ARCHIVED REPORTS_XR0005101 - Laserfiche WebLink

Home Browse Search

1 . • 2.0 GROUNDWATER MONITORING, SAMPLING AND ANALYSIS On September 18, 2001, Ramage Environmental monitored and sampled groundwater at the site ' 21 Groundwater Monitoring Upon arrival at the site, each of the wellheads was inspected, unlocked and opened Depth-to- groundwater was measured in each of the wells using a water level indicator capable of ' measuring groundwater to within 0 01 foot The static depth to the groundwater table, as measured in the three groundwater monitoring wells, ranged from 22 50 feet bgs in MW-2 to 22 58 feet bgs in MW-1 and MW-3 The corresponding groundwater surface elevation ranged from a high of 14 15 feet above mean sea level (msl) at ' MW-2 to a low of 14 06 feet above msl at MW-3 The resulting groundwater surface appears as a regular plane dipping to the west-northwest at a gradient of approximately 0 0012 foottfoot A ' groundwater surface contour map is included as Figure 3 The well construction details, wellhead elevations and groundwater monitoring data are summarized in Table 1 22 Groundwater Sampling and Analysis Following the groundwater level measurements, each of the wells was purged and sampled The wells were purged using a pump and dedicated disposable tubing, until at least three well casing volumes were extracted and/or after groundwater temperature, pH and electrical conductivity ' values had stabilized Following well purging and recharge, groundwater was sampled from the wells using dedicated disposable bailers and laboratory-supplied containers Each sample container was labeled, packaged in an iced cooler and transported with chain-of-custody documentation to Kiff Analytical, LLC (Kiff), a state of California certified hazardous waste testing laboratory Kiff analyzed each of the groundwater samples for TPH-as-diesel by EPA Method 8015M, and for TPH-as-gasoline, BTEX, MTBE, DIPE, ETBE, TAME, TBA, and 1,2-DCA by EPA Method 8260B 8