Laserfiche WebLink
6100 N. Highway 99 March 4,2010 <br /> ARCO Station#595 page 2 <br /> sample PB-3-17' reported 2,200 milligrams per kilogram (mg/kg) total petroleum <br /> hydrocarbons as gasoline (TPHg). This area was over excavated to a depth of 21 feet below <br /> surface grade (bsg), but stained soil and hydrocarbon odors were still observed. No soil <br /> sample for laboratory analysis was collected from this depth. <br /> Please proceed with submittal of a work plan to investigate the vertical extent of the <br /> groundwater contamination, and the vertical and lateral extent of the contamination reported <br /> during the removal of the UST's. The work plan is due for submittal to the EHD no later than <br /> May 7, 2010. <br /> Please note that Table 2: Historical Groundwater Gauging and Analytical Data has <br /> erroneously reported 1,2-DCA results for wells MW-2, MW-3, MW-4, MW-5, MW-7 and MW-8 <br /> in the ethanol column. The data reported for 1,2-DCA, ethanol and EDB in MW-1 are all <br /> mixed up; and it appears the reporting limits for ethanol and EDB are switched for many <br /> wells also. These results are from wells which no longer exist at the site, but the data is <br /> important in formulating the site conceptual model and determining all future actions needed <br /> at the site. Please fix the table in all future reports. <br /> If you have any questions please call Lori Duncan at (209) 468-0337. <br /> Sincerely, <br /> Lori Duncan, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: James Barton, CVRWQCB, 11020 Sun Center Drive #200, Rancho Cordova, CA 95670 <br /> David Evans, ARCADIS, 950 Glenn Drive, Suite 125, Folsom, CA 95630 <br />