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I <br /> 1 - GEO-PHASE• <br /> ENVIRONMENTAL <br />' REPORT <br /> Quarterly Groundwater Monitoring Event <br />' Fourth Quarter 2003 <br /> Former Manna Pro Site <br /> 4004 S. El Dorado Street <br /> Stockton, California <br />' GPE Project No 207 2 <br /> February 6, 2003 <br /> 1.0 INTRODUCTION <br /> 1� <br /> 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 19, 2003 <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 gasoline 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 /> 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax(209) 569-0295 <br /> 1 <br />