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s : — <br /> y <br /> Manna Pro Stockton 3 <br /> Quarterly Groundwater Monitoring Report <br /> ,January 1992 <br /> Aromatic volatile organics detected included benzene,toluene, ethyibenzene and xylenes (BTS. Total <br /> BT6X ranged from 11 micrograms per liter(ug/L),or parts per billion(ppb)In well MW-4 to 78,000 ug/L In <br /> well MW-1. Total petroleum hydrocarbons (TPH)as gasoline similarly ranged from 1 W ug/L In MW-4 to <br /> 120,000 ug/L In MW-1. <br /> Taal petroleum hydrocarbons as diesel fuel were not observed above the detection limit or 10 ug/L In any <br /> of the samples. <br /> Total lead ranged from 11 to 28 ug/L. Well MW-6 exhibited the lowest concentration of lead and MWA <br /> exhibited the highest concentration of lead. Since MW-4 exhibited the lowest concentration of BTIX and <br /> TPH as gasoline,but the highest lead concentrations,the concentrations of lead do not appoar related to <br /> a leaded gasoline fuel Impact <br /> Figure 2 graphically Illustrates the TPH as gasolins analytical results presented In Table 3. The results are <br /> generally similar to previous Interpretatlons regarding the extent of petroleum hydrocarbon Impact to <br /> groundwater. Previous data Is presented In Soil and GrgLindwMerI <br /> dated December 1990,prepared by ERM-West,Inc.. <br /> Vie trust this report meets your needs at this time. If you have any questions or comments, please call <br /> either of the undersigned at(510)671-2387. <br /> Sincerely, <br /> GROUNOWA NOLOGY, INC. <br /> ljch <br /> Hydrogeologist <br /> Project Manage pR�� SSl�N9 <br /> Kevin ullivan LU -1 <br /> Professional Engineer <br /> No.0462.53 �Y <br /> l9 CIVIL =�t <br /> xFGF CALIk"�`�a <br /> Attachments <br /> cc: California Reglonal Water Quality Control Board-Central Valley Region <br /> Mr.Larry Chapman,Manna Pro <br /> Mr.Dean Willis,O'Melveney and Myers <br /> r <br /> GROUNDWATER <br /> m. TEcHwLOGY,INc. <br />