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1 <br /> Well using the check valve in tube technique Samples were transported on ice for delivery under chain <br /> Of custody to Sherwood Labs for analysis <br /> WATER TABLE ELEVATIONS AND GRADIENT <br /> Soundings on the monitoring wells showed the groundwater elevation has Iowered+/-5'feet from the <br /> Iast soundings on 03/09/01 The hydraulic gradient ofthe water table is to the North This is basically <br /> the same as the Iast event Rates for purging continue to be +/- 1 0 g p in <br /> WATER SAMPLE ANALYSIS FINDINGS <br /> In general,monitoring well samples taken on 09/14/01 were very similar to the previous sample event <br /> MW-3S is the only monitoring well with BTEX compounds determined by EPA Method 602 and <br /> 5030/8015(M) The purgeable Halocarbon 1,2-Dichloroethane continues to be present in all of the <br /> wells with the exception ofMW-4S and MW-413 I or the first time on record,Tetrachlorethene was <br /> not present in any of the monitoring wells <br /> F orthis event,compound 1,2-Dichloroethane is present in low concentrations in wells MW-1,MW- <br /> 2D, MW-3S, and MW-313 (see recap of data attached) <br /> CONCLUSIONS <br /> BTEX compounds for this event in the MW#3S remain in the same range as the past spring event <br /> This monitoring well is receiving the highest impact of all the wells due to TANK#1 (the Stoddard's <br /> Solvent tank), which is usually up gradient and Northwest ofMW#3S Low concentrations of 1,2- <br /> dichoroethane remain in monitoring wells MW41, MW#2S, MW#2D, MW#3S, and MW3D <br /> RECOMMENDATIONS <br /> The author requests that al l monitoring we]Is continue to be sampled in semiannual events to conserve <br /> financial resources A receptor survey should be conducted to determine the location of any water <br /> wells within 2000' of the site <br /> WORK IN PROGRESS <br /> The installation ofa monitoring well on the eastside of California Street was start on October 10,2001 <br /> and was stopped after a fiber cable was encountered 38"east of the USA marked location A permit <br /> to move the monitoring well to the parking lane of the street has been issued by the City of Stockton <br /> Work on this monitoring well is scheduled for the second week in November <br /> Please contact this office at 209/368-9381 if any questions arise from this report <br /> Respectfully submitted, <br /> Fo 11 gineeri P4 ESlG' <br /> \ 't <br /> rvin R fet 2 <br /> g1 EXP <br /> cc Mrs Helen Higgin CR ace #16, Stockton CA 95219 <br /> 2 <br />