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y <br /> r <br /> DeBoer Truck Lines, Inco <br /> - 201 West 5th Street, Ripon, California <br /> Quarter y Groundwater Sampling.Report <br /> September, 1995 <br /> 9 <br /> i <br /> I <br /> I <br /> r I <br /> 0 <br /> Narrative � <br /> On September 29, 1995, WIiF Environmental Consultants, Inc., in conjunction with HKM ' <br /> Groundwater Monitoring, conducted field measurements, well pumping and groundwater t <br /> sampling on three (3) groundwater monitoring wells located at this site (Figures 1 & 2). <br /> Groundwater elevations were taleen from three (3) wells prior to pumping (Table 1 & <br /> Appendix B). Monitoring wells MW-1, MW-2, and MW-3 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 H, electrical conductivity and <br /> P P Y <br /> temperature (Table 3 & Appendix B). Once stability was achieved, a minimum of three <br /> (3) well volumes were removed and samples were collected i6th a steam-cleaned <br /> disposable bailer. Th: samples were then labeled and placed in an ice chest with Blue!! <br /> r-- Ice& <br /> The samples, bailer blanks and trip blank were then logged on a Chain of Custody <br /> (Appendix A) and transported to a State-certified- Laboratory, California Laboratory <br /> Services, Inc., in Rancho Cordova, California. :The analysis requested for the water!1 <br /> samples was EPA method 602 for BTX&E and EPA method 8015/3510 for diesel. The II . <br /> analytes and concentrations detected are listed in Table 2 of this report. it <br /> Groundwater Gradient <br /> The water level measurements from the monitoring wells were used to construct a I <br /> groundwater gradient map and calculate the gradient (Figure 3). The current gradient is l <br /> 0.0066 ft/ft at N35°E. Histogcal gradient reaps are included in Appendix C. ' <br /> i <br /> �- it <br />