ARCHIVED REPORTS XR0007825 - Laserfiche WebLink

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1 t41) 0 ll Ms Lori Duncan Page 2 of 4 . to 0 36 feet on November 18, 2002 The measured product thickness on December 30, 2002 was 0 45 feet Approximately 7 6 gallons of product/water mixture was removed from well MW3 during the reporting period by manually bailing the product from the well The waste was stored on site in accordance with 49 CFR part 172 and 40 CFR part 262 Table 1 summarizes product thickness measurements and product removed Field notes associated with product bailing, including a chart showing the measured product thickness in the well over time, are included in Attachment A Groundwater Monitoring Water level elevations were monitored in wells MW1, MW2 and MW4 on December 9, 2002 The depth to water and product in well MW3 could not be measured because the water/hydrocarbon interface probe was unavailable on December 9, 2002 However, the water levels for all site wells were again monitored on December 14, 2002 The depth to water and depth to product in well MW3 were measured using an electronic water/hydrocarbon interface probe, and the depths to water in wells MW1, MW2, and MW4 were measured using an electronic water level indicator Groundwater elevations were calculated by subtracting the measured depth to groundwater in each well from the respective wellhead elevation The depth to groundwater in the wells on December 10, 2002 ranged from 24 90 to 25 60 feet below the tops of the well casings(btoc) The potentiometnc surface fell an average of 0 76 feet since the last event (September 19, 2002) Groundwater flowed in a northeasterly direction with a calculated gradient of approximately 0 0027, or approximately 14 feet per nule A potentiometric surface map for December 10, 2002 is shown on Figure 2 Groundwater monitoring data • are summarized in Table 2 Monitoring data sheets are included in Attachment B Groundwater Sampling Due to the presence of free product in well MW3, groundwater samples were only collected from welts MW 1, MW2 and MW4 Prior to collecting samples, a minimum of three well casing volumes of water was purged from each well using dedicated bailers During the purging process the physical parameters of temperature, pH and electrical conductivity were measured All downhole equipment was decontaminated between wells by washing with a solution of laboratory-grade detergent, and then double rinsing with clean rinse water Groundwater samples were collected using dedicated, disposable bailers after the physical parameters had stabilized and water levels recovered to within 80% of their pre-purged levels The samples were placed into an ice chest refrigerated to approximately 4°C and transported to Argon Laboratories (FLAP #2359) under chain of custody protocol Well purge logs are included in Attachment B Liquid Waste Disposal On December 19, 2002, American Valley Waste Oil removed and transported approximately 50 gallons of product/water mixture and purged groundwater that was removed from site wells and temporarily stored on site The liquid waste was transported off-site for disposal Attachment C contains copies of the waste manifest and load ticket that document liquid waste disposal 0\GAOLTNDZE\GABBARD\reports\4QM2002 doc