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A = HA E <br /> GEOP S <br /> - = ENVIRONMENTAL <br /> REPORT <br /> r n water Monitoring Quarterly G ou d g Event <br /> Fourth Quarter 2004 <br /> Former Manna Pro Site <br /> 4004 S. El Dorado Street <br /> Stockton, California <br /> GPE Project No..207.2 <br /> April 18, 2005 <br /> 1.0 INTRODUCTION_ <br /> Y r S <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 /> z constructed. This report documents a quarterly round of groundwater <br /> monitoring and sampling completed March 18, 2005. <br /> 1.1 Site History <br /> Two 10,000-gallon underground diesel tanks and two 5,000-gallon , <br /> a 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 /> L` of impacted soil were exacted and removed to help mitigate the release. <br /> x <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 Fax2 <br /> ( 09) 569-0295 <br /> s <br />