Laserfiche WebLink
' 27 May 2004, <br /> AGE-NC Project No 96-0229 <br /> Page 3 of 7 <br /> filling and capping Ground water sample containers were labeled with the well designation, date, <br /> time, and sampler's Initials <br />' 2 1 2 Laboratory Analysis Of Ground Water Samples <br />' Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br /> transported to a California DHS-certified laboratory for analysis for <br />' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method <br /> SW5030/8015, <br /> • Benzene, toluene, ethylbenzene, xylenes (BTEX)by EPA Method 8020, and <br /> Ethylene dlbromlde (EDB), 1,2-dichloroethane (1,2-DCA), tert-butyl alcohol (TBA), di- <br /> isopropyl ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl methyl ether (TAME) and <br />' methyl tert buyl ether(MTBE) by EPA Method 8260B <br /> lie 3.0. FINDINGS <br /> Ground water monitoring field data was utilized to determine ground water flow direction and <br /> gradient on 25 November 2003, hydrocarbon Impact to ground water was quantified by laboratory <br /> analysis of samples collected between 25-28 November 2003 <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The 25 November 2003 ground water elevation at wells MW-1 through MW-19 were calculated by <br />' subtracting the measured depth to ground water from the surveyed casing elevation The ground <br /> water elevation data collected from the site was plotted for the Informal hydrogeologlc flow units <br /> `First Water Zone' and-`Second Water Zone' as defined In AGE's Multi-Level Monitoring Well <br />' Installation Report(dated 10 May 2004) The depth to ground water measurements varied from the <br /> Jr_1 __;=yells be±:=peen 31 92 feet 1'—1 r_S1 -rd 33 d5 feet k—11 12) I„elv::r the top of yell cusi:ar", <br /> ground water elevation was calculated to be between 19 45 feet(MW-4and MW-5) and 21 52 feet <br /> (MW-18D)below mean sea level Generally,ground water elevation at the site decreased an average <br />' 0 66 feet between the August 2003 and the November 2003 ground water monitoring events <br /> Ground water elevation data collected from wells MW-1, MW-2, MW-3, MW-13 (A-D), MW-14 <br /> . (A-D) and MW-16 (A-E) on 25 November 2003 was depicted on cross section B-B'(Figure 3), by <br /> determining the difference between ground water elevations (dh) and dividing by the difference of <br />' Advanced GeoEnvi ron mental,Inc <br /> I + <br />