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Limited Phase II Environmental Site Assessment <br />United Storage <br />2115 West Washington Street <br />Stockton, California <br />Delta Project No. A002-124-1 <br />Page 4 <br />3.5 Sample Collection for Laboratory Analyses <br />3.5.1 Soil Sample Collection <br />One soil sample from each soil boring was collected and submitted for chemical analysis. Generally, the <br />sample was collected from the interval exhibiting the highest observed PID vapor reading. If no elevated <br />PID readings were observed, the sample was collected from near the soil/ground water interface or where <br />visual evidence of contamination was found. The soil samples were stored in an iced cooler immediately <br />after collection and during transport. The samples were submitted under proper chain-of-custody protocol <br />to Kiff Analytical of Davis, California, for the following laboratory chemical analyses: <br />VOCs by United States Environmental Protection Agency (EPA) Method 8260; <br />TPH-G by EPA Method 8260; <br />TPH-D by Modified EPA Method 8015; and <br />RCRA 8 metals by SW-846 6010. <br />The following list summarizes the sampling intervals for soil samples selected for laboratory analyses: <br />• B1-12 12 feet <br />• B2-12 12 feet <br />• B3-8 8 feet <br />• B4-16 16 feet <br />• B5-8 8 feet <br />• B6-8 8 feet <br />• B7-12 12 feet <br />• B8-8 8 feet <br />• B9-8 8 feet <br />• B10-12 12 feet <br />3.5.2 Ground Water Sample Collection <br />During the advancement of the soil borings, ground water recharge was observed to be slow. To <br />facilitate ground water sample collection, a temporary standpipe was installed in each borehole. The <br />standpipes consisted of a dedicated 10 foot long, 0.01-inch slotted polyvinyl chloride (PVC) well screen <br />and 10 foot long PVC riser. Standpipes were placed to the base of each borehole. Each standpipe was <br />monitored periodically until enough water had accumulated in the standpipe to collect a ground water <br />sample. Ground water samples were collected using clean disposable bailers, poured into the <br />appropriate containers, and stored in an iced cooler immediately after collection and during transport. <br />Ground water did not accumulate in borings B-1, B-3, B-4, B-6, and B-9. <br />e: \westwayterminalco \a002124 N1-stockton, ca\docs \stockton phase ii report.doc