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M, a• 3. �' <br /> * g ^ <br /> T . <br /> Mr. John Margowski July 26, 1991 <br /> Wickland Properties <br /> 1765 Challenge Way <br /> Sacramento, Ca. 95814 <br /> ? (916) 921-1100 <br /> } FAX (916) 921-3510 <br /> RE: Update Assessment and Status Report #6 including the results <br /> of the vapor recovery with the January-February-March, and April- <br /> May-June, 1991, quarterly monitoring at former Regal Station 604, <br /> located a 1448 N. El Dorado Street, Stockton, California. <br /> Dear Mr. Margowski: <br /> The following is the update of events that have occurred at this <br /> site since Update Status Report #5-December, 1990. <br /> i <br /> s LOCATION <br /> } <br /> Regal Station 604 (parcel # 139-020-08) is located at 1448 N. El <br /> Dorado and :larding Way, Stockton, San Joaquin County, California. <br /> The site is in projected section 2; T1N; R6E; MDS&M at <br /> approximately 14 feet above mean sea level. Initial drilling <br /> kd (November, 1989) encountered ground water at approximately. 32 feet <br /> below sea level (47' below_ the' surface) and flowing in an east to <br /> southeasterlydirection, see figures 1, 2, and 3A. <br /> 4 <br /> UPDATE STATUS REPORT #5 (December, 1990) CONCLUSIONS AND <br /> RECOMMENDATIONS: <br /> 4 <br /> CONCLUSIONS <br /> The results of ground water monitoring, November 21, 1990, <br /> t indicate that the ground water has dropped approximately eight <br /> f.. feet since early January, 1990, and is flowing predominately to <br /> the southeast. Chemical results of the water samples taken from <br /> the monitor wells show contamination to the ground water with <br /> gasoline range hydrocarbons, see Table 1. <br /> soil contamination is limited to between the 25 foot and 40 foot <br /> --- ------- ----- depth-of-the eastern-and-western--portions-of-the-pump-island-_..-area---------- ----and southeast of the tank excavation, near soil boring SB2, see <br /> Figure 3B. This contamination is of gasoline range hydrocarbons. <br /> A vapor extraction source test indicates that approximately 59 <br /> pounds of gasoline range hydrocarbons can be pulled from the <br /> i. formation per day via wells P1. P3 and EX at a flow rate of 30 <br /> cubic feet per minute. Also vacuum readings taken from the ground <br /> s <br /> page 1 <br /> s <br />