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i <br /> d 1 <br /> CHRONOLO Y <br /> BROPHY PROP TY <br /> 941 EAST YOSEMI E AVENUE <br /> MANTECA CALIFORNIA <br /> 02-11-88 Five USTs removed this date: four 1, 000 gallon unleaded, <br /> super unleaded, regular and diesel and one 500 gallon <br /> waste oil. PHS/EHD fiell notes state tanks in good <br /> condition. Soil samples were collected at 16 ' BGS for <br /> the fuel tanks and 7 ' BGS for the waste oil tanks. The <br /> samples from under the fuel tanks revealed total volatile <br /> hydrocarbons and xylene under all four tanks. Total <br /> volatile hydrocarbons were detected also under the waste <br /> oil tank at 5. 1 ppm. Benzene and toluene were not <br /> detected at detection liixits of 0.2 ppm and 2 . 0 ppm. <br /> Ethylbenzene was not tested for in these soil samples . <br /> EDB was not detected undez the regular gasoline tank at <br /> a detection limit of 0 . 2 rpm, but a total lead value of <br /> 6. 95 ppm was detected. <br /> 03-14-88 Overexcavation of the former fuel tank area and soil and <br /> grab water sampling this date at 18 ' and 20 ' BGS, <br /> respectively. Approximately 10 cubic yards of soil was <br /> removed from the excavation. The soil sample revealed <br /> xylene and total volatile petroleum hydrocarbons at 290 <br /> ppm and 580 ppm, respectively. Benzene and toluene were <br /> not detected at a detection limit of 200 .0 ppm. EDB was <br /> non detect at a detection limit of 20 .0 ppm and total <br /> lead was detected at 29 . 5 ppm. <br /> Groundwater was encountere I at 191 BGS. The water sample <br /> showed toluene and xyl ne at 0 . 06 and 0 . 63 ppm, <br /> respectively. Benzene and total volatile petroleum <br /> hydrocarbons were not detected at 0. 05 ppm and 2 . 0 ppm, <br /> respectively. Lead and EDII was not detected at detection <br /> limits of 0 . 005 ppm and 0, 05 ppm, respectively. <br /> 10-27-88 The three MWs at the site were sampled this date. No <br /> depth to water measurements recorded for this round of <br /> sampling. All three wells showed levels of hydrocarbons <br /> during this sampling round, with the highest <br /> concentrations in MW#2 with benzene at 3 . 6 ppb. MW#1 is <br /> located approximately 401 directly north of the former <br /> tank pit area and 95 ' north east of the former dispenser <br /> area. MW#2 is located approximately 601 north west of <br /> the former tank pit area and approx. 75 ' form the former <br /> dispenser area. MW#3 is located approx. 71 directly <br /> south of the former tank pit area and approx. 50 ' to the <br /> east, north-east of the former dispenser island. <br /> 01-03-89 Three MW1s drilled this date. The two soil samples <br /> collected at 111 and 21 ' BGS from MW#1 showed TPH as <br /> gasoline at 23 ppm and 2 ppm, respectively. BTEx at <br />