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WAIkKW()xK CO RI' <br /> RTSVA[ampinv Env irnnmen#a]5171ul101", <br /> Thrigigh APP11(d Sc 1V1Xd*, <br /> Fnginet ring d Cun»rrm lion <br /> 1710 Main Stred <br /> E%c.alun CA 95120 <br /> Phone (209) 818-1507 , <br /> F11r (209) 818-1509 <br /> October 23, 1991 <br /> Mr Steve Schneider <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 2009 <br /> Stockton, CA 95201 <br /> RE. Fourth Quarter Monitonng Report for . B Terminal 5700 <br /> Grantline Road, Tracy, California <br /> Dear Steve <br /> On October 9, 1991, groundwater monitoring was conducted at the above referenced site on <br /> wells MW1, MW2, and MW3 (Figure 1) During monitonng, the depths to water were <br /> measured, the wells were purged and samples were collected pursuant to RESNA/WaterWork's <br /> (RESNA) Quality Assurance/Quality Control Plan (Attachment 1) Well purge logs are included <br /> in Attachment 2 <br /> Depth to water has decreased approximately 1 44 to 1 49 feet in all wells since the July 1991 <br /> monitoring. Groundwater monitoring data is summarized to Table 1 The gradient was <br /> calculated, using a computer Kriging program, to be in a north-northeast direction at 0 009 ft1ft, <br /> which is consistent with previous gradients (Figure 2, Groundwater Gradient Map) <br /> Samples collected were analyzed for benzene, toluene, ethylbenzene, and xylenes (BTEX), and <br /> total petroleum hydrocarbons as gasoline (TPHG) utilizing EPA method 503018020/8015 <br /> Dissolved petroleum hydrocarbons were detected in monitoring well MW 1 at the following <br /> concentrations* 1,100 µg/f TPHG, 8 1 kLg/f benzene, 1 3 IA-/f toluene, 84 µglf ethylbenzene, <br /> and 80 deg/f xylenes No petroleum hydrocarbon constituents were detected above method <br /> detection limits in monitoring wells MW2 or MW3. At your direction, a sample was also <br /> collected from the on-site industrial supply well and analyzed for BTEX and TPHG No <br /> constituents were present above method detection limits. Analytical data is presented in Table <br /> 2. The laboratory data sheets and chain-of-custody documentation are included in Attachment <br /> 3 <br /> JBTi023 WP <br />