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Teiehert Sep 94' MR <br /> 1.0 INTRODUCTION AND BACKGROUND INFORMATION <br /> 1.1 Scope of Work <br /> This report presents the results of quarterly groundwater monitoring by BCR & Associates, Ltd , <br /> (BCR) at the A Teichert& Son, Inc Mobile Equipment Shop located in Stockton, California This <br /> work was completed on September 19, 1994 under contract to Ramos Environmental Engineering, <br /> of West Sacramento, California The following scope of work was completed according to the BCR <br /> standard procedures included in Appendix A <br /> 1 > Depth to groundwater was measured in six wells, MW-9 through MW-14 <br /> 9 Five wells, MW-10, MW-11, MW-12, MW-13 and MW-14 were purged and <br /> sampled <br /> A sixth water sample was collected from well MW-9 This well is obstructed, <br /> rendering conventional purging untenable This sample constitutes a "grab sample", <br /> as the well was not purged, and provides an indication of formation/aquifer water <br /> quality in this immediate area <br /> Groundwater samples Y am les were submitted b BCR for Ramos to Sparger Technology, <br /> Inc a State-C'ertified analytical laboratory located in Sacramento, Calnforma for <br /> analysis of total petroleum hydrocarbons (TPH) as gasoline and the prugeable <br /> aromatic compounds benzene, toluene, ethyl benzene and xylenes (B TEX) <br /> i <br /> Eight existing monitoring wells, including vapor extraction well MW-14 were <br /> surveyed by Yolo Engineers, of Woodland California <br /> 1> Groundwater level measurements were evaluated and the results triangulated to <br /> determine hydraulic gradient and direction beneath the site <br /> 1.2 Previous Work <br /> Previous work at the site completed by other parties since 1986 has removed gasoline, diesel, and <br /> waste oil underground storage tanks Samples from the UST excavations indicated elevated <br /> concentrations of petroleum hydrocarbons Prior to soil excavation from the former UST and piping <br /> areas, numerous soil borings were advanced and sampled to evaluate the horizontal and vertical <br /> extent of product release Monitoring wells MW-1 through MW-13 were constructed and sampled <br /> Well MW-14 was constructed and sampled in February, 1994 The well was designed to serve as <br /> Page 1 <br />