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EPA describes S -. sites
<br /> Proposed for .h lists
<br /> The Associated Press substances at:,the depot, Water
<br /> from Tracy's_nunicipal well,
<br /> Here are the Environmental which is within three miles of the
<br /> Protection Agency's descriptions site, is blended with water from
<br /> of the two San Joaquin County other wells and from Delta Men.
<br /> sites proposed Thursday for in- dota Canal to provide drinking
<br /> clusion on its list of the nation's water to an estimated 28,600 peo-
<br /> worst hazardous waste sites: pie
<br /> Tracy Defense Depot
<br /> The Defense Logistics Agency
<br /> The depot covers 448 acres 144 is conducting a study-to deter-,
<br /> miles southwest of Tracy, sur- mine the type and extent of con
<br /> rounded primarily by grassland lamination at the depot and iden
<br /> and agricultural crops.Special op- tify possible remedial action. The
<br /> erations include repacking leak- study is scheduled to be-com=
<br /> ing chemical containers, fumiga pieted in mid-1990.. The state fs
<br /> tion of shipping materials,vehicle reviewing the depot's proposal to
<br /> maintenance, painting, storage of undertake an interim remedial
<br /> chemicals,derusting and preserv- measure involving pumping out
<br /> Ing of metal parts, operation of contaminated.groundwater and
<br /> chemical and photographic labo- treating it to,remove the contami-
<br /> ratories, storage and mixing of nation.
<br /> pesticides and storage and treat-
<br /> ment of liquid and solid wastes. Lawrence Livbrmore
<br /> Liquid waste treatment/storage National Lab (Site 300)
<br /> areas include two unlined sewage.
<br /> effluent ponds, two abandoned Site 300 covers approximately ,
<br /> sewage lagoons, two lined indus- 2.75 square miles north of Corral
<br /> trial waste water ponds, an aban- Hollow Road, straddling the Ala-
<br /> doned paint spraying/stripping meda-San Joaquin County line,
<br /> rinse water pond, an abandoned The area is rural. The main Law.
<br /> trench where 150 drums of lubri- rence Livermore complex,located
<br /> cating oil reportedly were buried, 15 miles west of Site 300, was
<br /> an unlined pond for holding placed on the list in July 1987.
<br /> storm water, an abandoned pesti- Site 306's primary mission
<br /> cide disposal trench, an aban- since its inception in 1955 has
<br /> doned area where substantial been to test high explosives. It
<br /> amounts of Formaldehyde were has also operated a number of
<br /> buried,and above-ground and be- solid waste landfills, accepting
<br /> low ground waste tanks. waste from the main Laboratory
<br /> Also, liquid wastes were for- site, Site 300, and Lawrence Ber-
<br /> merly stored in an unpaved stor- keley Laboratory. Land disposal
<br /> age area,and hazardous materials ceased at Site 300 in November
<br /> — including solvents,rhdiological 1988• Site 300 also formerly main-
<br /> commodities, medical supplies tained a number of waste lagoons
<br /> and solid and liquid chemicals — and dry wells for the disposal of
<br /> were disposed of in three burning liquid wastes and waste waters.
<br /> pits. The dry wells have been removed
<br /> from service, and the lagoons
<br /> Former solid 'waste treatment/ have been replaced by two dou
<br /> storage areas include a fill area ble-lined surface impoundments.
<br /> where food items were buried, a The lagoons are scheduled to be
<br /> fill area where construction capped in the summer of 1989.
<br /> material was buried and three im- Tests conducted :in 1983 b a
<br /> poundments where wastes con- contractor detectedtrichlorceth
<br /> taining mercury phosphate com- y-
<br /> pounds were stored. Currently,all lene (TCE), trans-1,2-dichloroe-
<br /> solid hazardous waste is haule- thylene and tetrachloroethylene
<br /> off-site. in on-site monitoring wells. The
<br /> soil is also contaminated.TCE is
<br /> Tests conducted in 1985 used as a cooling and heating
<br /> showed that the shallow aquifer agent to test the stability, of va
<br /> below the site, which extends rious high explosive compounds
<br /> from 15 feet to 250 feet below the and is stored for distribution
<br /> surface, is contaminated with through above-ground piping. A
<br /> .trichloroethylene and tetrachlo- leak was suspected as the source
<br /> roethylene. The water in the of soil and groundwater contami-
<br /> aquifer, however, is generally too nation. Approximately 350 people
<br /> saline for most uses. Municipal, obtain drinking water from wells
<br /> private and irrigation wells are within three miles of Site 300,
<br /> within three miles of hazardous most of them on Site 300 itself.
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