Laserfiche WebLink
Quik Stop'Market No. 132 Page 2 <br /> 3555 West Hammer Lane June 5,2009 <br /> Stockton, California 95209 <br /> I <br /> ATC proposes to advance borehole SB-5 approximately eight feet northeast of soil boring SB-1, <br /> initially to an approximate depth of fifteen feet bsg. One soil sample is proposed to be collected <br /> at the capillary fringe, and one grab groundwater sample is proposed to be collected at <br /> approximately fifteen feet bsg. Then ATC proposes to advance the boring to approximately forty <br /> feet bsg and collect a grab groundwater sample. Instead of the proposed boring, the EHD <br /> believes a ,monitoring well should be installed adjacent to soil boring ATC-5, and screened <br /> between approximately twenty and twenty-five feet bsg. Noting that MTBE was detected at 2,900 F <br /> ug/L in a grab groundwater sample collected at twenty feet bsg from ATC-5, the EHD believes a <br /> monitoring well will better address the possible plume migration down gradient of the source <br /> area. <br /> h <br /> ATC proposes to continuously core borehole SB-6, approximately twenty feet southwest of i <br /> borehole SB-2, to approximately forty feet bsg for lithological evaluation and field screening. 1 <br /> One soil sample is proposed to be collected at the capillary fringe at approximately tenfeet bsg or <br /> ata depth identified to have significant volatile organic contamination based on readings from a <br /> photo-ionization detector. ATC also proposes to collect additional soil samples for chemical <br /> analysis if unsaturated soils are encountered between the shallow and deep groundwater zones. <br /> ATC proposes to collect grab groundwater samples from the shallow zone of approximately <br /> fifteen feet bsg, and from the deep zone of approximately forty feet bsg. The EHD approves the <br /> advancement of SB-6 as described. <br /> I <br /> Please respond to concerns and recommendations presented in this letter to the EHD by August 3, <br /> 2009. If you have any questions regarding this letter, please contact Vicki McCartney at (209) <br /> 468-9852 or by email at vmccartney@sjcehd.com. <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr.,PG <br /> Senior Registered Environmental Health Spec /list Engineering Geologist <br /> c: Scott Perkins, ATC Associates Incorporated, 6602 Owens Drive, Pleasanton, California <br /> 94588 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central Valley <br /> Region, 11020 Sun Center Drive, Suite 200,Rancho Cordova, California 95670 <br /> I <br /> I <br /> I <br /> E <br /> i <br /> I <br />