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H <br /> A Tach[6 Sm.Inc <br /> Rb 94 OKA <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 & <br /> Associates, Ltd., (BCR) at the A. Teichert & Son, Inc. Mobile Equipment Shop located <br /> in Stockton, California. This work was completed under contract to Ramos <br /> Environmental Engineering, of West Sacramento, California. The following scope of <br /> work was completed according to the BCR standard procedures included in Appendix <br /> A. <br /> Depth to groundwater was measured in five wells, MW-9 through MW- <br /> 13. <br /> Four wells, MW-10, MW-11 , MW-12 and MW-13 were purged and <br /> sampled. <br /> Groundwater samples were submitted to Sparger Technology, Inc. a <br /> State-Certified analytical laboratory located in Sacramento, California for <br />�• analysis of total petroleum hydrocarbons (TPH) as gasoline and benzene, <br /> toluene, ethyl benzene and xylenes (BTEX). <br /> Groundwater level measurements were evaluated and the results <br /> triangulated to determine hydraulic gradient and direction beneath the <br /> site. <br /> 1.2 Previous Work <br /> Previous work at the site completed by other parties since 1986 has removed <br /> gasoline, diesel, and waste oil underground storage tanks. Samples from the UST <br /> excavations indicated elevated concentrations of petroleum hydrocarbons. Prior to <br /> soil excavation from the former UST and piping areas, numerous soil borings were <br /> advanced and sampled to evaluate the horizontal and vertical extent of product <br /> release. Monitoring wells MW-1 through MW-13 were constructed and sampled. A <br /> drop in the water table beneath the site has resulted in five remaining wells <br /> intersecting the water table. MW-9 is obstructed and sample collection is infeasible. <br /> Historical results of groundwater sampling from the four wells indicated that <br /> detectable concentrations of petroleum hydrocarbons have occurred in wells MW-10 <br />�i <br /> 1 <br />