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Langstonr s Market <br /> 1561 S Seventh Street; Lathrop, California <br /> Quarterly Groundwater Sampling Report <br /> September, 1997 <br /> Narrative <br />' On September 24, 1997, WHF, Inc , in conjunction with HKM Environmental, Inc , <br /> conducted field measurements, well pumping and groundwater sampling on four (4) <br /> groundwater monitoring wells located at this site (Figures 1 & 2) <br /> IGroundwater elevations were taken from four (4) wells prior to pumping (Table 1 & <br /> Appendix B) Monitoring wells EW-1, also referred to as MW-1, MW-2 through MW-4 <br />' were evacuated by means of a steam-cleaned, stainless steel bladder type pump During <br /> the three (3) volume pump down samples were collected to measure field pH, electrical <br /> conductivity and temperature (Table 3 & Appendix B) A minimum of three (3) well <br /> volumes were removed and the samples were collected with a steam-cleaned disposable <br /> bailer The samples were then labeled and placed in an ice chest cooled with Blue Ice® <br /> IThe samples and trip blank were then logged on a Chain of Custody (Appendix A) and <br /> transported to a State-certified laboratory, California Laboratory Services, Inc , in Rancho <br />' Cordova, California The analysis requested for the water samples was EPA method 602 <br /> for BTX&E and EPA method 5030/LUFT for gasoline The analytes and concentrations <br /> detected are listed in Table 2 of this report <br /> Groundwater Gradient <br />' The water level measurements from three (3) of the four (4) monitoring wells, MW-2, 3 <br /> and 4, were used to construct a groundwater gradient map and calculate the gradient <br />' (Figure 3) EW-1 was not used in the gradient calculation nor the construction of the <br /> groundwater gradient map The current gradient is 0 00309 ft/ft to the N40°E direction <br /> Historical gradient maps are included in Appendix C <br /> r <br />