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SECOR www secor com <br /> 1NTERNATIONAL 3017 Kilgore Road Swte 100 <br /> E C ® R INCORPORATED Rancho Cordova CA 95670 <br /> 916-861-0400 TEL <br /> 916 861-0430 FAX <br /> p ��L`� E11 V ISD <br /> September 4, 2003 o <br /> SEP 0 8 2003 <br /> Ms Vicki McCartney ENVIRIONMEW HEALTH <br /> San Joaquin County Environmental Health Department PERMIT/SERVICES <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> I <br /> RE Quarterly Groundwater Monitoring Report-Second Quarter 2003 --L1 'off <br /> ConocoPhillips (Former BP) Station No 11193 d <br /> 3202 West Hammer Lane r � ,y(d <br /> Stockton, California r� ` <br /> SECOR Project Nos 77CP 60193 00 0002/77BP 50193 00 0436 <br /> 1 <br /> Dear Ms McCartney <br /> SECOR International Incorporated (SECOR) is providing this report to summarize the second <br /> quarter 2003 groundwater monitoring event at the above-referenced site <br /> COMPLETED ACTIVITIES - Second Quarter 2003 <br /> x <br /> • Performed groundwater monitoring and sampling of wells on June 27, 2003 <br /> • Weekly interim groundwater batch extraction performed by Onyx Industrial Services, Inc <br /> (Onyx) r <br /> • Prepared and submitted quarterly groundwater monitoring report <br /> PLANNED ACTIVITIES -Third Quarter 2003 <br /> • Perform quarterly groundwater monitoring and sampling in September 2003 <br /> • Prepare and submit quarterly groundwater monitoring report <br /> • Continue with weekly interim groundwater batch extraction performed by Onyx <br /> • Prepare and submit revised interim remedial action plan and work plan for additional site <br /> assessment <br /> DISCUSSION <br /> On June 27, 2003, SECOR measured groundwater levels within and collected groundwater samples <br /> from eleven wells (MW-1R, MW-2R, MW-3 through MW-10, and VW-1) Depth to water <br /> measurements and calculated groundwater elevation data are included in Table 1 Groundwater <br /> elevation data were used to construct a potentiometric surface map, which is included as Figure 1 <br /> During the second quarter 2003, the direction of groundwater flow was determined to the northeast, ` <br /> at a hydraulic gradient of 0 0007 foot per foot (ft/ft) Historical groundwater gradient data are <br /> presented in Table 2 'Groundwater elevations decreased by an average of 0 36 foot (ft) from then <br /> previous quarter Field procedures for groundwater monitoring are included in Attachment 1- Field 4 <br /> data sheets showing recorded depth to groundwater levels are included in Attachment 2 ` <br /> d v <br /> f , <br /> Groundwater samples were submitted for analysis of total petroleum hydrocarbons as gasoline <br /> (TPHg), benzene, toluene, ethylbenzene, and total xylenes (BTEX), fuel oxygenates methyl tertiary <br /> butyl ether (MtBE), ethyl tertiary butyl ether (EtBE), di-isopropyl ether (DIPE), tertiary amyl methyl <br /> ether (TAME), tertiary butyl alcohol (TBA), and ethanol, and lead scavengers 1,2 dichloroethane <br /> 1ConocoPhiIhps\Tosco Marketmg\1 11931QMR12QMR03 Final doc <br />