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i <br /> i <br /> M <br /> GEOTHASE <br /> - ENVIRONMENTAL <br /> REPORT <br /> Quarterly Groundwater Monitoring Event <br /> Fourth Quarter 2005 <br /> Former Manna Pro Site <br />' 4004 S. El Dorado Street <br /> Stockton, California <br />' GPE Project No 207 2 <br /> February 15, 2006 <br /> 1.0 INTRODUCTION <br /> 1 • Groundwater monitoring wells were installed at the site at various times from <br /> 1990 to 1993 More recently, a deep monitoring well (MW-11) was constructed <br />' in April of 2000, and then abandoned in July of 2001 Quarterly groundwater <br /> monitoring has been conducted at the site since the first wells were <br /> constructed This report documents a quarterly round of groundwater <br />' monitoring and sampling completed on December 14, 2005 <br /> 1.1 Site History <br /> Two 10,000-gallon underground diesel tanks and two 5,000-gallon <br />' underground gasoline tanks and a single 10,000-gallon underground gasoline <br /> tank formerly in use at the site were removed in 1990 Confirmation soil <br /> samples collected from the tank pit contained elevated levels of gasohne and <br />' diesel range petroleum hydrocarbons Subsequently, several thousand yards <br /> of impacted soil were exacted 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- <br /> surface This included installing 25 soil borings into groundwater of which, a <br />' total of 6 borings were later converted to groundwater monitoring wells <br /> • <br />' 2937 Veneman Ave ,*B240 Geo-Phase Environmental Inc Phone (209) 569 0293 <br /> Modesto, CA 95356 Fax (209) 569-0295 <br />