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. f' <br /> A <br /> February 23, 1994 <br /> 92-1177102 34 <br /> Norcal Waste Systems, Inc. <br /> Attention: Mr Larry Sweetser, Director of Regulatory Affairs <br /> Subject- GROUNDWATER MONITORING <br /> RESULTS - November 1993 and January 1994 <br /> Stockton Scavenger Association <br /> Stockton, California <br /> Page 2 <br /> Groundwater Monrtonng <br /> In January 1994, the groundwater monitoring program was re-in ed to evaluate <br /> the effectiveness of the groundwater remediation program Subsequent ng events are <br /> scheduled for March, June, and September with qu y orts to follow 45 days <br /> thereafter This report satisfies the Fust Qu er of 1994 r irements <br /> For this 1994 First Qu port, wa level measurements and groundwater <br /> samples were obtained from tonng wells on January 28, 1994 Prior to <br /> groundwater g, er levels ere taken to evaluate the groundwater flow patterns <br /> underlying the sit undwater flow patterns during January 1994 as shown on <br /> Drawing 1-2 indicate a flow direction to the southwest, thereby designating monitoring well <br /> MW-1R as upgradient and wells MW-2R, MW-3R and MW4R as co-gradient or <br /> downgradient of the site <br /> A review of the analytical results (see Table 1), indicates a significant decrease in <br /> the concentrations of gasoline found in co-gradient well MW-2R compared with previous <br /> sampling round results Concentrations of total petroleum hydrocarbons as gasoline (TPH- <br /> g) decreased from 9.9 milligrams per liter (mglL) reported during the May 1993 sampling <br /> lie period to 12 mglL reported in January 1994 Similar changes were also noted in well MW- <br />