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41 / " 0 0 <br /> page 2 <br /> 16 E Harding <br /> The report recommends that interim remediation/feasibility testing be conducted to <br /> determine the efficacy of dual phase extraction as a remedial option at this site <br /> PHSIEHD agrees that, with the levels of MtBE present at this site, interim measures <br /> should be taken as soon as possible to contain the plume Please prepare a work plan <br /> for the proposed action and submit it to PHSIEHD by December 15, 2000 <br /> Additional site assessment is necessary to define the vertical and lateral extent of the <br /> contaminant plumes in both sod and groundwater Depth discrete samples will be <br /> required to define the vertical extent of the groundwater contamination at depths below <br /> the screen intervals of the current onsite mon1tor1►1g wells Deep, discretely screened <br /> monitoring wells will be required The lateral extent of both the shallow and the deep <br /> contaminant plumes must be defined Submit a work plan to continue the investigation <br /> of this site to PHSIEHD by January 8, 2000 <br /> A well survey that identified permitted water supply wells located within one half mile of <br /> the site was included in the report The survey identified five wells located east of the <br /> site on the grounds of the Stockton State Hospital Please note that there is an out of <br /> service California Water Supply well (Station #26) located near the intersection of <br /> Wyandotte and Commerce, approximately 2,000 feet northwest of the subject site <br /> While this well may not be in service at this time, until it is destroyed it should be <br /> included in the survey The report recommends that a door-to-door well survey be <br /> conducted within a 500 foot radius of the site to verify the absence of sensitive receptors <br /> in the immediate area PHSIEHD agrees with this recommendation, and directs that the <br /> survey be expanded to include a conduit study that details all potential migration <br /> pathways and conduits (sewers, storm drains, etc) that may be present near the site <br /> If you have any questions or comments please call Lori Duncan at (209) 468-0337 <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> L,V-" Ct AaA-6� <br /> Lori Duncan, Senior REHS Dot Lofstrom <br /> LOP/Site Mitigation Unit IV Registered Geologist, Unit IV <br /> cc Marty Hartzell, CVRWQCB <br /> Rusty Benkosky, SECOR <br />