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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 <br /> (BTEX) Total BTEX ranged from 26 micrograms per liter (ug/L), or parts per billion (ppb) in the sample <br /> from well MW-4 to 77,000 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 fuel were not observed above the detection limit of 10 ug/L in any <br /> of the samples Because diesel fuel has not been 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 from well MW-1 at 33 ug/L The laboratory noted that the <br /> sample from MW-1 contained sediment Previous analytical results indicated total lead ranging from 11 to <br /> 28 ug/L Because the only sample in 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 lead rather than total lead <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 Soil and Groundwater Investigation at Manna Pro, Inc Facility, <br /> dated December 1990, prepared by ERM-West, Inc <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 /> GROUND TTERCNOLOGY, INC <br /> aRichar M T11 <br /> Hydrogeolog <br /> Project Manager <br /> I -0? so G <br /> avid R Kleesattel OC <br /> Registered Geologist <br /> No 5136 DAVID R KLEESATIa <br /> H0.5136 <br /> Attachments 9T�OF C0Q <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 <br /> MPQUAR 2 <br /> Ll GROUNDWATER <br /> TECHNOLOGY, INC <br /> r <br />