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' Quarterly Report - Fourth Quarter 2003 PACIFIC CAR WASH ' 4405 Pacific Avenue, Stockton, California ' 1.0. INTRODUCTION Advanced GeoEnvironmental,Inc (AGE)has prepared this quarterly report for 4405 Pacific Avenue (the site), Stockton, California The scope of work included conducting a quarterly ground water monitoring event and preparation of this report The objectives were to characterize, assess and ' monitor concentrations of petroleum hydrocarbons in ground water and to characterize ground water flow direction and gradient at the site The site setting is illustrated in Figure 1 Site structures and monitoring well locations are depicted in Figure 2 rThis report is prepared in accordance with guidelines issued by the California Regional Water Quality Control Board-Central Valley Region(RWQCB)for investigation of underground storage ' tank(UST)sites A summary ofprevious investigations at the site was included in the AGE-prepared Preliminary Site Investigation and Evaluation Report - January 1997, dated 15 January 1997, ground water monitoring data acquired to date is included in the tables of this report Previous soil characteristics data obtained by Cone Penetrometer Testing (CPT) and during soil • boring/well drilling enabled AGE to define five informal hydrogeoloDe units (Multi-Level ' Monitoring Well Installation Report -- Fourth Quarter 2003, dated 10 May 2004) The informal hydrogeologic units were defined as First Water Zone(15-45 feet bsg),First Confining Unit(45-70 feet bsg), Second Water Zone(70-95 feet bsg), Second Confining Unit(95-115 feet bsg) and Third Water Zone (115 to at least 125 feet bsg) The following is a brief summary of fourth quarter site assessment activities performed at the site • 25 November 2003 - Depth to water measurements collected at wells MW-1 through MW-19, ground water monitoring performed at wells MW-14 (A-D), MW-16 (A-E), MW-17 (A-C), MW-18 (A-E) and MW-19 (A-C), 26 November 2003 - Ground water monitoring performed at wells MW-4 through MW-12, ' • 28 November 2003 - Ground water monitoring performed at wells MW-1 through MW-3, MW-13 (A-D) and MW-15 (A-D) ' 2.0. PROCEDURES On 25 November 2003,a ground water monitoring event was performed at the site on ground water monitoring wells MW-1 through MW-19, construction details for each monitoring well are summarized in Table 1 Ground water monitoring procedures for the site were outlined in the AGE- I Advanced GeoEnvironmental,Inc