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C A M B R I A Date: March 31, 2005 <br /> Quarter: 1"Quarter 2005 <br /> OLYMPIAN QUARTERLY GROUNDWATER MONITORING REPORT <br /> Fund Claim No.: 12820 Address: 22502 South Highway 99, Ripon, California <br /> Consulting Co./Project Manager: Cambria Environmental Technology Inc./Eugene Pak <br /> Consulting Co. Project No.: 165-1556 <br /> Primary Agency/Regulatory ID No.: San Joaquin County Environmental Health Division/ <br /> Site Code: 1604 <br /> WORK PERFORMED THIS QUARTER (FIRST- 2005): <br /> 1. Performed first quarter groundwater monitoring and sampling activities on February 2, 2005. <br /> 2. Submitted quarterly groundwater monitoring report for first quarter 2005. <br /> WORK PROPOSED FOR NEXT QUARTER (SECOND—2005): <br /> 1. Perform quarterly groundwater monitoring and sampling for second quarter 2005. <br /> 2. Prepare and submit quarterly groundwater monitoring report for second quarter 2005. <br /> 3. Prepare and submit work plans for additional site assessment and feasibility testing. <br /> QUARTERLY MONITORING: <br /> Current Phase of Project: Monitoring and assessment <br /> Frequency of Groundwater Monitoring: Quarterly <br /> Is Free Product(FP) Present on Site: No <br /> Current Remediation Techniques: Natural Attenuation <br /> Average Depth to Groundwater: 24.37 ft below ground surface <br /> Groundwater Flow Direction and <br /> Gradient Southwest; 0.0006 ft/ft <br /> DISCUSSION: 2 <br /> Groundwater levels measured on February 2, 2005 indicate that oundw ter beneath the site <br /> flows toward the south and southwest at a gradient of approximately 0.00O,Vft/ft. Groundwater <br /> flow direction has fluctuated since groundwater monitoring began in August 1999. Groundwater <br /> elevation contours are shown on Figure 2. P� 1a r °' <br /> -r d rpt <br /> 1 <br /> Groundwater samples were analyzed for total petroleum hydrocarbons as diesel (TPHdf and total t j 5 <br /> petroleum hydrocarbons as gasoline (TPHg) by modified United States Environmental protection <br /> Agency (EPA) Method 8015C; benzene, toluene, ethylbenzene, and xylenes (BTEX) and methyl <br /> tertiary-butyl ether (MTBE) by EPA Method 802113; and di-isopropyl ether, ethyl tertiary-butyl <br /> ether, tertiary-amyl methyl ether, tertiary butyl alcohol, ethylene dibromide, 1,2-dichloroethane <br /> (DIPE, ETBE, TAME,TBA, EDB, 1,2-DCA) and MTBE confirmation by EPA Method 8260B. <br /> TPHd was detected in wells MW-1 throug MW-3, MW-6 and MW-9 at concentrations ranging <br /> from 91 micrograms per liter (gg/L) to 0,000 µg/L. TPHg was detected in wells MW-1, <br /> MW-2, MW-6, and MW-9 at concentrations ranging from 51 µg/L to 480µg/L. TPHd and TPHg <br /> were detected at maximum concentrations in the sample collected from well MW-6. Benzene <br /> was detected only in well MW-6 at a concentration of 8.5 µg/L. MTBE was detected in wells <br /> Ha01ympian122502 South Hwy 99,RiponIQM11Q 05AQ 05 QMR.doc <br />