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JM Equipment page 2 <br /> 1245 W. Charter Way March 24, 2009 <br /> Stockton, CA 95206 <br /> Former borings GP-4 and GP-5 were installed in 2008 under the covering and although <br /> only low levels of soil contamination were detected in each, the ground water grab <br /> samples had elevated levels of petroleum, with the most northern boring, GP-4 <br /> encountering 35,000 micrograms per liter (ug/L) of total petroleum hydrocarbons as <br /> gasoline (TPHg). The closest monitoring well to this point is MW-6 to the east; 119 ug/L <br /> of TPHg were detected in this well for the November 2008 event. This area is not <br /> characterized adequately and further investigation in required. The EHD requires that a <br /> boring be installed north of proposed CPT-1 and northeast of former GP-4 and have a <br /> ground water sample collected. <br /> The Plan is approved with the above noted conditions. [H&SC 25296.10(c)(3)]. Please <br /> submit a Well Permit Application Form and $404 fee by April 6, 2009. If contingency <br /> boring(s) are needed east of CPT-5 or CPT-11 or CPT-16, an access agreement and an <br /> additional application and fee will be needed to install CPT-6 and/or CPT-12 or CPT-17 <br /> at 1145 W. Charter Way. <br /> The report of findings for this phase is to be in the format of an updated site conceptual <br /> model (SCM) and should be on Geotracker within 60 days of the last CPT boring <br /> installation. Please consolidate all GTI soil data into one table that includes all of the <br /> boring, push point, and well installation soil data. Soil iso-concentration maps are to be <br /> included also for all constituents of concern. The updated feasibility study is to be <br /> included in the SCM also. <br /> If you have any questions, you may contact Michael Infurna, at (209) 468-3454. <br /> Michael J. Infurna Jr., REHS Nuel C. Henderson Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> MJ I: <br /> cc: Mr. James L. Barton, CVRWQCB - 11020 Sun Center Dr., #200 Rancho <br /> Cordova, CA 95670-6114 <br /> Mr. Mark Owens, SWRCB-CUF, P.O. Box 944212 Sacramento, CA 94244-2120 <br /> Mr. Raymond Kablanow, Geological Technics — 1101 7'" St., Modesto, CA <br /> 95354 <br />