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Darpetro , Inc. Page 2 of 2 <br /> 749 E. Charter Way 14 August 2009 <br /> Stockton , CA <br /> AEI states in the SCM/RAP that at the meeting between AEI and EHD on 13 March 2008, AEI <br /> had agreed to advance a boring east of the site to address a data gap. Actually, a monitoring <br /> well (MW-15) had previously been approved for the northeast corner of Charter Way and Grant <br /> Street, and AEI had agreed to install that well , not a boring . The EHD letters of 13 March 2008 <br /> and 05 December 2008 refer to this agreement. AEI states in SCM/RAP that they wanted to <br /> review the data obtained from a boring advanced near the corner as part of another <br /> investigation and make a recommendation for additional drilling , if necessary. <br /> The boring AEI refers to is SB-3 , advanced by Geological Technics, Inc. (GTI ) near the <br /> proposed location of MW-15 as part of the investigation of the site at 814 E . Charter Way, <br /> commonly referred to as the Morita Brothers site . The boring was advanced to obtain grab <br /> groundwater samples; soil samples were not collected . The grab groundwater sample from 33 <br /> to 37 feet below surface grade (bsg ) did not contain detectable concentrations of total petroleum <br /> hydrocarbons quantified as gasoline (TPHg), benzene , toluene , ethylbenzene or total xylenes <br /> (BTEX), methyl tert-butyl ether (MTBE) or 1 ,2-dichloroethane (1 ,2-DCA) , but the sample from 65 <br /> to 75 feet bsg contained 1 ,300 microgram per liter (Ng/L) TPHg , 770 pg/L benzene, 6. 6 pg/L <br /> toluene , 4. 8 pg/L ethylbenzene and 21 pg/L 1 ,2-DCA. A monitoring well is clearly needed here, <br /> and the previously approved MW-15 should be installed as has been agreed . <br /> Questions or comments may be directed to Nuel Henderson , Professional Geologist, at <br /> (209) 468-3436. <br /> Sincerely, <br /> Nuel C. Henderson , Jr. , PG Margar�o,R S <br /> Engineering Geologist Program Coordinator <br /> C: J . Barton — CVRWQCB ; 11020 Sun Center Dr. #200, Rancho Cordova, CA 95670 <br /> D. Lafontaine — AEI ; 11244 Pyrites Way, Gold River, CA 95670 <br /> D . Van Allen — AEI ; 3446 N . Golden State Blvd . , Ste. C; Turlock , CA 95382 <br /> SCM/RAP Comment Letter 0809 . doc <br /> f <br />