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KEI-P88-1013 .QR5 August 9, 1993 Page 3 a The analytical results for all of the ground water samples collected from the Unocal monitoring wells to date are summarized in Table 4 . The concentrations of TPH as gasoline and benzene detected in the ground water samples collected this quarter from the Unocal wells are shown on the attached Figure 4 . Copies of the laboratory analytical results and the Chain of Custody documenta- tion for the Unocal samples are attached to this report. As previously reported, a point sampling event was conducted on June 28 , 1993 , with the nearby Montgomery Ward site. The ground water sample analytical results provided by Environmental Audit, Inc. for the Montgomery Ward wells are summarized in Table 5 . The concentrations of TPH as gasoline and benzene detected in the ground water samples collected from the Montgomery Ward wells on June 28 , 1993 , are also shown on the attached Figure 4 . DISCUSSION AND RECOMMENDATIONS In order to comply with a request from the San Joaquin County Public Health Services (SJCPHS) Department, KEI previously recommended the installation of an additional monitoring well as a replacement for former well MW9 . This proposed well, identified as MW14 , is shown on the attached Figure 5. In addition, in order to comply with a request by the SJCPHS to bring well MW6 into active status (well MW6 is currently dry) , KEI recommended that MW6 be destroyed and that a deeper replacement well be installed. This proposed well, identified as MW15, is also shown on the attached Figure 5 . KEI understands that Unocal is continuing to negotiate off-site access permission for these additional wells. Once off- site access agreements and all necessary permits have been obtained, KEI will proceed with the proposed well destruction and installation activities. On May 27 , 3993 , a representative of KEI reviewed the file for the adaacent Montgomery Ward Auto Service Center at the offices of the Regional Water Quality Control Board (RWQCB) , Central Valley Region, in Sacramento, California. The Montgomery Ward site is located at 5400 Pacific Avenue, directly south of and across Robinhood Drive from the Unocal site. A report titled "Phase V Subsurface Investigation" by Environmental Audit, Inc. and dated April 23 , 1993 , was contained in the file. Based on the information contained in this report, in 1986 two underground storage tanks and a waste oil tank were removed from the Montgomery Ward site. In 1988 , four bulk oil underground storage tanks were also removed from the site. The former locations of underground fuel storage tanks and fuel islands are shown on the attached Figure 5 . The former locations of the bulk oil (four) and waste oil (one) tanks are not known to KEI .