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y v � <br /> Quik Stop Market No. 132 Page 2 <br /> 3555 West Hammer Lane September 24,2009 <br /> Stockton, California 95209 <br /> tr j <br /> ATC proposes to install monitoring well MW-11, screened between approximately twenty <br /> and twenty-five feet bsg, as recommended by the EHD by letter dated June 5, 2009. <br /> Instead of installing the monitoring well adjacent to soil boring ATC-5, as recommended <br /> by the EHD, ATC proposes to install the well adjacent to the northeast side of soil boring. <br /> SBI. Please provide technical justification for installing MW-11 at the proposed location i <br /> 6" directly adjacent to the northeast side of SB1, considering methyl tertiary-butyl ether <br /> (MTBE)was detected at 2,900 micrograms per liter (pg/L) in a grab groundwater sample <br /> collected at twenty feet bsg from ATC-5, and at 21 pg/L at twenty-four feet bsg from <br /> �. boring SBI. <br /> When installing MWA1, ATC,proposes to collect soil samples at five-foot intervals for <br /> Iithological evaluation; ATC also proposes to analyze soil samples collected just above <br /> the water table at approximately ten feet bsg, and where there is evidence of <br /> contamination based on readings taken from the photo-ionization detector and visual <br /> observation The EHD concurs with these recommendations; however, the EHD <br /> disagrees with the well construction of MW-11. ATC proposes to fill the annular space <br /> with sand from total depth to approximately four feet bsg, bentonite from approximately <br /> four to three feet bsg, and portland cement (grout)from approximately three feet to one- <br /> half foot bsg for this well screened between approximately twenty and twenty-five feet <br /> bsg. Please refer to the San Joaquin County Well Standards for guidance. <br /> Please address concerns and recommendations by the EHD and resubmit the work plan <br /> to the EHD by November 4, 2009. If you have any questions regarding this letter, please <br /> contact Vicki McCartney at (209)468-9852 or by email at vmccartney@sjoehd.com. j <br /> Sincerely, err <br /> Victoria L. McCartney, REH5U Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> End: <br /> c: Scott Perkins, ATC Associates Incorporated, 6602 Owens Drive, Pleasanton, <br /> California 94588 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central <br /> Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California <br /> 95670 <br /> w <br /> V � <br /> V <br /> L <br />