Laserfiche WebLink
L <br /> 1 <br /> _ <br /> GEO- 'HAS <br /> ENVIRONMENTAL <br /> L11 <br /> REPORT <br /> Quarterly Groundwater Monit <br /> oring Event <br /> First Quarter 2006 <br /> Former Manna Pro Site <br /> 4004 S. E1 Dorado Street <br /> Stockton, California <br /> GPE Project No. 207.2 <br /> May S, 2006 <br /> +_ <br /> J,, <br /> 1.0 INTRODUCTION <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 March 21, 2006. <br /> E <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 /> 'i. <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 /> 2,931 Veneman Ave.,#B240 Geo-phase Environmental Inc. Phone(2099569-0 959 <br /> } <br />