior to pumping (Table 1 & <br /> Appendix B) Monitoring wells MW-1 through MW-7 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 /> (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 to the State certified laboratory, California Laboratory <br /> Services, in Rancho Cordova, California The analysis requested for the water samples <br /> was EPA method 602 for BTX&E and EPA method GCFID (5030/8015) for gasoline <br /> 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 to calculate the gradient (Figure 3) The gradient has not <br /> changed significantly since 5/25/94, and remains variable from 0 003 to 0 022 ft/ft The <br /> water table has risen an average of 1'/z feet Historical gradient maps are included as <br /> Appendix C <br /> I <br />