Laserfiche WebLink
1 <br /> 1 <br /> GEO-PHASE <br /> ENVIRONMENTAL <br /> i <br /> REPORT <br /> Vapor Extraction 1 Air Sparge Remedial System Construction <br /> Former Manna Pro Site <br />' 4004 S. E1 Dorado <br /> Stockton, California <br />' September 26,2003 <br /> GPE Project No 207 3 <br /> CWQCB Site Code T0607700412 <br /> 1 Geo-Phase Environmental Inc , on behalf of the Manna Pro Corporation constructed an <br /> integrated remedial system consisting of 11 vapor extraction wells, 8 air sparge wells, and <br />' the associated piping and surface equipment intended to complete the engineered <br /> mitigation of the gasoline release at this site The following sections describe the work <br /> completed to construct the system <br /> 1.0 INTRODUCTION <br />' Field work and groundwater monitoring completed at the site since 1990 show that <br /> former leaking underground storage tanks impacted the soil and groundwater with <br />' gasoline range petroleum hydrocarbons The previously issued report of a feasibility <br /> study estimated that about 22,000 pounds of gasoline are resident in the soil and <br /> groundwater as a result of the release <br /> Over the past several years, groundwater monitoring data have been collected from 14 <br /> monitoring, extraction, and observation wells situated through and around the <br /> contaminant plume The available data suggests that the contaminant plume is stable and <br /> has not migrated off of the Property except in a small area to the west under El Dorado <br /> Street The continued high levels of gasoline and volatile organic hydrocarbons in <br /> groundwater samples collected from on-site wells, however, suggest that natural <br /> attenuation is not adequately mitigating the groundwater plume Over the past three years <br /> a pilot test of air sparge and vapor extraction technology was completed Based on the <br /> results of the pilot test and a feasibility study, a CAP recommended that corrective action <br /> be undertaken in two phases The first phase was completed in 2002, and operated for 90 <br /> 2937 Veneman Ave , #B240 Geo-Phase Environmental Inc Phone(209)569-0293 <br /> Modesto, CA 95356 Fax(209)569-0295 <br />