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WAI I I<WI1Kh CO)RI' <br /> A RfSNA i omµlnY - -— -- --- <br /> Em lronrnental Solutions <br /> Through Applied Sc it tic( <br /> Engineering A Construction <br /> 1710 Main Sirt.0 <br /> [',orlon CA 95 120 <br /> Phom (209) 818 3507 <br /> I ax (209) X3 3509 � 9 � f a September 6, 1991 <br /> i <br /> Mr Steve Schneider <br /> San Joaquin County PubIlc Health Services <br /> Environmental Health Division <br /> P O. Box 2009 <br /> Stockton, CA 95201 <br /> Re Third Quarter Monitoring Report for J B Terminal 6700 Grantline <br /> Road, Tracy, CA <br /> Dear Steve <br /> On July 11, 1991, groundwater monitoring was conducted at the above referenced site on wells <br /> MWI, MW2, and MW3 (Figure 1) During monitoring, the depths to water were measured„ <br /> the wells were purged and samples were collected pursuant to WaterWork's Quality <br /> Assurance/Quality Control Plan (attached) <br /> Depth to water has risen approximately 5 6 to 6 2 feet 1n all wells since our April 1991 <br /> monitoring (Table 1). The gradient was calculated, using a computer Kriging program, to be <br /> in a north-northeast direction at 0 009 ft/ft, which is consistent with previous gradients (Figure <br /> 2), <br /> Samples collected were analyzed for benzene, toluene, ethylbenzene, and xylenes (BTEX), and <br /> total petroleum hydrocarbons as gasoline(TPHG) Dissolved petroleum hydrocarbons were again <br /> detected In monitoring well MWI but no petroleum hydrocarbon constituents were detected <br /> above detection limits in monitoring wells MW2 or MW3 Elevated petroleum hydrocarbon <br /> constituents found In MWI appear to be related to the rise in groundwater levels Analytical <br /> data Is presented in Table 2 The laboratory data sheet and chain-of-custody are attached <br /> WaterWork recommends continued groundwater monitoring Our next monitoring will occur <br /> in October and a monitoring report will be submitted in November <br /> torr R905 ap <br /> i <br />