Laserfiche WebLink
Langston 's Market <br /> 15617 Seventh Streets Lathrop, California <br />.- Quarterly Groundwater Sampling Report <br />— Septemher, 1994 <br /> Narrative <br /> r On September 30, 1994, WBF Environmental Consultants, Inc , in conjunction with E KM <br /> Groundwater, conducted field measurements, well pumping and groundwater sampling on <br /> four (4) groundwater monitoring wells located at this site(Figures I & 2) <br /> Groundwater elevations were taken from four (4) wells prior to pumping (Table 1 & <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 /> ro down of each well, samples were collected to measure field pK 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 to blank were then logged on a Cham of Custody <br /> P � <br /> (Appendix A) and transported to the State certified laboratory, GeoAnalytical <br /> Laboratories, Inc , in Modesto, California The analysis requested for the water samples <br /> was EFA method 602 for BTX&E and EPA method 50301LUFT for gasoline The <br /> 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) The current gradient is <br /> 0 001 $!ft to the 5271E direction. A historical gradient map is included in Appendix C <br /> Summary of Analytical Windings <br /> All four (4) groundwater monitoring wells had varying amounts of contamination as <br /> BTEX and Gasoline <br />