Laserfiche WebLink
C <br /> J <br /> RIPONA MARKET <br /> 223 W. Washington Street, Ripon, California <br /> Vertical Groundwater Investigation <br />-� November 2003 Quarterly Groundwater Sampling Report <br /> i 1.0 PROJECT IDENTIFICATION <br /> The objective of this phase of work is to provide further definition of the vertical extent <br /> of the hydrocarbon plume in the groundwater near existing monitoring well MW-2 at the <br /> Ripona Market facility as directed by San Joaquin County Environmental Health <br /> Department in their letter dated June 18, 2003. The work included the installation of a <br /> deep, discretely screened monitoring well, targeting a permeable zone to define the <br /> vertical extent of the plume. <br /> In addition, on November 26, 2003, prior to the installation of the deep well, M.J. <br /> . Kloberdanz & Associates, in conjunction with GeoAnalytical Laboratories, Inc., <br /> conducted quarterly groundwater monitoring of the Ripona Market site at 223 W. <br /> Washington Street, Ripon, California. Quarterly monitoring activities consisted of depth <br />-_< to water measurement, well purging and water characterization, groundwater sample <br /> collection and laboratory analysis on three groundwater-monitoring wells located at this <br />^! site. The deep monitoring well, MW-4 was monitored on December 8, 2003 and included <br /> a in this report. <br /> 1.1 Site Description and History <br />; a <br /> Two underground fuel tanks were removed on February 11, 1999 by SEMCO <br /> under permit. Low levels of xylene were disclosed in laboratory soil samples <br /> collected at 13 feet in depth, primarily in the area of Tank 1 (TK-1) (Figure 2). <br /> Moderately high levels of specific oxygenated compounds were present in the <br /> stockpiled soil that had surrounded the tanks. Since no apparent contamination i <br />;• t <br /> was noted during the removal this soil was placed back into the excavation. <br /> r Table of Laboratory Sample Results (February 11, 1999 <br /> y <br /> Sample I.D. I Gasoline I Benzene I Toluene E-Benzene Xylenes 8260 <br /> r TK1-S 15' ND ND ND ND ND ND <br /> I TK1-N 13' ND ND ND ND 47 _ ND <br /> TK2-S 13' ND ND ND ND ND ND <br /> TK2-N 15' ND ND ND ND ND ND <br /> t SP-1 ND ND ND ND ND 190 mTBB, 1.200 t-B.11 F <br />�. SP-2 ND ND ND ND ND ND <br /> ND=Non Detect Gasoline in mg/Kg 8260 inµg/Kg <br /> F <br />