Laserfiche WebLink
f ' Second Quarter 1997 Status Report-Former bicovery Chevrolet <br /> July 7, 1997 <br /> The samples were analyzed by American Environmental Network (FLAP #1172) located in <br /> Pleasant Hill, California. <br /> TPHg or MTBE were not detected in the groundwater samples collected from wells MW-4 <br /> and MW-5. Benzene was not detected in the groundwater :sample from well MW-5. <br /> Benzene was detected at a concentration of 0.5 ppb in the groundwater sample collected from <br /> well MW-4. Concentrations of TPHg were detected in the groundwater samples from wells <br /> MW-1 (1,500 ppb) and MW-2 (2,400 ppb). Benzene was also detected in these groundwater <br /> samples at concentrations of 310 and 240 ppb, respectively. MTBE was detected in the <br /> groundwater samples from wells MW-1 and MW-2 at concentrations of 12 and 15 ppb, <br /> respectively. Groundwater monitoring well MW-3 was monitored only during the second <br /> quarter 1997 sampling event. TPHg, BTEX, or MTBE were not in the trip blank. <br /> These data have been used to construct a TPHgIBenzene/TPHd Concentration Map <br /> (Figure 4). <br /> Disposition of Well Pune Water <br /> A total of 270 gallons generated during the first.and second quarter 1997 monitoring events <br /> and installation of wells MW-4 and MW-5 was removed from the site on June 23, 1997, and <br /> .;. ._ transported to McKittrick Waste Treatment and Storage facility in McKittrick, California by <br /> Intergrated Wastestream Management (IWM). A copy of the water transport form is <br /> presented in Appendix D. <br /> DISCUSSION AND CONCLUSIONS <br /> During the second quarter 1997, groundwater was measured 0.14 to 0.25 feet lower than <br /> levels measured during the first quarter 1997. During the second quarter 1997, groundwater <br /> appeared to flow toward the north-northeast under a gradient of 0.004 ft/ft. These data <br /> appear generally consistent with historical mor itoring data. <br /> Petroleum hydrocarbons were not detected in well MW-5. TPHg benzene, and MTBE <br /> concentrations increased during the second quarter 1997 in wells MW-1 and MW-2. . <br /> Benzene decreased slightly in well MW-4. <br /> NEXT QUARTER'S PLANNED ACTIVITIES <br /> Activities planned for the second quarter 1997 at the subject site include: <br /> • Monitoring water levels in all wells. Purge and sample wells MW-1, MW-2, MW-4, <br /> and MW-5. Analyze the groundwater samples from wells MW-1, MW-2, MW-4, and <br /> MW-5 for TPHg, BTEX, and MTBE. <br /> 4 � <br /> 8146.04-2 4 <br />