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Upgradient�'nvironmental Co*ultan <br /> March 28,2002 MAR 2 9 2002 <br /> Mr.Ken Gillies ENVIR01MVENT HEALTH <br /> Gillies Trucking PERMIT/SERVICES <br /> P. 0.Box 8303 <br /> �OU " <br /> Stock-ton, <br /> kton,CAA 95208 <br /> Subject: First Quarter 2002 Monitoring Report <br /> Gillies Trucking Yard <br /> 3931 Newton Road <br /> Stockton,CA <br /> Dear Mr. Gillies: <br /> On February 22, I visited the site to find out whether monitor well GT-2 had been uncovered so <br /> that I could schedule a regular groundwater monitoring event.In addition,I checked the depth to <br /> groundwater in GT-10 to determine whether it would be possible to perform a groundwater <br /> pumping test of this well during the next monitoring event. <br /> I was only able to locate four of the seven monitor wells: GT-3, GT-5, GT-6, and GT-10. Both <br /> GT-1 and GT-2 are buried below a thick layer of road base gravel, and I was unable to locate <br /> them.Well GT-9,on the former Barbot property,was also buried or hidden by weeds and/or a <br /> large pile of broken concrete and other debris.In addition,the casing(standpipe)for GT-3 had <br /> been broken off,making it impossible to use this well to measure the groundwater elevation for <br /> the purpose of determining the groundwater flow direction. <br /> The depth to water in GT-10 was 57.05 feet,which is approximately 5 feet below the base of the <br /> aquifer sand that requires testing. At this depth,there is slightly less than 3 feet of water in the <br /> well,and it is present within the low-permeability(10-8 cm/sec)silt bed that underlies the aquifer. <br /> In my professional opinion,this amount of water is insufficient for aquifer testing;the well <br /> would go dry in less than 5 minutes of testing.Therefore,this test cannot be performed at this <br /> time. <br /> I then measured the water depth in the other two wells(GT-5 and 6)and have prepared the <br /> enclosed groundwater elevation map using the three-point method.This method is not as <br /> accurate as could be accomplished with more wells, but it appears that the flow direction was <br /> northeastward. <br /> I recommend that you instruct one of your employees to search for and locate the buried wells <br /> and remove the covering material so that we can perform a regular monitoring/sampling in early <br /> April. Please telephone me when this has been done, and I will place it on the schedule. <br /> Si erely, <br /> 1 yP�a v p/ <br /> , . <br /> Victor B. Cherven <br /> Principal Geologist z <br /> cc: Jeff Wong,PHS/EHD <br /> Marty Hartzell, CVRWQCB <br /> OFC <br /> Stockton: <br /> Stockton: P.O. Box 8002, Stockton, CA 95208 (209) 772-3620 <br /> B <br /> -3055 <br /> Cameron Park: 3369 Kimberly Road, Cameron Park, CA 95682 (530) 677 <br />