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11/08/1996 08:57 1209832- 52 WRICHT F-WiKUNK 'HL rHU� +� <br /> November 8, 1996 <br /> Project No. 4090 <br /> San Joaquin County Puhl ih'Health Services <br /> Environmental Health Dutton <br /> 304 E. Weber Ave., ThIOI.Floor <br /> PO Box 388, Stmicton, CA 95201.0388 <br /> RE: Work Plan Propodsiti-for 595 K Eleventh Street Site Code: 1933 <br /> Tracy, CA <br /> Dear Ms. Tu rkatte: <br /> The preparation of this wa*plan is in response to a letter request, date stamped July <br /> 26, 1996, from the San Is*in County Public Health Services- Environmental Health <br /> Division (PHS-EUD) f x4il litional groundwater monitoring well installation, and data <br /> collection. <br /> Background <br /> The site is located at 59519hat I lth Street in Tracy, California. Five underground <br /> storage tanks were removesfrom the site in January of 1990. Sail and groundwater <br /> samples collected at thatihne indicated petroleum hydrocarbon contamination (FGL <br /> Environmental, 1990). Simi and groundwater studies by EYAX (1992) and <br /> Remediation Risk h9anagtitent (1993) show that groundwater contamination is moving <br /> away from the former tank kxatious to the north and north-east. Previous excavation <br /> in the tank area appermtly^tiemwmd vadose-wne contaminated soil. <br /> Groundwater moniaming dtta indicates groundwater directional flow to be historically <br /> in a northerly direction fi0in the former tank pit, with some north easterly movement. <br /> Field evidence indict is 1tit the migration in the aquifer has occurred along or just <br /> below the capillary frinpes A dissolved plume has moved to the north and crossed the <br /> Tracy High School propeM line, the dowagradient edge of which has been defined. A <br /> subsurface irrigation line Occurs on both the Tracy High and Cox and Cox properties <br /> and may have influoumdph= migration to the north, somewhat along the pipeline <br /> course. The north-eastern plume extent is interpreted to be under the railroad tracks <br /> between the Heinz, and Cent and Carr properties. A relatively slow groundwater <br /> movement is infernd f*W*e groundwater monitoring data. Overall site groundwater <br /> movement is consistently Lo the north. <br /> Technical Approsch <br /> COX&Cox D94" Hvjecr Na 4090 D)UPT I'age I <br />