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ERM-West' Inc. <br /> ;;to • i!a!n Jt GreeK.Gar`om a �55n �°�2 W6at5:93.0» : -9;58 <br /> Gob c!e no Drive <br /> July 15, 1991 <br /> Ms. Mary Meays <br /> Public Health Services/Environmental Health <br /> San Joaquin County <br /> 1801 East Hazelton Avenue <br /> Stockton, California 95201 <br /> Subject: Quarterly Ground Water Monitoring Report <br /> 1515 West Weber Avenue, Stockton,CA <br /> Site Code: 1284 <br /> Dear Mary: <br /> ERM-West, Inc. has completed additional work at 1515 West Weber Avenue. <br /> The work consisted of the construction and sampling of two new <br /> monitoring wells and resampling of three existing monitoring wells. This <br /> letter contains a report of our findings. <br /> Wpll Construction <br /> 1 The two monitoring wells were constructed on April 12, 1991 at the <br /> locations depicted in Figure 1. The wells, labeled MW-4 and MW-5, were <br /> located hydraulically downgradient of the tank site and within the <br /> boundaries of the former tank location, respectively. The soil borings at <br /> each location were drilled to 30 feet and sampled at 5 foot intervals. A <br /> portion of the sample at each depth interval was preserved for subsequent <br /> laboratory analyses. The remainder of the sampled soils were used for <br /> classification according to the United Soil Classification System (see <br /> enclosed boring logs) and for preliminary field screening by head space <br /> analysis. <br /> After the borings were advanced to a depth of 30 feet,they were completed <br /> as monitoring wells. Well completion information is attached with each of <br /> the boring logs. A copy of the San Joaquin County well permit is also <br /> included. <br /> The two wells were constructed of 2-inch diameter, flush-threaded, <br /> --------- - - - - ---Schedule 40 PVC.-Nell screen was set at a depth intervalofapproximately_- --_ -_ - <br /> T%v <br /> An atliliate a!The Environmentat F7esources Management GravD wen ott ces worldwide a <br /> r <br />