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22 Vest, I nc. <br /> ;e C --' :eino urine•%Nalnut CrQeK u-,inmia5:y2 ji 540 0a55• -. -lax(.11 5j 5.6 5=• <br /> July 15, 1991 <br /> Ms. Mary Meays <br /> Public Health Services/Environmental Health <br /> San Joaquin County <br /> _.. 1601 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 /> Well ConstruCtion <br /> f. <br /> The two monitoring wells were constructed on April 12, 1991 at the <br /> locations depicted in Figr •Q 1. The wells, labeled MW-4 and NEW-5, were <br /> located hydraulically dowi,gradient 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. Well screen was set at a depth interval of approximately <br /> TP. <br /> An attiliate of The Environmental Resources Management Group wim oftices wonowide arm— <br />