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Mr Harlan Knoll February 11, 1992 RE Heinz Facility - Tracy Page 2 The water samples collected from wells MW2 and MW3 were analyzed for benzene, toluene, ethylbenzene, xylenes (BTEX), by EPA method 8020, total petroleum hydrocarbons as gasoline (TPHG), and total petroleum hydrocarbons as diesel (TPHD) by modified EPA method 8015 Dissolved petroleum hydrocarbons were not detected in either MW2 and MW3 Analytical data 1s presented on Table 2 The laboratory data sheet, chain-of-custody, and monitoring data are included as Attachment 1 Since the area has been newly capped with asphalt and most of the contaminated soil has been removed, any remaining contaminated vadose soils would not appear to be a significant threat to groundwater Therefore additional excavation is not warranted, particularly considering the physical restrictions involved RESNA Industries, in conjunction with our client, has attempted to locate the missing monitoring well (MW1) but was unsuccessful A 150 square foot area was excavated in an attempt to locate the well Also a metal detector was utilized in an attempt to locate the well on two separate occasions We do not believe further action toward locating the well is warranted (correspondence to San Joaquin County Public Health Services dated January 30, 1992) The next monitoring will take place in March of 1992 We will again include gradients from the three previously mentioned sites to verify the local gradient direction A monitoring report will be submitted when all the sampling analytical results are received If you have any questions or comments please contact me at our Escalon office at 2091838-3507 Respectfully, RESNA Industries Lois Frantz Staff Geologist Vul, u- L-Zra Nora H Kataoka CA Registered Civil Engineer No 38322 LF/gk Attachments PC Nick Kosta, BJJ Trucking RWQCB - Central Valley Region, Jim Maughan LR013192 LF