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w <br /> AbW <br /> GROUND ZERO ANALYSIS;INC:- <br /> 1714 MainStreet <br /> Escalon,California 95320 <br /> Telephone;(209)838-9888 <br /> Facsimile:(209)838-9883 <br /> September 5,2008 <br /> Mr. Michael lnfiuna <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, CA 95202 <br /> Subject: Second Quarter 2008 Grom dwater Monitoring and Sampling Report <br /> Fortner Reeve's Exxon,.23b0 East Street,Tracy,California <br /> Dear Mr. Infurna. <br /> This letter report presents the results of the second quarter 2008 groundwater monitoring and <br /> sampling activities at the subject;site (Figure.l). <br /> - I <br /> QUARTERLY GROUNDWATER SAMPLING ACTIVITIES } <br /> Activities at the site included, monitoring water level elevations and purging and sampling <br /> groundwater from all site wells: Groundwater samples were analyzed for total, petroleum <br /> hydrocarbons as gasoline (TPHg) and 'benzene, toluene, ethylbenzene, total xylenes (BTEX). In <br /> addition, the samples collected from wells MWl, MW2.and MW4 were analyzed for volatile organic <br /> compounds (VOCs); the sample -from MW4 was analyzed semi-volatile organic compounds 1 <br /> (SVOCs); and the samples collected from wells MW1; MW4 and MW5 were.analyzed for dissolved j <br /> chromium (Cr) and molybdenum (Mo),-and chromium VI(Cr VI). 1 <br /> Groundwater Monitoring <br /> On July 29, 2008 monitoring wells MWI' through MW5 were monitored and sampled. Field <br /> activities for the second quarter'2008:monitoring event took .place during the third quarter of 2008 <br /> due to scheduling problems with the field-technician. Groundwater elevations were calculated by <br /> measuring the depth to groundwater in each well and subtracting from the respective wellhead <br /> elevation. The depth to groundwater,measured in site wells on July 29, 2008, ranged from 7.61 feet <br /> below the ground surface (bgs) in well MW3 to 8.83 feet bgs in MW5. Groundwater elevations in <br /> site wells decreased by an average of 1.'12 feet since last monitored on February 6, 2008. <br /> Groundwater flow was generally`Toward the north-northeast at a hydraulic gradient averaging <br /> approximately 0.008 ft/ft. A groundwater gradient inap created from the July 29, 2008 monitoring <br /> data is depicted on Figure 2. Current groundwater ;elevation data are summarized in'Table 1. <br /> Historic groundwater elevation data are summarized in Table 2. Monitoring data sheets are included. <br /> in Attachment A. <br /> I <br />