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1 <br /> Langston Is Market <br /> 15617 Seventh Street; Lathrop, California <br />' Quarterly Groundwater Sampling Report <br /> March, 1995 <br /> 1 <br />` Narrative <br /> I On March 30, 1995, VVHF Environmental Consultants, Inc, in conjunction with HKM <br /> Groundwater Monitoring, conducted field measurements, well pumping and groundwater <br /> sampling on four(4) groundwater monitoring wells located at this site (Figures 1 & 2) <br /> Groundwater elevations were taken from four (4) wells pnor to pumping (Table 1 & <br /> / <br /> � Appendix B) Monitoring wells MW-1 through MW-4 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 aclueved, a misumu n of three <br /> �4 (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 Inc , in Rancho Cordova, Cahforrna The analysis requested for the water <br /> samples was EPA method 602 for BTX&E and EPA method 5030/LUFT for gasoline <br /> The analytes and concentrations detected are listed in Table 2 of this report <br /> Groundwater Gradient <br /> The water level measuremen s from the monitoring wells were used to construct a <br /> groundwater gra ent map a d calculate the gradient (Figure 3) The current gradient <br /> averaged 0 0014 ft/ft to the S85°E direction Histoncal gradient maps are included in <br /> Appendix C <br /> Summary of Anal tical Findin s y g <br /> IAll four (4) groundwater monitoring wells had varying amounts of contamination as <br /> BTEX and Gasoline <br />