ARCHIVED REPORTS_XR0005102 - Laserfiche WebLink

Home Browse Search

2.0 GROUNDWATER MONITORING, SAMPLING AND ANALYSIS On June 8, 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 19 57 feet bgs in MW-2 to 19 68 feet bgs in MW-1 The corresponding groundwater surface elevation ranged from a high of 17 08 feet above mean sea level (msl) at MW-2 to a low of 16 98 feet above msl at MW-1 The resulting groundwater surface appears as a regular plane dipping to the west at a gradient of approximately 0 0017 foot/foot 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 (Certification#2236) 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