SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

y Pacific Car Wash page 2 4405 Pacific Ave. Stockton AGE noted that GWE results at a nearby UST site were successful at controlling the migration of that petroleum plume and compared construction details with EW-1. Discussions in the Report suggested that drilling procedures at the time of EW-1's installation may have compromised the well's ability to recharge quickly. EHD recommends that EW-1 be aggressively re-developed and the pumping test conducted again. If new pumping data on the re-developed EW-1 supports the conclusion that GWE can be a feasible option for removing petroleum from the ground water and controlling the offsite migration of the plume, EHD will comment on the report of findings of the second pump test. Please include a cost analysis/estimate to install and operate a two-well GWE remedial alternative and a proposal for treating and disposing the ground water produced by the GWE process in the report that is to be submitted to EHD. Additional recommendations in the Report included interim soil vapor extraction (SVE) in the areas of most intense vadose zone petroleum-impact(i.e. P-2 and P-3) in conjunction with interim groundwater pump and treat remediation. EHD agrees that SVE in the sandy zones at this site may be effective in reducing the concentrations of petroleum in the vadose soils but will need to evaluate a feasibility study and pilot test for SVE. Please submit a proposal for SVE testing and include residual vadose mass estimates and well installation details. Interim GWE and SVE is not approved at this time. Please contact Mr. Infurna at (209) 468-3454 if you have any questions or you may email him at minfurna(a-)sicehd.com. Donna Heran, REHS, Director Environ ental Health Department ,jai[ 4z, .. Michael J. Infurna Jr., Senior REHS Nuel Henderson LOP/ Site Mitigation Unit IV Professional Geologist MI/ c: CVRWQCB—Jim Barton, Sacramento c: SW RCB—CUF— Mark Owens, Sacramento c: AGE —Timothy Cuellar, 837 Shaw Rd, Stockton.