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r • �I <br /> ENVA00NMENTAL AUDIT, INC. <br /> 1000-A ORTEGA WAY • PLACENTIA, CA 92870-7162 tv <br /> 71Y$3,27$521 FAX: 714/632-6754 <br /> 11 <br /> December 27, 2000 <br /> EAI Project No. 1232 <br /> Marty Hartzell <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3003 <br /> RE: GROUND WATER MONITORING WELL SAMPLING TECHNIQUE <br /> Montgomery Ward Auto Service Center and Former Unocal Site <br /> 5400 and 5606 Pacific Avenue <br /> Stockton, California <br /> Cleanup and Abatement Order No. 5-00-707 <br /> Dear Mr. Hartzell: <br /> Pursuant to our telephone conversation and due to the fact that the majority of the ground water <br /> monitoring wells associated with the above two referenced sites currently have ground water <br /> above the well screens, future sampling events will be completed as follows: <br /> • Each well will be purged of approximately three well casing volumes using a <br /> submersible pump. <br /> • Ground water samples from each well for analytical testing will then be collected from <br /> across the well screen interval using a point source bailer. <br /> The pump used to purge the wells and the point source bailer will be decontaminated between <br /> each well using a solution of Alconox detergent and tap water and then rinsed with tap wat r. <br /> Please call me at 714/632-8521, extension 226, if you have any questions or need additional <br /> information. <br /> Sincerely, <br /> ENVIRONMENTAL AUDIT, INC. <br /> Brent H. Mecham, R.G. <br /> Senior Geologist <br /> BHM:SAB:sh <br /> PLANNING,ENVIRONMENTAL ANALYSES AND <br /> HAZARDOUS SUBSTANCES MANAGEMENT AND REMEDIATION <br />