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SECOR <br /> www secor con <br /> INTERNATIONAL <br /> S E C ® R INCORPORATED Ran Kilgorecho Cordova CAA 9 95 100 <br /> Rancho T �, <br /> 916-061-0400 TEL <br /> u i <br /> 918-0FAX <br /> Fruc <br /> IT <br /> August 24, 2004 <br /> kt <br /> x, <br /> Ms Vicki McCartney <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor T <br /> Stockton, CA 95202 <br /> RE Quarterly Groundwater Monitoring Report-Second Quarter 2004 <br /> 76 (Former BP)Service Station No 11193 <br /> 3202 West Hammer Lane +' <br /> Stockton, California w <br /> SECOR Protect Nos 77CP 60193 01 0001/77BP 50193 02 0436 <br /> Dear Ms McCartney <br /> SECOR International Incorporated (SECOR) Is providing this report to summarize the second <br /> quarter 2004 groundwater monitoring event at the above-referenced site <br /> COMPLETED ACTIVITIES - Second Quarter 2004 <br /> • Performed groundwater monitoring and sampling of wells on June 8, 2004 <br /> • Weekly interim groundwater batch extraction performed by Onyx Industrial Services, Inc <br /> (Onyx)through June 8, 2004 <br /> • Weekly Interim groundwater batch extraction discontinued after Installation and activation of <br /> the ozone sparge (OS)system on May 25, 2004 <br /> • Water levels measured on June 11, 2004 following groundwater batch extraction activities <br /> on June 8, 2004 <br /> • Prepared and submitted first quarter 2004 groundwater monitoring report <br /> PLANNED ACTIVITIES -Third Quarter 2004 <br /> • Perform quarterly groundwater monitoring and sampling <br /> • Prepare and submit second quarter 2004 groundwater monitoring report <br /> • Perform operation and maintenance of the OS system <br /> • Perform additional on-site assessment for vertical delineation, and off-site assessment for <br /> lateral delineation of petroleum hydrocarbons and fuel oxygenate Impacts <br /> DISCUSSION <br /> On June 8, 2004, SECOR measured depth to groundwater and collected groundwater samples from <br /> eleven wells (MW-1R, MW-2R, MW-3 through MW-10, and VW-1) During the time of water level <br /> gauging, groundwater batch extraction activities were concurrently performed on well MW-1R by s; <br /> Onyx In order to Wtaln-gr uo ndwater data representative of the potentlometnc surface, SECOR <br /> returned to the site on June`11, 2004 to collect an addltlanal set of water level measurements from <br /> site wells Depth to water measurements from the June 8 and 11 water level gauging events, and <br /> calculated groundwater elevation data are Included In Table 1 Groundwater elevation data from the <br /> June 11, 2004 gauging event were used to construct a potentlometrlc surface map, which Is Included <br /> as Figure 1 During the second quarter 2004, the direction of groundwater flow was radially outward <br /> 11ConocoPhdlips\Tosco Marketing1111931QMR12QMR04 Final doc <br />