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` --GAW- <br /> CENTRAL VALLIfREGIONAL WATER QUALIT#CONTROL BOARD <br /> INSPECTION REPORT <br /> DISCHARGER: Arcady Oil Co. <br /> LOCATION & COUNTY: Holt, San Joaquin County <br /> CONTACT(S) : Al Kisner, caretaker; Alex Diepenbrock, owner <br /> INSPECTION DATE: 23 May 1989 <br /> INSPECTED BY: Robert L. Niblack <br /> ACCOMPANIED BY: Phil Guadagnino, Mike Negrete <br /> This inspection was conducted to sample monitoring wells at the Arcady Oil Company <br /> drilling mud disposal site to begin to determine if waste constituents are migrating <br /> from the site. An ongoing monitoring program is needed to confirm the results of <br /> this sampling event. Until this inspection was conducted, existing monitoring wells <br /> at this site had not been sampled and analyzed since 21 October 1987. The , <br /> monitoring wells we planned to sample during this inspection were those on the south <br /> end of the site. Hazardous levels of metals were found onl ' from the <br /> south end of the site. Hazardous levels of lead were found in the drilling mud <br /> samples, and hazardous levels of copper were found in samples of soil beneath the <br /> waste. The north end ofmthe site was polluted with hydrocarbons due to a pipeline <br /> leak in 198M The hydrocarbon contamination at the northern end of the site is <br /> undergoing remediation by Southern Pacific Pipeline Company. <br /> MONITORING WELL CONSTRUCTION AND DESIGN <br /> The southern monitoring wells are M-3, M-4, M-5, M-6, M-7, M-8, and OH-2. The <br /> location of these wells is shown on figure 1 (attached) . <br /> Monitoring well OH-2 was constructed when the site was still accepting wastes. Two <br /> six-inch, steel cased wells, OH-1 and OH-2, were installed along the eastern <br /> perimeter of the property in 1982 or early 1983. <br /> On 29 April 1985 ten additional monitoring wells were installed to comply with a <br /> cleanup and abatement order. The ten wells were each constructed of four-inch PUC <br /> casing with ten feet of slotted screen. Of these ten wells M-3, M-4, M-5, M-6, M-7, <br /> and M-8 were checked during this sampling event. The depth of these wells was from <br /> 18 to 20 feet below ground surface when constructed. When measured during this <br /> inspection the bottom of the wells was from 17.95 to 18.75 feet below ground <br /> surface. M-3 and M-4 are on a levee approximately 30 to 40 feet from the water in <br /> Whiskey Slough. They were considered to be upgradient since the gradient was shown <br /> to be from the slough to the east, and the waste disposal area is east of the wells <br /> (see figure 1) . Water level measurements taken during this inspection confirm that <br />