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KEI-P88-1013 .QR6 November 10, 1993 Page 3 The analytical results of 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 documentation for the Unocal samples are attached to this report. As previously reported, a point monitoring and sampling event was conducted on September 29 , 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 September 29 , 1993 , are also shown on the attached Figure 4 . DISCUSSION AND RECOMMENDATIONS Based on the analytical results of the ground water samples collected and evaluated from the Unocal site to date, and based on no evidence of free product or sheen in any of the Unocal wells, KEI recommends the continuation of the current ground water monitoring and sampling program. The Unocal monitoring wells are currently monitored and sampled on a quarterly basis. The results of the monitoring and sampling program will be documented and evaluated after each monitoring and sampling event, and recommenda- tions for altering or terminating the program will be made as warranted. 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 still continuing to negotiate off-sate 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 well installation activities.