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T <br /> FILE COPY <br /> PUBLIC <br /> AALTH SE RVI ES oPa� N <br /> SAN JOAQUIN COUNTY ei <br /> i <br /> ENVIRONMENTAL HEALTH DIVISION ` <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 9� FORa` <br /> 209/468-3420 <br /> FEB 2 0 2001 <br /> Mr. Jeffery Setness <br /> Jeff B. Setness Professional Law Corp. <br /> 3203 West March Lane, Suite 120 <br /> Stockton, CA 95219 <br /> RE: FORMER CHASE CHEVROLET FACILITY <br /> 424 VANBUREN <br /> STOCKTON,CA 95201 <br /> Subject: QMR comment and Workplan Approval <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD) has <br /> reviewed the Rerrn"Action Work PlanAddenium-Nownier 2000(the work plan) dated November <br /> 27,2000 and the Qriane-4Report-Third Qwrter 2000(the report) dated October 27,2000 prepared by <br /> Advanced GeoEnvironmental,Inc. (AGE). PHS/EHD has the following comments. <br /> The soil vapor extraction(SVE) and an in-situ air sparing(IAS) system began operation at the site in <br /> November 1999. The report stated the effectiveness of the SVE system continued to decrease since <br /> the groundwater level began to rise in April 2000. Analytical results of the ground water samples <br /> collected from the highest impacted monitoring well N 3 W--3) located at the center of the plume, <br /> and MW-9 which is the northernmost well with high contamination remained relatively unchanged. <br /> Analytical results of the vapor samples collected from the inlet port of the SVE system,readings of <br /> the air stream flow rate,vacuum pressure,and photo-ionization detector(PID) from Vapor Well k 3 <br /> (VW-3) which is located northeast(down gradient direction) of MW-3,readings of VW-5 which is <br /> located west of MW-3,horizontal vapor extraction well li 1 (HW-1) which is the northwest most <br /> horizontal well,HW-5 which is the horizontal well located closest to MW-9,HW-8 which is on the <br /> second row of horizontal wells,and the depth to water(DTq levels and analytical results of the <br /> groundwater samples of MW-3 and MW-9 are as follows: <br /> Va or inlet samples analytical results of TPH as Gasoline TPH- inµ /l <br /> SampleDat 12-21-99 01-19-00 03-08-00 04-06-00 05-24-00 06-07-00 09-28-00 <br /> e <br /> Vapor 1 1,400 1 1,200 1 98C 1510 1490 160 <br /> V W-3 Flow in scfm ,Vacuum in inches of water),and PID in parts per million <br /> Sample Date 12-30-99 1-27-00 3-30-00 4-28-00 5-23-00 6-15-00 9-26-00 <br /> Flow 42.9 17-33 27.7 12.4 12.4 0 12A <br /> Vacuum 48 38 Water 40 39.0 40.0 22.0 <br /> PID 38 695 106 165.1 82.6 105 7.9 <br /> A Division of San Joaquin County Health Care Services <br />