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i <br /> Pete Graffigna <br /> Flame Mini-Mart ' <br /> 1301 W Kettleman Lane, Lodi <br /> Page 3 of 3 <br /> i <br /> The WP proposes three additional MWs which are approved by EHD. These MWS will <br /> not only characterize the vadose zone, but will also better characterize the groundwater <br /> plume. They may also serve as monitoring points for the proposed ozone injection pilot <br /> test. <br /> Along with the three proposed MWs, EHD recommends two additional MWs and three <br /> additional soil borings. Additional MWs on the south side of Kettleman Lane are now <br /> warranted. The two MWs should be located to th'e east and to the west of existing MW- <br /> 5, which has increasing MTBE concentrations. These MWs should aid with <br /> characterizing the southern extent of dissolved groundwater plume. With MW-5 <br /> currently encountering increasing in MTBE concentrations, these recommended MWs <br /> are needed down-gradient of the site to monitor the expanding groundwater plume. <br /> One of the recommended additional soil borings jshould be in or adjacent to the former <br /> UST pit west of former B-4. The soil boring B-4 only went to 25 feet bgs and no deeper <br /> sail data is available at that location. The other two recommended soil borings should <br /> be south and southeast of the former UST pita EHD believes that all three borings <br /> should have a target depth of 70 feet bgs. Vapor extraction wells could be installed in <br /> those borings that yield significant indications of !impacted soil. If soil contamination is <br /> found to be extremely high, these soil vapor extraction wells may be useful for soil <br /> remediation to reduce the sorbed contaminant mass. By reducing the soil contaminant <br /> mass, there will be less mass that could leach and impact groundwater thereby <br /> decreasing the time for groundwater cleanup. <br /> i <br /> A revised work plan or response that addresses the additional recommended soil <br /> borings and MWs must be submitted by 28 June 2004. The information obtained from <br /> these areas should aid with further defining the contamination and in refinement of the <br /> SCM. <br /> If you have any further questions regarding this matter, contact Harlin Knoll at (209) <br /> 468-3442. ' <br /> Donna Heran, RENS, Director <br /> Environmental Health Department <br /> Harlin Knoll, Senior REHS Nuel Henderson, PG <br /> LOP/Site Mitigation Unit IV I LOP/Site Mitigation Unit IV <br /> cc: CVRWQCB — Jim Barton <br /> cc: SWRCB, Cleanup Fund <br /> cc: AGE — Donna Sexton <br />