ARCHIVED REPORTS_XR0010841 - Laserfiche WebLink

Home Browse Search

i k'9 KLE1NEELDER SVE-N resulting from injecting air into the subsurface. SVE-S is approximately 65 feet from the sparge well and SVE-N is approximately 70 feet from the sparge well. Dissolved oxygen in SVE-N and SVE-S was measured prior to pilot testing on October 15, 2002 and immediately following 4 hours of air sparging in the deep sparge well on October 21, 2002. t The results are presented in Table 1. i Table 1: Change In Dissolved Oxygen Due to Air Sparging 5 I t SVE-S 18.1% 24.7% +36% SVE-N 24.5% 37.2% +52% The results indicate a significant increase in dissolved oxygen resulting from the air sparging. Considering SVE-S and SVE-N are 65 and 70 feet from the sparge well, the results appear to corroborate the bubble flux radius of influence estimate of 64 feet for the deep sparge well. The amount of oxygen delivered versus the influenced volume of groundwater was estimated based on the sparge flowrate and the duration of operation. Sparging for 4 hours at 5 scfm represents the delivery of 9.7e6 mg of oxygen to the subsurface as follows: t3 liters min m l 5-f air 28.3 3 air �4hours 60 285 g 02)=9.7e6 mg 02 min ft hour liter The volume of groundwater over which this oxygen is delivered is roughly that groundwater lying above the leading front of the deepest sparge path. This volume can be estimated utilizing the sparge path equation along with the soil porosity p and shape constant k as follows: 45 ft 64 ft Y = { dP) f f Ids — k„2 )dr dS 137 ft 4 f 122801SAC2R566 Page 5 of 9 November 25,2002 Copyright 2002 Kleinfelder,Inc.