ARCHIVED REPORTS XR0010164 - Laserfiche WebLink

Home Browse Search

M1.0 Executive Summary Wright Environmental Services, Inc (Wright) performed a soil excavation and disposal for the site at 595 East 11th Street in Tracy, California The San Joaquin County Environmental Health Department (SJC EHD) reviewed the corrective action plan and area of proposed excavation in the Wright report and work plan dated October 10, 2003 and in field discussions with Wright personnel. SJC EHD representatives observed portions of the excavation work, dewatering point placement and all soil and water sampling Two monitoring wells (MW-3 and MW-9) were abandoned under SJC EHD permits during the excavation since the wells were located within that area. The purpose of the work was to remove suspected residual soil petroleum contaminants in the vadose zone, capillary fringe and upper aquifer strata in the area of the historically observed groundwater plume The excavation was dewatered during the work and approximately 900 cubic yards of soil was shipped to the Forward Landfill in Manteca and about 239,250 gallons of water was treated on-site using carbon for disposal to the City of Tracy sanitary sewer outfall under the appropriate approved pernut Wright estimates that about 787 gallons of TPHG and 41 gallons Benzene were removed contained in soil and 2 3 gallons TPHG and 0.21 gallons Benzene were removed dissolved in the groundwater Some of the residual contaminant soil source cannot be removed due to the large irrigation and City sewer lines in the plume area vicinity Wright recommends the following Groundwater monitoring is scheduled to continue at quarterly intervals for the site • Monitoring wells MW-3 andMW-9 will be re-installed at the locations discussed with the SJC EHD representative • Wright will contact the SJC EHD regarding the need for additional work following their review of flus report Page 3 of 13