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Cal/BPA
<br /> EMORANDUM `.
<br /> + •4,t�
<br /> t CALIFORNIA REGIONAL WATER QUALITY CONTROL BOAR
<br /> CENTRAL VALLEY REGION rye Wi1son,cpVe,nor
<br /> QUAUN God'
<br /> (916)255-3000 0CALNET 8-494-3000 • FAX(916)255-3015
<br /> FROM: Patricia A.Anderson
<br /> TO: Gordon L.Boggs
<br /> SIGNATURE:
<br /> DATE: 30 January 1998 pAPERBOARD
<br /> SUBJECT: RE�W FOR NO FURTHER ACTION REQUIRE')WEST CCHHURS CH BEET,STOCKTON,
<br /> CORP.(GOLD BOND BUILDING PROD
<br /> SAN JOAQUIN COUNTY
<br /> Based on my review of
<br /> the Solvent Tank Site Closure,dated 17 October 1997,and our files,I have noted the following:
<br /> t 1985,two 4,000 gallon diesel tanks were removed from the above site. San Joaquin Public
<br /> Background: E Augur staff noticed no contamination beneath the tanks-
<br /> Health service/Environmental Health Division(ted in 1 EHD)
<br /> Therefore,soil or water samples were not collected in 1985 and no further investigation is being required by
<br /> SJPHS/EHD in 1997.
<br /> anon concrete underground storage tanks,a sump and 700 ft of pipeline with#6
<br /> Prior to ounthere were two 2,500-8 1 Total Extractable Petroleum Hydrocarbons. Further investigation of this
<br /> fuel. Groundwater samples had 1,300 µg/
<br /> 1 area will be the responsibility of the SJPHS/EHD's local oversight program.
<br /> l000-gallon isopropyl alcohol,a 4,000-gallon Toluol,a
<br /> In 1986,six product(a 4,000-gallon isopropyl acetate,a 4, and a 1 000-gallon blanket wash)tanks and two
<br /> 1,500 gallon normal propyl acetate,a 1,000-gallon acetone,
<br /> 3,000-gallon waste ink and solvent(waste ink)tanks were removed from the above site. (Blanket wash contains
<br /> Ccyclohexane,n-heptane,methyl cyclohexane,toluene,isopropenol,parafins and cycloparafins. Toluol contains toluene
<br /> in an alcohol mixture.) The removal of the product tanks,west of the main building,and the waste ink tanks,
<br /> southwest of the.product tanks,created two pits. The isopropyl acetate,blanket wash,and waste ink tanks were rusty,
<br /> but there were no indications of leaks or holes. However,a slight odor was detected in the product tank excavation.
<br /> The waste ink tank excavation contained stained soil and odors. This resulted in an unknown amount of soil being
<br /> excavated from the pits.
<br /> Soil samples,collected beneath the tanks,were analyzed for benzene, chlorobenzenes, ethylbenzene,xylene,and total
<br /> petroleum hydrocarbons(TPH)as gasoline,diesel,and motor oil. The product tank pit had a maximum concentration
<br /> r of 330µg/kg TPH-d, 10µg/kg benzene,3 µg/kg 1,2-dichlorobenzene, 8 µg/kg 1,4-dichlorobenzene,and
<br /> 36 µg/kg toluene. The Waste Ink tank pit had a maximum concentration of 92 µg/kg toluene. Based on this
<br /> information,the pits were backfilled with excavated and clean soil.
<br /> C In January 1997,groundwater occurred at approximately 8-9 feet below ground surface. During the excavation of the
<br /> Ctanks in 1985,groundwater occurred at approximately 20 ft bgs.
<br /> Conclusions: The soil samples from the pit and stockpiled soil were not analyzed for the chemicals stored in the
<br /> Cproduct and waste ink tanks or the byproducts of these chemicals. Therefore,the extent of contamination is unknown,
<br /> and contaminated soil may have been used to backfill the pit.
<br /> C
<br /> Recommendations: Native soil and ground water samples need to be collected in the areas of the former product and
<br /> waste ink tanks. These samples need to be analyzed for volatile and semivolatile organic chemicals,using EPA
<br /> fMethods 8260 and 8270. Based on consultation with our chemist,all chemicals listed under these methods,and the
<br /> peaks of chemicals not listed under these methods must be reported. In addition,all requirements concerning any
<br /> investigation and remedial action must be completed as noted on the checklist.
<br /> C
<br /> Lai .
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