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Manna Pro Stockton 3 <br /> Quarterly Groundwater Monitoring Report <br /> January 1992 <br /> Aromatic volatile organics detected included benzene, toluene, ethylbenzene and xylenes (BTEX) Total <br /> BTEX 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 110 ug/L in MW-4 to <br /> 120,000 ug/L in MW-1 <br /> Total petroleum hydrocarbons as diesel fuel were not observed above the detection limit of 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 MW-4 <br /> exhibited the highest concentration of lead Since MW-4 exhibited the lowest concentration of BTEX and <br /> TPH as gasoline, but the highest lead concentrations, the concentrations of lead do not appear related to <br /> a leaded gasoline fuel impact. <br /> Figure 2 graphically illustrates the TPH as gasoline analytical results presented in Table 3 The results are <br /> generally similar to previous interpretations regarding the extent of petroleum hydrocarbon impact to <br /> groundwater Previous data Is presented in ii and Groundwater Investigation at Manna Pro. IncFaciltt <br /> dated December 1990, prepared by ERM-West, Inc <br /> I <br /> We 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 /> GROUNDWA NOLOGY, INC <br /> Richard Tho ass <br /> Hydrogeologfst p SSI <br /> Project Manager Q� f djy�f <br /> Kevin ull van ► -+ }, <br /> Professional Engineer <br /> No C46263 <br /> Rs� , <br /> CIVIL <br /> O <br /> F CALl <br /> fJ <br /> Attachments <br /> cc California Regional Water Quality Control Board - Central Valley Region <br /> Mr Lary Chapman, Manna Pro <br /> Mr Dean Willis, Q'Melveney and Myers <br /> GROUNDWATER <br /> TECHNOLOGY, INC <br />