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_�- Geological Audit Services In <br /> `V4F_,HTAL HEALTH <br /> Environmental Professionals y ; .� <br /> 1803 W.March Lane,Suite •Stockton,CA 95207•(209)956 026A,X 49 956}0700 <br /> II t 9 �2�4�' 3 493 <br /> Ms. Mary Meays, REHS <br /> San Joaquin County PHS/EHD <br /> 445 N. San Joaquin Street <br /> Stockton, CA 95201 II <br /> �I <br /> Subject: Babka Distributing Company <br /> 1149 W. Weber <br /> Stockton, CA 95201 <br /> Dear Ms. Meays: <br /> I <br /> Regarding your letter of June 24 , 1993 hnd 'subsequent telephone <br /> conversations of July 1, 1993 and Augusfl_ 201 <br /> 1993 , we have the <br /> following comments for your consideration. <br /> We have recommended to our client, the , Bank of Stockton, that <br /> monitoring activities for the 3rd quarter oif 1993 be performed <br /> before the end of September, as requested by ;you. This monitoring <br /> and sampling is to include MW-1, MW-2 , and MW-3 . <br /> II <br /> We have not recommended that monitoring b'e continued for a fourth <br /> quarter. Instead, we recommend that aI� de11. <br /> csion on additional <br /> monitoring be postponed until after the results of the 3rd quarter <br /> monitoring have been obtained. <br /> Excavation to remove the contaminated soil took place on January <br /> 16-18, 1992 . When excavation was terminated, PID measurements on <br /> excavated soil revealed no evidence of further contamination. Soil <br /> samples were collected from the sidewlalls of the excavation <br /> approximately two weeks later (February 3) , and the sidewalls were <br /> further excavated an additional 2-3 feet at y�'pur request in order <br /> to expose _ fresh. soil —and-.- insure that any remaining soil <br /> contamination had not escaped due to exposure and aeration. No <br /> contamination was detected at that time. Samples were also <br /> collected from the excavated soil (samples 11 A1, A2 , A3, A4 ; BSP- <br /> B1, B2; and BSP-C1, C2) ; again, benzene Vlas n1ot detected. <br /> Subsequently, M11-2 and MW-3 were drilled.p No ,,enzene was detected <br /> at a depth of 10 feet, but a concentration of 33 ppb (detection <br /> limit 5 ppb) was detected at 15 feet Alin MW-2 . This depth is <br /> approximately 3 feet below both the mean depth to groundwater and <br /> the depth at which the confirmatory soil samples had been collected <br /> from the excavation sidewal.ls. It is 2 feet below the depth at <br /> which the first soil samples were collected froni beneath the UST's <br /> by Sequoia Analytical in April 1991, and whist'► contained 32 , 10, <br /> and 26 ppb benzene. <br /> 1 <br /> Full Spectrum Environmental Services• Hydroge logy <br />