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ti <br /> L <br /> 1r <br /> ' Quarterly Report - Fourth Quarter 2004 ` <br /> FERNANDO'S PLACE _ <br />' 1201 South Center Street, Stockton, California <br /> 1. INTRODUCTION a r <br /> At the request of Mr Roger Huckins,Advanced GeoEnvironmental, Inc (AGE) has prepared this <br />' quarterly report for the property located at 1201 South Center Street,Stockton,California(site) The <br /> scope of work included the performance of a quarterly ground water monitoring event, submission <br />' of monitoring and analytical data to the State Water Resources Control'Board's GeoTracker <br /> information management system, and preparation of this report The location of the site and the <br /> surrounding area is illustrated on Figure 1, structures, former underground storage tank (UST) <br /> locations,and soil boring and monitoring well locations are illustrated on Figure 2 Site background <br />' information is provided in Appendix A <br />' Based on the results of previous investigations, AGE has informally identified five hydrogeologic <br /> units between first encountered ground water and 199 feet below surface grade (bsg) as having <br /> significant intervals of apparently porous,coarser-grained soil separated by intervals of finer-grained, ' <br /> less permeable soil (Appendix A) Hydrogeologic Unit 1 (HU-1) was identified at depths between <br /> 25 feet(first encountered ground water)and 90 feet bsg,it was subdivided into three sub-units(HU- <br /> 1 Upper Zone,HU-1 Middle Zone, and HU-1 Lower Zone)that may not have significant barriers to <br /> vertical migration of contaminations Hydrogeologic Unit 2(HU-2)was identified at depths between <br /> 112 feet and 125 feet bsg, Hydrogeologic Unit 3 (HU-3)was identified at depths between 140 feet <br /> and 160 feet bsg, Hydrogeologic Unit 4 (HU-4)was identified at depths between 160 feet and 175 <br />' feet bsg, and Hydrogeologic Unit 5 (HU-5) was identified at depths between 190 feet and 199 feet <br /> bsg <br /> 2.0. PROCEDURES <br />' Field work was performed in accordance with guidelines issued by the Central Valley Regional <br /> Water Quality Control Board (CVRWQCB) and the San Joaquin County Environmental Health <br /> Department(EHD)for the investigation of underground storage tank(UST) sites and the sampling <br />' of ground water monitoring wells, respectively <br />' 2 1 WELL MONITORING AND EVACUATION <br /> r <br />' On 01 and 02 December 2004,ground water monitoring and sampling were performed at one single- , <br /> completed monitoring well location (MW-1), two clustered monitoring well locations (MW-2A/B <br /> and MW-3AB),and six multi-chambered monitoring well locations[MW-4(A-E),MW-5(A-E),and <br />' MW-6(A-D)through MW-9(A-D)];a total of 31 well points were monitored and sampled Due to <br /> scheduling conflicts, the ground water monitoring could not be completed concurrently with the <br /> . neighboring Arc Pump and Weld site <br /> Advanced GeoEnvironmental,Inc <br /> s <br />