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WAIT k vYa)Eih cfwl, <br /> AM <br /> t N!S 4.1(eurTp�m A WE AM <br /> pwr <br /> Fat)rimint wj/tinlurionti <br /> I hrosigh Appl)c rl Sc n nc e <br /> fn,')nt c ri n:A (nmrnu rine <br /> 1710 MdM Shit t <br /> I-N, 110(, CA 9SI20 <br /> I'hc�ra� (2(19) 818 35117 <br /> 1 pit (2(191 Fca� �5i19 <br /> September 6, 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' Third Quarter Monitoring Report fori.B Termimu- 6700 Grantline <br /> Road, Tracy, CA <br /> Dear Stev;, <br /> On July 11, 1991, groundwater monitoring was conducted at the above referenced site on wells <br /> MNV1, MW2, and MW- (F ,gure 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 in 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(TPUG) Dissolved petroleum hydrocarbons were again <br /> detected in monitoring well MW1 but no pztroleum hydrocarbon constituents were detected <br /> above detection limits in monitoring wells MW2 or MW3 Elevated petroleum hydrocarbon <br /> 4—mstituents found in MW 1 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 attache_+ <br /> WaterWork recommends continued groundwater monitoring Our next monitoring will occur <br /> in October and a monitoring report will be submitted in November <br /> iiari R%5. <br />