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1 _ <br /> • - GEOTHASE <br /> - ENVIRONMENTAL <br /> REPORT <br />' Quarterly Groundwater Monitoring Event <br /> 7 October 1999 <br />' Former Manna Pro Site <br /> 4004 S. El Dorado Street <br />' Stockton, California <br />' Project No 207 2 <br /> 12 November 1999 <br />' 1.0 INTRODUCTION <br />' Groundwater monitoring wells were installed at the site at various times from <br /> 1990 to 1993 Quarterly groundwater monitoring has been conducted at the site <br /> since the first wells were constructed This work has been performed by several <br /> consulting companies, most recently, by Azure Environmental of San Rafael, <br /> California Recently, Geo-Phase Environmental assumed the responsibilities as <br />' the environmental consultant for this remedial investigation, and this is the first <br /> monitoring event completed by Geo-Phase for this site This report documents <br /> preliminary well maintenance work as well as a quarterly round of groundwater <br />' monitoring and sampling completed on 7 October 1999 <br /> 1 1 Site History <br />' Two 10,000 gallon underground diesel tanks and two 5,000 gallon underground <br /> gasoline tanks and a single 10,000 gallon underground gasoline tank formerly in <br /> use at the site were removed in 1990 Confirmation soil samples collected from <br /> the tank pit contained elevated levels of gasoline and diesel range petroleum <br /> hydrocarbons Subsequently, several thousand yards of impacted soil were <br /> iexacted and removed to help mitigate the release <br />' In October of 1990, ERM West conducted additional work to characterize the <br /> lateral and vertical extent of the hydrocarbon contamination in the sub-surface <br />' 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0295 <br />