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t <br /> 1117 Lone Palm Avenue <br /> Suite B a <br /> Modesto CA 95351 <br /> 2095792221 <br /> Fax 209 579 2225 <br /> December 3, 1998 <br /> 62514 <br /> Mr N ichael Infuma. <br /> San Joaquin County Public Health Services � - U <br /> Environmental Health Division ` <br /> P O Box 2009 <br /> Stockton, CA 95201 <br /> Subject Third Quarter 1998 Groundwater Monitoring Report for King Island Resort, 11530 <br /> West Eight We Road, Stockton, California Site Code 1557 <br /> Mr Infirm <br /> This letter report is presented to update site activities performed during third quarter 1998 at 11530 <br /> West Eight Mile Road, Stockton, California (Figure 1) Site activities included quarterly groundwater <br /> t <br /> monitoring and sampling <br /> { GROUNDWATER MONITORING <br /> ! The third quarter groundwater monitoring and sampling of monitoring wells MW 1 through MW6 was <br /> conducted by ATC Associates Inc personnel on September 25, I998 Water level measurements were <br /> collected from all monitonng wells prior to purging and sampling <br /> Subsequent to monitoring, each well was purged by extracting a minimum of three well casing volumes <br /> of groundwater While purging, groundwater parameters (temperature, conductivity, and pH) were <br /> monitored and allowed to stabilize before water samples were collected Samples were collected using <br /> dedicated, disposable bailers with bottom emptying devices to reduce volatilization All purged <br /> groundwater was contained in 55-gallon drums approved for hazardous liquid storage on-site pending <br /> appropriate disposal Groundwater well purge and sample logs are contained in Attachment 1 <br /> The groundwater samples collected from each well were placed on ice and transported under <br /> chain-of-custody documentation to Sequoia Analytical (FLAP #1210) in Redwood City, California <br /> The groundwater samples were analyzed for total petroleum hydrocarbons as diesel (TPHd), total <br /> petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, and xylenes <br /> (BTEX) and methyl tertiary butyl ether (MTBE)utilizing EPA methods 8015/8020 <br /> RESULTS <br /> Water levels have decreased an average of 103 feet since the last monitonng event on June 23, 1998 <br /> (Table 1) A groundwater gradient map was created using the data collected on September 25, 1998 <br /> -\625141quad1yL3gr-1998 doc 1 <br /> I <br />