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rl <br /> GeoQical Audit Serv6e , !n <br /> :'P. <br /> —" Environmental Professionals <br /> low t$03W.MarchLane,9L7iteA•5tocicton,CA95207+(2b�956=0264• p4X(2Q5j95 OIgQ <br /> I :T <br /> ,kuqust 24, 1993 <br /> IS <br /> Ms. Mary Me-aye, RENS <br /> San Joaquin County PHS/EHD <br /> 445 X. San Joaquin Street <br /> Stockton, CA 95201 r <br /> sub-jects babica Distributing company <br /> 1149 1W.. Weber 's <br /> Stockton, CA 95901 <br /> tiE <br /> r ' <br /> Dear Ms. Meays: <br /> Regarding your letter of June 24, 1993 and nub cent telephone <br /> conversations of .July 1, 1993 and August 20'' .199;x, we have the <br /> following comuonts for your consideration. <br /> We have recommended to our cliesat, them Sank of '.;Stockton, that <br /> monitoring activities for the 3rd quarter of 199:3 be performed ' <br /> before the end of September, as requested by you. This monitoring <br /> 4 and sampling is to include MW-1, MW-2, aili`d MW,„3. <br /> I� I <br /> We have not recommended that monitoring be continued for a fourth <br /> quarter. Instead, we recommend that all decisionj, on additional. ; <br /> monitoring be Postponed until after the resulis-of tr1e 3rd quarter <br /> monitoring have been obtained. jol <br /> Excavation to remove the contaminated soil, took p4ace on January <br /> 16-18, 1992. When excavation was terminated, P-IQ Measurements on <br /> excavated soil revealed no evidence of furthex cont urination. Soil <br /> samples were collected frvn the s�deialls of 'thy excavation <br /> ! <br /> approximately two weeks later (February 3) , and,thy; sidewalls were <br /> further excavated an additional 2-3 feet flat your ripquest in order { <br /> to expose fresh soil and insure that any ;remainiaig soil J <br /> contamination had not escaped due to exposure arod aeration. No <br /> contamination was detected at that time. Samples were also <br /> collected from the excavated soil (samples SSP;-Ai, 12, A3, A4; BSP- <br /> 1 a1, B2; and BSP-C1, C2) ; again, benzene was nat defected. <br /> Subsequently, DdW-2 and MW-3 Were drilled No benzeine was detected ' <br /> at a depth of :10 feet, but a concentration of 33 :ippb (detection <br /> limit 5 ppb) was detected at 15 feet in MW-2. This depth is <br /> approximately i feet below both the mean }depth 'to ,groundwater and <br /> the depth at which the confirmatory soil samples hard been collected <br /> from the excavation sidewalls. It is 2 1f'eet- be°lq�+ the depth at <br /> which the first soil samples were collected from b0heath the UST's C <br /> by Sequoia Analytical in April 1991, and whiII contained 32, 10, <br /> and 26 ppb benzene. 1 <br /> { <br /> f . 1 <br /> Full Spectrum Environmental SeMcBs Hydrogeology <br /> .A <br /> ! <br /> t <br /> I <br /> 7 iE <br />