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4uarterIV Monitoring Report, November 1993 <br /> A.7eichert & Sons, 103 North E St, Stockton. CA. <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 & Sons, 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 /> o Depth to groundwater was measured in five wells <br /> o The wells were purged and sampled <br /> 1 <br /> o Groundwater samples were submitted to Sparger Technology, Inc. a <br /> State - Certified analytical laboratory located in Sacramento, California <br /> for analysis of total petroleum hydrocarbons (TPH) as gasoline and <br /> benzene, toluene, ethylbenzene and xylenes (BTEX). <br />>i <br /> o Groundwater level measurements were evaluated and the results <br /> triangulated to determine hydraulic gradient and direction beneath the <br /> site. <br /> s <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 tosoil <br /> 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. One of these wells is obstructed and sample collection <br /> is infeasible. Historical results of groundwater sampling from the four wells indicates <br /> that detectable concentrations of petroleum hydrocarbons have occurred in wells <br /> MW-10, MW-1 1 and MW-13. Historical water level measurements from the five wells <br /> indicates that groundwater flow is to the northeast, east or south east. Results of <br /> previous groundwater measurements and sampling are summarized in Tables 1 and <br /> 2. <br /> Page 1 <br />