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'5ggo'. a 'Y s <br /> r� <br /> than 01 mg/k <br /> found at 0.06 ug/ml and total lead was less . gn• <br /> The water samples taken from - <br /> 4 and MW-3 also <br /> had <br /> toluene, xylene, total gasoline <br /> concentrations above the detection limits for the parameters <br /> tested including benzene, see Appendix C) • <br /> hydrocarbons, EDB and total lead t <br /> Iv. corrcLuszoNs <br /> on <br /> the sampling <br /> Based efforts and the chemical analysis <br /> the area below and adjacent to the abovetank <br /> theremoval <br /> results, detection <br /> has fuel related compounds significantly <br /> limits for the cal areas teste7-4) containedsoil <br /> highersamples <br /> concentrations <br /> the tank removal area (` -4� the removal area. The condition <br /> than other borings surrounding he eared to be <br /> of the 700 gasoline tank iremoved fromBasedt. sanethcpcondition of <br /> old and contained analytical many results of the soils beneath <br /> ait, <br /> w e <br /> the tank and the analy p tank may have <br /> conclude that the underground storag • <br /> releases of product into the soil' <br /> groundwater contained in the uppermost aquifer, at an <br /> The g also contained appreciable <br /> average depth of 13 to 14 feet, The largest concentrations <br /> MW-2- <br /> amounts of fu received <br /> compounds. and subsequent <br /> in water were received in monitoring wells MW-1 and �-2• <br /> These two wells, from the well elevatiaresuG surveyand <br /> to be <br /> groundwater surface measurements, groundwater <br /> groundwater <br /> ient from the tank removal area. That is, <br /> , .� the possibility <br /> flow according <br /> the northwest- <br /> Thereforwe have e date, is from e <br /> southeast ;s an off-site source moving through <br /> exists . that there site, There could <br /> groundwater onto the Manteca Bean Company due to shallow <br /> r also be complicated groundwater flow variations duo to seasonal <br /> changes or local pumping or recharge of the uppermost <br /> water-bearing zone. Additional data is needed to make .a <br /> determination of groundwater flow parameters in the area. <br /> V. RF <br /> CpMMENDAI'IONS <br /> F te the approximate extent of aa <br /> in order to evaluaare <br /> , compounds on the Manteca Bean Co. site, the following <br /> fuel-related <br /> proposed: in hexisting <br /> wells once a week <br /> 1. Monitor the <br /> erlevels <br /> weekstoestablish a more precise <br /> for a p fiBroundwater flow gradient and direction <br /> indication of the g <br /> beneath the site. better <br /> 2, Install four additional borings/wells to ether <br /> characterize the extent of contamiationgroundwater g flow <br /> additional data concerning <br /> 4 <br /> IM IN111 mill <br /> a� <br />