Laserfiche WebLink
1 <br /> • 10 March 2003 <br /> AGE_NC Project No 95-0185 <br /> Page 2 of 4 <br /> ' Temperature,pH and conductivity were measured at regular intervals during purging at wells MW-2, <br /> MW-3 and MW-5 using an Oakton water analyzer(Appendix B), ground water parameters were not <br /> measured at wells MW-1 and MW-4 due to the presents of free-product Purged water was stored <br /> ' on-site in 55-gallon Department of Transportation (DOT)-approved drums <br /> r2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Ground water samples were collected from the purged wells using the dedicated, disposable-plastic <br /> bailers Each water sample was transferred into three 40-m1 volatile organic analysis (VOA) vials <br /> conta irig 0 5 ml 18% HCl as a sample preservative and one 1-liter amber bottle without <br />' preservative The samples were then labeled and placed in a chilled container for transport under <br /> cham-of-custody to Cal Tech Environmental Laboratories (CTEL) of Paramount California, a <br /> California Department of Health Services (DHS)-certified analytical laboratory <br />' All water samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in <br /> accordance with EPA Method 8015 Modified and <br /> R Benzene, toluene, ethylbenzene and total xylene (BTEX) and methyl tertiary butyl ether <br /> (MTBE) in accordance with EPA Method 8021 <br /> 3.0 FWDINGS <br /> The ground water elevation, gradient and flow direction were determined from the field data <br /> Contan-nnant impact to ground water were assessed by laboratory analysis <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' During the February 2003 sampling event,the depth to groundwater ranged from 23 43 feet(MW-2) <br /> to 24 51 feet (MW-5) below casing grade However, the depths to ground water at wells MW-1 and <br /> MW-4 were affected by the presence of free product, the thickness of free product was measured at <br /> 0 32 feet and 0 24 feet,respectively Subsequently,the depths was recalculatedutilizingthe measured <br /> thicknesses of free product in wells MW-1 and MW-4 <br />' D,,, =Dm - (tg * d�dW) <br /> Advanced GeoEnvironmental,Inc <br />