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1998. The area beneath the C�I;'s and piping was contaminatedResults of the soil <br /> samples beneath piping samples 3 and 6 are attached, , these samples were collected about 50 <br /> feet from where MW3 was installed. There was soil contamination in MW3 from 30 feet to 70 <br /> feet and there were originally high concentrations of contamination in the groundwater <br /> samples from MW3 . <br /> The UST system removals at the Olive Street site occurred in October 1998. The piping was <br /> above the UST so there are only UST soil samples. <br /> There was minor contamination in the soil samples from the south end of Tank 1. Four soil <br /> borings and a monitoring well have been drilled at the site and there was no soil <br /> contamination in any of the soil samples collected and analyzed. There is groundwater <br /> contamination in samples from MW1 which is about 75 feet from MW3 on the 4075 Main Street <br /> site. <br /> It has mainly been TPH and the concentrations are similar to those of <br /> MW3 except since November 2007 the concentrations in MW1 have decreased. <br /> The consultant had requested review of the site for closure, with the opionion that the <br /> contamination was from 4075 .Main, that the groundwater gradient on the west side of 4075 <br /> Main was east to west and compared <br /> samples from MW5 and MW1. The EHD wrote a letter that the data didn't <br /> support the opinion and requested further work. Since a work plan wasn't submitted it <br /> came to me for an administrative meeting. <br /> I reviewed the 4075 Main Street data and presented what I found to Vicki and Nuel and said <br /> I supported case closure. There is no contaminant source to support that the groundwater <br /> contaminantion is from the UST system at 1030 Olive .and there is contaminant source <br /> information that supports it is from 4075 Main. They agreed with this after I showed them <br /> the information. <br /> Please let me know if you support closure of this site or need additional information. <br /> i <br /> Margaret <br /> James L.L. Barton, P.G. <br /> Engineering Geologist <br /> California Regional Water Quality Control Board. Central Valley Region, 11020 Sun Center <br /> Drive, Suite 200, Rancho Cordova, CA 95670 office (916) 464-4615 <br /> fax (916) 464-4704 <br /> I <br /> 2 <br /> I <br />