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12 April 2006 i AGE-NC Project No. 97-0301 tPage 6 of 7, DCA plume is not laterally assessed toward the southeast beyond well MW-9A. However, ' as of this quarter, the 1,2-DCA plume is undefined to the northeast due to detection at MW-10A. ' 1,2-:DCA concentrations in ground water samples MW-1, MW-7, MW-9A and MW-10A were detected above the MCL's in drinking water. 1 5.0. RECOMMENDATIONS Based upon data collected during the 4" Quarter 2005, AGE recommends: ' • In accordance with a SJCEHD letter dated 08 August 2005, AGE will remove total petroleum hydrocarbons quantified as motor oil (TPH-mo) from the analytical list of compounds for all monitoring wells. • In accordance with a SJCEHD letter dated 10 October 2005,AGE will reduce the monitoring frequency at wells MW-2, MW-3, MW-6 and MW-11 from quarterly to annual; annual . monitoring events will be performed during the 4`h quarter of each calendar year. � • Continued quarterly ground water monitoring utilizing wells MW-1,MW-4,MW-5 through �N-o r ' MW-10 and MW-12;the first quarter 2006 ground water monitoring event is scheduled for ' 20 March 2006. • If applicable,conduct future ground water monitoring events concurrently with the Cal-Tank ' Lines site (3105 South EI Dorado Street). • Installation of additional `shallow' ground monitoring wells may be warranted southeast of well MW-9A and northeast of MW-I OA to completely define the First Water Zone dissolved , TPH-g and 1,2-DCA plumes. • AGE has begun preparation of a site conceptual model(SCM)in accordance with a SJCEHD ' recommendation in a letter dated 08 August 2005.AGE anticipates completion of the SCM by April 2006. ' • Preparation of a corrective action plan (CAP) in accordance with Article 11, Chapter 15, UST Regulations,The CAP will assess a minimum of three remedial alternatives for soil and ground water at the site. ' Advanced GeoEnvironmental,Inc.