Laserfiche WebLink
of 1 i <br /> 1 <br /> Quik Stop Market No. 132j Page 2 <br /> 3555 West Hammer Lane June 5,2009 <br /> Stockton,California 95209 <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 grabgroundwater sample is proposed to be collected at i <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 0of the proposed boring, the EHD <br /> believes a monitoring well should be iristalled 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 ! j <br /> ug/L in a grab groundwater sample collected at twenty feet bsg from ATC-5, the EHD believes a 1` <br /> monitoring well will better address the possible plume migration down gradient of the source L <br /> area. <br /> ATC proposes tocontinuously core borehole SB-6, approximately twenty feet southwest of <br /> borehole SB-2, to approximately forty feet bsg for lithological evaluation and field screening. <br /> One soil sample is proposed to be collected at the capillary fringe at approximately ten feet bsg or <br /> at a 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 groundwaier 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 /> SII <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@sjceh'd.com. <br /> f <br /> Sincerely, <br /> CY <br /> Victoria L.McCartney,REH$ Nuel C.Henderson,Jr.,PG <br /> Senior Registered Environmental Health Spe ralist s Engineering Geologist <br /> li <br /> c: Scott Perkins, ATC Associates_ Incorporated, 6602 Owens Drive, Pleasanton, California <br /> 94588 �+ I <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 c <br /> 9] <br /> 3' <br /> �I <br /> Q: <br /> `i <br /> B' <br /> } 4 <br />