SITE INFORMATION AND CORRESPONDENCE

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Margaret Lagorio [EH] To: Jim Barton Cc: Vicki McCartney[EH]; Nuel Henderson [EH] Subject: 1030 S. Olive Street, Stockton Attachments: Scanned_.pdf; Scanned_.pdf Em Scanned_.pdf(343 Scanned_.pdf KB) Jim, Please review the above site information from 4075 Main Street and 1030 Olive Street which are adjacent to each other. The Main Street site UST system removals occurred in December 1998. The area beneath the UST' s and piping was contaminated. Results of the soil samples beneath piping samples 3 and 6 are attached, these samples were collected about 50 feet from where MW3 was installed. There was soil contamination in MW3 from 30 feet to 70 feet and there were originally high concentrations of contamination in the groundwater samples from MW3 . The UST system removals at the Olive Street site occurred in October 1998. The piping was above the UST so there are only UST soil samples. There was minor contamination in the soil samples from the south end of Tank 1. Four soil borings and a monitoring well have been drilled at the site and there was no soil contamination in any of the soil samples collected and analyzed. There is groundwater contamination in samples from MWI which is about 75 feet from MW3 on the 4075 Main Street site. It has mainly been TPH and the concentrations are similar to those of MW3 except since November 2007 the concentrations in MW1 have decreased. The consultant had requested review of the site for closure, with the opionion that the contamination was from 4075 Main, that the groundwater gradient on the west side of 4075 Main was east to west and compared samples from MWS and MW1. The EHD wrote a letter that the data didn't support the opinion and requested further work. Since a wont plan wasn't submitted it came to me for an administrative meeting. I reviewed the 4075 Main Street data and presented what I found to Vicki and Nuel and said I supported case closure. There is no contaminant source to support that the groundwater contaminantion is from the UST system at 1030 Olive and there is contaminant source information that supports it is from 4075 Main. They agreed with this after I showed them the information. Please let me know if you support closure of this site or need additional information. Margaret t I .;