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Manna Pro Stockton 3 <br /> Quarterly Groundwater Monitoring Report <br /> April 1992 <br /> Aromatic volatile organics analyzed for and detected included benzene,toluene,ethylbenzene and xylenes j <br /> (STEX). Total BTEX ranged from 26 micrograms per liter(ug/L),or parts per billion (ppb) In the sample <br /> from well NVY-4 to 77,oco ug/L In the sample from well MW-1. Total petroleum hydrocarbons(TPH) as <br /> gasoline similarly ranged from 130 ug/L In MW-4 to 150,000 ug/L in MW-1. <br /> Total petroleum hydrocarbons as diesel tuel w,re not observed above the detection limit of 10 ug/L in any <br /> of the samples. Because diesel fuel has nat i-,een detected for two consecutive quarters of groundwater <br /> monitoring and sampling,we recommend no further TPH-as-diesel fuel analyses be performed. <br /> Total lead was only detected In the sample frorn well hAW-1 at 33 ug/L. The laboratory noted that the <br /> sample from MW-1 contained sediment. PreL?ous analytical results Indicated total lead ranging from 11 to <br /> 28ug/L.. Because the only sample ir,which lead was detected this quarter contained sediment,the detected <br /> lead may be related to the sediment, rather than dissolved in groundwater. It Is recommended that <br /> subsequent analyses for lead be total dissolved !ead rather than total lead. <br /> Figure 2 graphically illustrates the TPH a.;gasoline anelyticai results presented in Table 3. The results are <br /> generally sim€lar to previous Interpretations regarding the extent of petroleum hydrocarbon Impact to <br /> groundwater. Previous data is presented in Soil and Qroundwater Investioatign at Manna rInc.Fagility <br /> dated December 1990,prepared by ERM-West, !nc.. <br /> We trust this sport 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 /> GROUND TER riCHNOLOGY, INC. <br /> 11char M.Trjom er <br /> ! <br /> Hydrogeolcglsv—j <br /> Project Manager <br /> 1 -J' _ <br /> l avid R.Kleesattel <br /> Registered Geologist C� <br /> No.5136 DAVID R KLE MATTEL <br /> N(L 5138 <br /> Attachments <br /> OF CAt-�Fo� <br /> cc: E.Thayer,California Regional Water Quality Control Board-Central Valley Region <br /> Larry Chapman,Manna Pro <br /> _. Dean Willis,O'Melveney-and Myers-- - _w--- -- <br /> . ., r MPOUAR.2 - - <br /> 5_ GROUNdWAMR <br /> TFCHNOLOGY J <br /> hvc. <br /> �r�arr� <br />