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i. <br /> Problem Assessment Report December 5, 1989 <br /> .-. USA Petroleum Station No. 65, Lodi, California AGS 87050-3 <br /> { <br /> i <br /> i <br /> The wellheads were secured in cast-aluminum utility boxes with PVC aprons. The boxes <br /> have watertight seals and were set in concrete approximately push with the surrounding <br /> ground surface to reduce surface-water infiltration. A special wrench is required to open <br /> the box. This design discourages vandalism and reduces the possibility of accidental <br /> disturbance to the well. Each wellhead was also fitted with a locking well cage to protect <br /> further against unauthorized disturbance of the well. <br /> I .. <br /> YS+eII Development <br /> 1 <br /> On January 19, 1989, we deve,oped wells h1W-4 and MW-S. We developed well MW-6 on <br /> � s <br /> . 'February 24, 1989, arid well 1v1W-7 on March 31, 1989. Each well was developed using a i <br /> 2-inch-diameter PVC surge block alternately raised and lowered through the water column s <br /> in each well. Development was performed to remove the fine-grained sediment from the <br /> monitoring well and to pack and sort the annular sand. The wells were purged using a <br /> stainless steel submersible pump. <br /> t <br /> Ground-Water Sampling <br /> 7 _ On January 20. 1989,we treasured ground-water levels, purged wells MW-1 through,illW- <br /> £ 5,collected groundwater samples for subjective analyses. and collected water samples for <br /> �S <br /> 4 ` 20 <br /> Applied Goo4gstems <br /> _ <br />