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1 <br /> GEOMATRIX <br /> it was covered with about 2 5 feet of soil forming a portion of a temporary equipment access <br /> ramp The ramp was constructed for equipment used to refurbish two anhydrous ammonia <br /> storage tanks at a nearby facility (see WGR letter in Appendix A) On October 16, 2003, wells <br />' MW3-2, MW3-1, MW3-5, MW3-4, and MW3-6 (Figure 2) were purged and sampled to that <br /> order Depth to groundwater was measured in the site monitoring wells before purging Prior to <br /> sampling each well, the presence of separate-phase petroleum hydrocarbon was assessed with a <br />' disposable bailer About 100 gallons of water was purged from each well using a dedicated <br /> stinger and vacuum truck Each dedicated stinger is stored on the site in an individual sealed <br />' plastic bag Suction on the vacuum truck line remains on during purging and while making and <br /> breaking the connection with the individual stingers <br />' After purging an initial 100 gallons from each well, field parameters (electric conductivity, pH, <br /> temperature, dissolved oxygen, and oxidation reduction potential) were measured and recorded <br />' on field data sheets (Appendix A) A new, clean disposable bailer was used to collect water <br /> from each well for field parameters After the first set of field parameters were collected and <br />' water levels had recovered, an additional 50 gallons of water was purged with the dedicated <br /> stinger New clean disposable bailers were used to collect the groundwater samples for field <br /> parameters and laboratory analysis of volatile organic compounds <br /> Groundwater samples were preserved and transported under chain-of-custody (Appendix B) <br /> procedures to Precision Enviro-Tech Analytical Laboratory in Stockton, California, a <br /> state-certified laboratory, for analyses The groundwater samples from the five sampled site <br />' monitoring wells were analyzed for total petroleum hydrocarbons quantified as gasoline (TPHg) <br /> and benzene, toluene, ethylbenzene, and xylenes (BTEX) using U S Environmental Protection <br />' Agency Method 8260B <br /> 3.0 MONITORING RESULTS <br />' Fourth quarter 2003 groundwater elevation data, groundwater flow direction and gradient, and <br />' analytical results are discussed in the following sections <br /> 3.1 GROUNDWATER ELEVATION,FLOW DIRECTION,AND GRADIENTS <br />' Groundwater elevation data from October 16, 2003 (Table 1), were used to construct <br /> potentiometnc contours on Figure 3 No floating product was reported in any of the site wells <br />' Groundwater levels have declined about 0 5 feet in the site monitonng wells since third quarter <br /> . 2003 <br /> I 11'R0JECM60W,\6437 000/6437 15 doc 2 <br />