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1 <br /> i <br /> - GEO-PHASE <br /> - ENVIRONMENTAL <br /> REPORT <br />' Quarterly Groundwater Monitoring Event <br />' First Quarter 2003 <br /> Former Manna Pro Site <br />' 4004 S. E1 Dorado Street <br /> Stockton, California <br /> IProject No 207 2 <br /> April 23, 2003 <br /> 10 INTRODUCTION <br /> Groundwater monitoring wells were installed at the site at various times from <br />' g o <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 /> Imonitoring and sampling completed on March 25, 2003 <br /> 1.1 Site History <br /> Two 10,000-gallon underground diesel tanks and two 5 000- allon <br /> g g g <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 ,#13240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0295 <br />