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*PUBLIC*`HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officerq.,. <br /> CfFop <br /> 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-0388 <br /> (209) 468-3420 <br /> JOHN STROH O <br /> SAN JOAQUIN COUNTY Lr <br /> MOSQUITO ABATEMENT DISTRICT <br /> 5503 S AIRPORT WAY <br /> STOCKTON CA 95206 JUN 16 1994 <br /> RE: San Joaquin County <br /> Mosquito Abatement District Site Code: 1849 <br /> 200 N. Beckman <br /> Lodi, CA 95266 <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has reviewed the "Workplan for Soil Boring <br /> Installation and Groundwater Sampling and Analysis", submitted by <br /> Roy F. Weston, Inc. and has these comments in addition to the <br /> Feb. 28, 1994 letter submitted to John Stroh from PHS/EHD. <br /> -It was agreed that hydropunch borings through existing dry <br /> monitoring wells would be grouted from the bottom to the top <br /> of the existing well with bentonite chips. California split <br /> spoon sampling method should be used in sampling beneath the <br /> dry monitoring wells. The samples of soil within the split <br /> spoon should be field observed for logging and possible <br /> submission to laboratory for confirmation sampling. Soil <br /> borings will be grouted with a 5% bentonite/cement mixture. <br /> -A site specific gradient needs to be determined. The <br /> gradient has been assumed to be to the northeast from 1987 <br /> neasurements. Since monitoring wells 2 and 3 have been dry <br /> since at least December 1991, the gradient has not been <br /> confirmed. PHS/EHD research reveals nearby sites including <br /> Guild Winery on Winemaster Way (Gradient-South to Southwest) <br /> and Roberts Petroleum on 930 Victor RD. (Gradient fluctuates) <br /> -The consultant should conduct research in order to verify a <br /> site specific gradient. <br /> -Additional investigation may be necessary after review of the <br /> results of the next report. <br /> A DiN ision of San Joaquin County Health Care Services <br />