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' Boyett Petroleum January 22, 2001 <br /> 419 Main Street,Manteca, CA <br /> Quarterly Groundwater Sampling Report <br /> • December, 2000 <br /> Well TPH- B T E X MTBE ETH BTA DIPE ETBE TAME EDB 1,2- <br /> ' Gas* DCA <br /> MW-1lf' 9 ND ND ND ND $$Q[}' ND ND ND ND 28: ND ND <br /> MW-2 ....i► ...... i 2. 1 ND ND ND ND ND ND ND ND <br /> ' MW-3 ND ND ND ND ND 3i1 ND ND ND ND ND ND ND <br /> MW-4 ;O:I .....;0 7......;0 5 1,8 15 - 110:> ND ND ND ND ND ND ND <br /> MW-5 €1fKJ... ...2 1........ ......:: .7.... . 1 ....:> 1. > ' ND ND ND ND ND ND ND <br /> MW-6 ND $ 0 4 4. ND4.s ND ND ND ND ND ND ND <br /> ' MW-7 ND :.':. > . .: �i0 .:.; ND L.Z....;.: ND ND . ....:: ND ND <br /> 8 3_.. ND U. <br /> MW-$ I ND ND ND ND ND ND ND ND ND ND ND ND ND <br /> BTEX—Benzene,Toluene,Ethyl Benzene,Xylenes <br /> MTBE—Methyl Tert Butyl Ether <br /> ETH—Ethanol <br /> ' BTA—Tert-Butanol <br /> DIPE—Di-Isopropyl Ether <br /> ETBE—Ethyl TertButyl Ether <br /> TAME—Tert-Amyl Methyl Ether <br /> ' EDB—Ethylene Dibromide <br /> 1,2-DCA—1,2 Dichloroethane <br /> ND-"None detected" at or above reporting limit <br /> *Reported in mg/L. All other analytes reported in ug/L <br /> 1 MW-1 contained 8,800 ug/L of MTBE, a decrease from last quarter's sampling event, in <br /> September, 2000, in which MW-1 had a concentration of 11,000 ug/L. MW-1 also <br /> showed a decrease in the other analytes tested for since last quarter. MW-2 showed a <br /> decrease in all analytes tested for, including MTBE, which was "none-detected" in this <br /> quarter's sampling event and 25 ug/L in last quarter's sampling. MW-3 and MW4 <br />' showed significant decreases for all analytes tested. This is the first quarter's sampling for <br /> MW-5, 1NIW-6, MW-7, and MW-8. All monitoring wells were sampled on December 29, <br /> 2000, except for MW-8, which was sampled on January 16, 2001. Water depth <br />' measurements for all of the monitoring wells, which was used to calculate the gradient, <br /> were conducted on January 16, 2001. <br />' Pasty analytical data are listed in Table 2 for comparison. Appendix A contains the <br /> .laboratory analytical data and Chain of Custody report. <br />'. The monitoring wells will be measured, purged and sampled again next quarter, and a <br /> new gradient calculated. <br /> 2 <br />