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Mr Harlan Knoll May 04, 1992 <br /> RE Heinz Facility - Tracy Page 2 <br /> The water samples collected from wells MM2 and MW3 were analyzed for benzene, toluene, <br /> ethylbenzene, xylenes (BTEX), by EPA method 8020, total petroleum hydrocarbons as gasoline <br /> (TPHG), and total petroleum hydrocarbons as diesel (TPHD) by modified EPA method 8015 <br /> Dissolved petroleum hydrocarbons were not detected above method detecion limits in either <br /> MW2 nor MW3. Analytical data is presented on Table 2 The laboratory data sheet, chain-of- <br /> custody, and monitoring data are included as Attachment 1 <br /> Since the area has been newly capped with asphalt and most of the contaminated soil has been <br /> removed, any remaining contaminated vadose soils would not appear to be a significant threat <br /> to groundwater Therefore additional excavation is not warranted, particularly considering the <br /> physical restrictions involved <br /> RESNA Industries, in conjunction with our client, is considering implementing the use of a <br /> ground penetrating radar to attempt to locate the missing monitoring well (MW1) Thus far our <br /> client has excavated 150 square foot area and utilized a metal detector in an attempt to locate <br /> the well <br /> The next monitoring will take place in July of 1992 We will again include gradients from <br /> several nearby previously mentioned saes to verify the local gradient direction A monitoring <br /> report will be submitted when all the sampling analytical results are received <br /> If you have any questions or comments please contact me at our Escalon office at 209/838-3507 <br /> Respectfully, <br /> RESNA Industries <br /> Lois Frantz <br /> Staff Geologist <br /> Nora H Kataoka <br /> CA Registered Civil Engineer No. 38322 <br /> LF/gk <br /> Attachments <br /> PC: Nick Kosta, WJ Trucking <br /> RWQCB - Central Valley Region, Jim Maughan <br />• LR050492 LF <br />