ARCHIVED REPORTS XR0004761 - Laserfiche WebLink

Home Browse Search

Working To Restore Nature event in May 1994. Wells MW-8 and MW-9 were installed in June 1994. Water elevation has risen an average of 0.34 feet in wells MW-8 and MW-9. The groundwater monitoring data are summarized in Table 1 A groundwater gradient plot was created for the August 5, 1994, monitoring episode The gradient was generally consistent with previous data A groundwater gradient map is included as Plate 2. The gradient on the eastern portion of the site was to northeast at 0 003 ft/ft, the gradient on the western portion of the site was to the northeast at 0 0016 ft/ft. On August 5, 1994, groundwater samples were collected from wells MW-1, MW-2, and MW- 4 through MW-9 after purging and stabilization of pH, electrical conductivity (EC), and temperature Monitoring well purge logs are included in Attachment 1 During the quarter floating petroleum hydrocarbon product was noted 1n well MW-3 and ranged from 0 79 to 0.96 feet in thickness Free product was bailed from well MW-3 in June (0.95 liters [a), July (1.0 0 and August(1 2 1) for a total free product removal via bailing of approximately 3 15 liters for the quarter (Table 2) The recovered product is stored in a double contained, DOT approved drum LABORATORY ANALYSIS Groundwater samples were collected from wells MW-1, MW-2, MW-4 through MW-9, and analyzed by Sequoia Analytical dba Aspen Analytical, Colorado Springs, Colorado (FLAP Cert #2000) for benzene, toluene, ethylbenzene, xylenes (BTEX), and total purgeable petroleum hydrocarbons as gasoline (TPH as gasoline) by EPA methods 8020 and modified 8015, respectively A sample was not collected from MW-3 due to the presence of free product Laboratory analysis indicates the presence of petroleum hydrocarbons in the samples collected from MW-1, MW-2, MW-4, MW-5, MW-6, MW-7, and MW-9 Petroleum hydrocarbons were not present at or above method detection limits in the sample collected from well MW-8 The analytical results are summarized in Table 3, the laboratory reports and chain-of-custody documentation are presented in Attachment 2 FREE PRODUCT RECOVERY On September 15, 1994, RESNA installed an active free product removal system in well MW- 3 System operation was monitored on September 16, 1994. After 24 hours of operation 2 4 gallons of free product had been recovered At this time the system is cycling on for approximately 30 seconds and off for approximately 2 5 minutes The system will be monitored every two weeks so the recovered product can be transferred to a second double 1500701QUARTLYI3QR-1994 dm