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Quarterly Report - Second Quarter 2004 PACIFIC CAR WASH I4405 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 the performance of 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 on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 ' This report is prepared in accordance with guidelines issued by the California Regional Water Quality Control Board - Central Valley Region (CRWQCB) for the investigation of underground ' storage tank(UST)sites A summary of previous 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 bonng/well drilling enabled AGE to define five informal hydrogeologic 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 to 45 feet bsg),First Confining Unit(45 to 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 second quarter site assessment activities performed at the site ' • 01 June 2004 - Depth to water measurements collected at wells MW-1 through MW-19, ground water monitoring performed at wells MW-9,MW-10(A,B),MW-12,MW-15(A-D), ' MW-16 (A-E), MW-17 (A-C), MW-18 (A-E), and MW-19 (A-C), • 02 June 2004-Ground water monitoring performed at wells MW-1 through MW-8,MW-11, ' MW-13 (A-D), and MW-14 (A-D) 2.0. PROCEDURES On 01 and 02 June 2004,a giound vv ater monitoring ei ent v as performed at the site ori ground water monitoring wells MW-1 through MW-19, construction details for each monitoring well are summarized in Table 1 Advanced CeoEnvironmental,Inc