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} Site History Boyett Petroleum(419 S.Main St.,Manteca) Page 5 of 5 In the First.Quarter Groundwater Monitoring Report, March 2003 Condor recommended the preparation of a problem assessment work plan (PAWP) to further investigate the lateral and vertical extent of groundwater contamination at the site; and the completion of a door-to-door survey of potential receptors within the residential area of the site to attempt to identify the presence of pumping wells in the site vicinity. On May 15, 2003, a meeting was held at the SJCEHD offices between Condor and SJCEHD representatives to discuss Condor's recommendations and address concerns the SJCEHD had regarding the site. In a letter dated May 29, 2003, the SJCEHD directed the submittal of two individual work plans to install, test, and operate an interim remediation system and to adequately define the lateral and vertical extent of the contamination plume at the site.The SJCEHD agreed with Condor's recommendations to(1) conduct a door-to-door survey of potential receptors, (2) redevelop MW-1, MW-2, MW-3, MW-6, MW- 7,MW-8, and MW-9, (3)destroy both damaged and consistently dry wells MW-4 and MW-5, and replace MW-4 with a new monitor well in the same area, and (5) conduct a monthly monitoring and sampling schedule over a consecutive six month period to characterize the fluctuation of MTBE concentrations in groundwater. In addition, the SJCEHD recommended that the design of MW-1 be reviewed within the context of a site conceptual model to determine if MW-1 potentially creates a vertical conduit between lithologic units and to submit a work pian for well replacement if appropriate. At the direction of the SJCEHD, Condor submitted an Additional Groundwater Investigation Work Plan, dated June 25, 2003, and an Interim Remediation Work Plan, dated June 25, 2003, to the SJCEHD and CRWQCB. The Additional Groundwater Investigation Work Plan was prepared to describe proposed groundwater investigation activities to evaluate the lateral and vertical extent of petroleum hydrocarbon contamination in groundwater up-gradient and down-gradient of the UST area using direct push boring methods. The Interim Remediation Work Plan addresses the installation of a pump and treat system for interim remediation, and the destruction of MW-4 and MW-5 and the installation of a replacement monitor well for MW4. PA3761 Boyett Manteca13761 Boyett Manteca\QMPsUune 20031Boyett Manteca Site History.doc