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Chronology <br /> Formerly Ragu and Van den Bergh Foods <br /> Currently Lipton <br /> 1400 Waterloo Road <br /> Stockton CA <br /> Site Code: 22073 <br /> The site is located on 141-150-02 and consists of a product storage area and a tomato canny facility. The site has <br /> undergone a number of name changes reflective of corporate ownership or corporate prerogative. There are two <br /> well on site which provide processing water. Well#1 was drilled beginning on January 18, 1955 to a total depth of <br /> 440 feet below ground surface(bgs)with perforations from 434-76 feet bgs. Well#2 was drilled beginning on <br /> June 12, 1959 and constructed to a total depth of 430 feet bgs with perforations from 410 - 142 feet bgs. Well 91 is <br /> located closest to the remaining soil contamination and is approximately 250 feet north. Well logs and a facility <br /> map is attached. Four underground storage tanks were located in two areas on the site. The unauthorized release <br /> was related to tanks 92 -44 which were removed on June 26, 1986 from a common excavation. A soil and <br /> groundwater investigation ensued which included limited secondary source removal. The limited excavation on <br /> May 1 and 2, 1995 removed 330 cubic yards of contaminated soil. Fifteen groundwater sampling event were <br /> conducted with MW4. The maximum groundwater contamination was evidenced in the sample collected on <br /> August 7, 1995 from MW6 of 210 ppb TPH-diesel. The remaining soil contamination is limited to volume of 630 <br /> cubic yards with 1,203 pounds of TPH-diesel. The Vleach Model was used to estimate the potential impact which <br /> the remaining soil may have on groundwater quality. The model results indicated that the maximum impact <br /> expected was 44 ppb TPH-diesel in 25 years. Dan Wynne,California Registered Geologist 94523,currently with IT <br /> Corporation,recommended that the monitoring wells be destroyed and the site be certified to require no further <br /> action, based on available information. PHS/EHD concurs with this recommendation. <br /> 1986 <br /> 6/26/86 Three underground storage tanks(UST)were removed. Soil samples were collected from beneath <br /> USTs#2-#4 by American Environmental Management Corporation and analyzed by Eureka <br /> Laboratories. <br /> 11/4/86 Tank#1 was removed and additional soil was excavated from the Tank#2-#4 pit. Sample#A-1 was <br /> collected at 20 feet bgs from beneath Tank#1 and samples B 1 (14 feet bgs western end)and B2(12 <br /> feet bgs eastern end)were collected from Tank 42-94 pit. <br /> 1987 <br /> 3/30/87 Three soil borings(R1 -R3)were drilled to a total depth of 30 feet below ground surface(bgs)and <br /> soil samples collected. See the attached Summary of Soil Analytical Data <br /> 1988 <br /> 6114/88 The installation of three monitoring wells was initiated. See the attached well logs and summary of soil <br /> analytical data. Seven soil samples were collected during the installation of the monitoring wells. <br /> Groundwater samples were collected on August 19, 1988,after well development,which did not <br /> contain detectable petroleum hydrocarbons. The depth to waster was 56.04 feet in MW 1, 55.26 feet in <br /> MW2, and 52.62 feet in MW3. <br /> 1989- 1991 <br /> No Activity <br /> 1992 <br /> 10/12/92 Drilled and sampled soil boring B-1 to assess vertical extent of the soil contamination. See the <br /> attached boring log and Summary of Soil Analytical Data. <br /> 10/19/92 Drilled and sampled the soil boring which was subsequently converted into monitoring well MW4. <br /> Existing monitoring wells, MW 1 -MW3 were dry(total depths approx. 64 feet and current <br /> groundwater depth-81 feet). See the attached boring log and Summary of Soil Analytical Data. <br /> Regular groundwater monitoring was initiated following the installation of MW4. <br />