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KEI-P88-1013 .QR4 April 19 , 1993 Page 3 DISCUSSION AND RECOMMENDATIONS Based on the monitoring data (ground water level and free product measurements) collected and evaluated to date, KEI recommends a modification to the current monthly ground water monitoring program. The ground water flow direction has consistently been towards the south-southeast to the east-northeast for the past four quarters (June 1992 through March 1993) . In addition, no free product or sheen has been detected in any well to date. Therefore, KEI recommends that the monitoring frequency for all of the wells be reduced from monthly to quarterly. The wells will continue to be sampled on a quarterly basis. 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 well, identified as MW14 , is shown on the attached Figure S . 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 well, identified as MW15 , .is also shown on the attached Figure 5 . KEI understands that Unocal is currently negotiating off-site access permission for this additional work. Once off-site access agreements and all necessary permits have been obtained, KEI will proceed with the proposed well destruction and installation work. As previously reported by KEI, additional monitoring wells in the apparent downgradient direction of the former Unocal site are not recommended at this time. A Montgomery Wards ' auto repair facility occupies the parcel (across Robinhood Drive) in the apparent downgradient direction of the site. As noted in KEI ' s report (KEI- P88-1013 .R2) dated July 15, 2992 , a previous inspection of the Montgomery Wards ' site revealed areas of concrete and asphalt disturbances that appeared to be the locations of former pump islands and underground storage tanks. KEI understands that Mr. Michael Infurna of the SJCPHS is requiring that Montgomery Wards perform an environmental investigation on their site because of contaminants that have been detected in the vicinity of the former pump islands and underground tanks. KEI will review the technical report for the Montgomery Wards ' site when it becomes available, and will make additional recommendations pertaining to the Unocal subsurface investigation as warranted. DISTRIBUTION . A copy of this report should be sent to SJCPHS, and to the Regional Water Quality Control Board, Central Valley Region.