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Table 1 • HISTORICAL GROUNDWATER ANALYTICAL RESULTS AND MONITORING DATA CHEVRON SERVICE STATION NO 9-0342 1347 SOUTH ELDORADO,STOCKTON CALIFORNIA WELL IDI ETHYL— FECAL ELEVATION BENZENE TOLUENE BENZENE XYLENES TPH--G COLIFORM DTW SPT WTE OC DATE b b b b b m n feet feet feet MW-1 11 66 08/20/90 05 NO NO NO 810 4059 000 —2593 01/09191 NO 08 NO NO 180 —— 4286 000 —3120 04/05/91 NO NO NO 10 96 — 4335 000 —3169 07/25/91 NO NO NO 07 68 -- 4433 000 —3267 10/29/91 NO NO NO NO NO - 4526 000 —3360 01/14/92 NO NO NO NO ND -- 4529 000 —3363 05/04/92 —— —— —— — —— —— 4387 000 —3221 MW-2 1209 08/20/90 ND NO NO ND NO -- 4081 000 —2672 01/09/91 NO ND NO NO NO - 4298 000 —3089 04/05/91 NO NO NO ND NO —— 4350 000 —3141 07/25/91 NO NO NO NO NO —— 4457 000 —3248 10/29/91 NO NO NO NO NO —— 4548 000 —3339 01/14/92 NO NO NO NO NO — 4547 000 —3338 05/04/92 -- -- — -- -- -- 4410 1 000 —3201 MW-3 11 91 08/20/90 890 9 68 14 15000 —— 3941 000 —2750 01/09/91 18 23 22 49 380 —— 4313 000 —31 22 04/05/91 8 07 1 3 170 -- 4364 000 —3173 07125/91 15 NO 1 0 25 190 NO 4457 000 —32.66 10/29/91 63 08 25 35 360 — 4551 000 —3360 01/14192 14 38 68 95 780 —— 4552 000 —3361 05/04/92 57 37 11 26 520 -- 44131 000 —3222 MW-4 1181 07/25/91 NO ND ND NO NO 220 4456 000 —3275 10129/91 NO NO ND NO NO — 4552 000 —3371 01/14/92 NO NO NO NO NO —— 4551 000 —3370 05 04 92 22 NO 0 6 1 7 120 4409 000 —3228 All elevations are given in feet relative to mean sea level TPH—G =Total Petroleum Hydrocarbons as Gasoline(ppb) SP= Separate—phase petroleum hydrocarbons DTW= Depth to water SPT= Separate—phase hydrocarbon thickness WTE = Water table elevation TOC = Top of casing ppb = parts per billion or micrograms per liter pg/L mpn = most probable number per 100 milliliter NO = Not detected at or above the minimum quant4tation limit -- = Not analyzed not sampled NOTE See laboratory reports for minimum quantitation limit GARTAB1 WKi � C�►� GROUNDWATER TECHNOLOGY