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a Beacon Station No 3641 October 30, 2000 <br /> Stockton California Quarterly Groundwater Monitoring Re ort <br /> - Concentrations of the fuel oxygenates DIPE and ETBE were not detected in any of the <br /> groundwater samples this quarter With the exception of monitoring wells MW-3 and MW- <br /> 8, MTBE concentrations were reported in groundwater samples at concentrations ranging <br /> 2 7 to 16,000 ppb Reported concentrations of MTBE have increased in groundwater <br /> samples from monitoring wells MW-1, MW-2, MW-3, MW-7, vapor extraction well VW-1, <br /> and sparge well SW-1 compared to June 2000 Concentrations of TBA were detected in all <br /> groundwater samples except from monitoring well MW-3 at concentrations ranging from <br /> 6 0 to 380 ppb Concentrations of 0 71 and 2 2 ppb TAME were reported in groundwater <br /> samples from monitoring wells MW-2 and MW-4, respectively An EDC concentration of <br /> 1 3 ppb was reported in groundwater from monitoring well MW-2 No EDB was reported in <br /> any groundwater sample <br /> Recommendations <br /> Horizon recommends quarterly monitoring and evaluation of groundwater quality trends <br /> continue concurrently with development of a Problem Assessment Report and Corrective <br /> Action Plan as recommended in the Horizon document Results of Additional Subsurface <br /> Investigation dated June 15, 2000 <br /> Distribution <br /> A copy of this report should be forwarded to <br /> Mr Michael Infurna Jr , R E H S <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third FIoor <br /> P O Box 388 <br /> Stockton, California 95201-0388 <br /> Mr Gordon Boggs <br /> Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> 10 <br /> 641gmr00Q3 doc <br /> 164143 3 HORIZON ENVIRONMENTAL INC <br />