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' ADDITIONAL SITE ASSESSMENT REPORT <br /> PREM DOR <br />' 433 West Scotts Avenue, Stockton, California <br /> I1.0. INTRODUCTION <br /> At the request of Dr Sonya F Olbrantz of Masonite International/Prem Dor, Advanced <br />' GeoEnvironmental, Inc (AGE) has prepared this Additional Site Assessment Report for <br /> environmental activities conducted at 433 Scotts Avenue, Stockton,California(the site) The scope <br /> of work included advancement of two soil probe borings and one cone penetrometer testing (CPT) <br />' boring,installation of two additional on-site ground water monitoring wells,submission of analytical <br /> data to the State Water Resources Control Board's GeoTracker information management system,and <br /> preparation of this report The site and surrounding area are illustrated on Figure I Structures, soil <br />' borings, and monitoring well locations are illustrated on Figure 2 Additional site background <br /> information and a site conceptual model are provided in Appendix A <br />' Field work was conducted in accordance with guidelines issued by the Central Valley Regional <br /> Water Quality Control Board(CVRWQCB)for the investigation of underground storage tank(UST) <br />' sites Soil boring, cone penetrometer testing, and ground water monitoring well installation <br /> procedures are outlined in the AGE-prepared Additional Site Assessment Work Plan and Site <br /> Conceptual Model, dated 15 February 2005, and Work Plan Addendum, dated 14 April 2005 <br /> 2.0. PROCEDURES <br /> IOn 19 and 25 July 2005, two soil probe borings (B5 and B6) were advanced off-site On 20 July <br /> 2005,one soil boring(CPT-1)was advanced on-site utilizing CPT technology On 21 July 2005,two <br /> additional ground water monitoring wells (MW-4 and MW-5) were installed at the site, the <br /> monitoring wells were developed on 29 July 2005 and surveyed on 21 September 2005 <br /> i21 GEOPROBE LITHOLOGIC INVESTIGATION <br /> On 19 and 25 July 2005, two soil probe borings (B5 and B6)were advanced to the north and south <br /> of the site, respectively <br /> 2 1 1 Advancement of Soil Borings <br /> Utilizing a van-mounted Geoprobe 5400 direct-push probing unit,borings B5 and B6 were advanced <br /> at the following locations (Figure 2) <br /> • Boring B5 was advanced to a total depth of 35 feet below surface grade(bsg),approximately <br /> 54 feet southeast of monitoring well MW-5, and <br /> IAdvanced GeoEnvironmental,Inc <br /> I <br />