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r Table 1 HISTORICAL GROUNDWATER ANALYTICAL RESULTS AND MONITORING DATA • FORMER CHEVRON SERVICE STATION NO 9-0342 1347 SOUTH ELDORADO,STOCKTON,CALIFORNIA WELL 1D/ ETHYL- FECAL ELEVATION BENZENE TOLUENE BENZENE XYLENES TPH-G COLIFORM DTW SPT WTE C DATE b b b b b m n fee; feet feet MW-1 1166 06/20/90 05 NO NO NO 810 -- 4059 000 -2893 01/09/91 ND 0.8 ND NO 180 -- 42.86 000 -31.20 04/05/91 NO NO NO to 96 -- 4335 000 -3169 07A"i NO ND NO 07 68 -- 4433 000 -32167 10/29/91 NO NO NO ND ND -- 4526 0 DO -3360 01/14192 NO ND ND NO NO -- 4529 0 OD -3363 05/04/92 - -- -- -- -- -- 4387 0 DO -3221 07/22192 No. ND ND ND 82* -- 4542 000 -3376 10/26/92 - -- -- - - -- 4696 000 -3530 02!16193** - - -- - - - - - 05/17/93** -- -- -- -- -- -- 17/93** - -- -- -- -- - - -- -- MW-2 1209 08/20/90 ND NO ND ND NO -- 4081 000 -2672 01/09/91 NO Np NO ND ND - 42.98 0 00 -3089 04/05/91 NO ND NO ND NO -- 4350 000 -3141 07125191 ND ND ND ND NO - 4457 000 --3248 10/29/91 NO ND ND ND NO - 4548 000 -3339 01114/92 ND NO NO ND ND - 4547 000 -33.38 05/04/92 -- -- - -- -- -- 4410 000 -3201 07/22192 NO ND NO NO NO -- 4567 0 DO -3358 10/26/92 - -- -- - - -- 4720 000 -3511 02116/93 ND NO NO ND NO - 4598 000 -33 89 05/17/93** -- -- -- - -- -- - -- -- . MW-3 - 11 91 0e/20190 89D 9 66 is 15,0oo 3941 000 -2750 01/09191 18 2.3 2.2 49 380 -- 4313 000 -31.22 04/05/91 8 07 1 3 170 -- 4364 000 -3173 07/25191 15 ND 10 2.5 190 NO 4457 000 -3266 10/29/91 63 0 e 25 35 360 -- 4551 000 -3360 01114/92 14 3.8 68 95 780 -- 4552 000 -3361 05/04/92 57 37 11 26 520 -- 4413 000 -3222 07122/92 NO ND 55 44 230 -- 4565 000 -3374 10/26/92 30 05 20 30 450 - 4718 000 -3527 02116/93 NO 1.0 160 140 1.500 - 4607 000 -3416 05/17/93 73 19 37 85 1.000 -- 4320 000 -3129 08/17/93 NO NO 59 NO 310 -- 4344 000 -31.53 MW--4 1181 07/25/91 NO NO NO NO NO 220 4456 000 -3275 10/29/91 NO. NO NO ND ND - 4552 000 -3371 01/14/92 NO NO NO NO NO - 4551 000 -3370 05/04/92 22 ND 06 17 120 - 4409 000 -3228 07/22/92 NO NO ND NO NO -- 4564 000 -3383 10/26/92 NO ND NO ND NO - 47.20 000 -35.39 07116/93 NO NO NO NO NO -- 4607 0 DO -3426 05/17/93 4.6 10 4.8 28 320 -- 4390 000 -3209 08/17/93 ND ND,-- ND, NO , NO , 43 47 0 00 -31 66 EXPLANATION All elevations are given in feet relative to mean sea level ppb= parts per billion or micrograms per Inter jug/L TPH-G-Total Petroleum Hydrocarbons as gasoline(ppb) mpn= most probable number per 100 milliliter * = Chromatograph does riot match typical gasoline pattern NO = Not detected at or above the minimum quantitation limd ** - Well could not be ioeated -- = Not analyzed not sampled SP= Separate-phase petroleum hydrocarbons NOTE See laboratory reports for minimum quantitation limit DTW= Depth to water MW-3 and MW-4 are sampled quarterly MW-1 and MW-2 SPT= Separate-phase hydrocarbon thickness are sampled in 1 sl and 3rd quarter WTE = Water table elevation TOC =Top of casing ` WTABi WKi GROUNDWATER ��TECHNOLOGY