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' Preliminary Site Assessment Report FIRE STATION #2 - South UST Area ' 110 West Sonora Street, Stockton, California ' 1.0. INTRODUCTION AND SCOPE OF WORK ' At the request of the City of Stockton,Advanced GeoEnvironmental, Inc (AGE)has prepared this report documenting preliminary site assessment activities at the southern underground storage tank (UST) area at 110 West Sonora Street, Stockton, California (the site), five soil borings were ' advanced, and soil and grab ground water samples were collected and analyzed The location of the site and.Its surroundings are illustrated in Figure I Structures and monitoring and remediation well locations associated with the site are depicted in Figure 2 ' The work was preformed in accordance with procedures outlined in theAGE-prepared Preliminary Site Assessment Work Plan -South USTArea,dated 20 June 2002, and approved by the San Joaquin ICounty Environmental Health Department (EHD) by letter, dated 21 June 2002 2.0. PROCEDURES On 08 and 15 July 2002, a total of five soil borings were advanced at the site Field procedures for lie the advancement and sampling of soil borings are described below The field work was performed in accordance with Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines for the investigation of underground storage tank (UST) sites I21 GEOPROBE DRILLING AND SAMPLING The soil borings were advanced using a Geoprobe 5400, equipped with 2 25-inch diameter hollow- stem rods and associated sampling tools The rig and operator were supplied by EnviroProbe Soil pilot borings Pl, P2, P3, P4 and P5 were advanced to depths of 50 feet below surface grade (bsg) for ground water sample collection and soil sample collection and soil pilot boring P2 was advanced to a depth of 30 feet bsg Soil samples were collected from 5 feet to 30 feet bsg in soil probe borings P 1, P2, P5 and from 5 feet to 50 feet bsg in boring P3, while no soil samples were collection from soil probe boring P4 All sampling equipment was washed in an Alconox solution and rinsed twice with water prior to each sampling run Soil samples were collected from the probe boring using a Geoprobe soil sampling device loaded with four 6-inch by 1125-inch brass sleeves The samples were collected at five-foot intervals, starting at 5 feet bsg in sampled borings Both ends of the soil sleeve of each sample collected for laboratory analysis were covered with Teflon sheets,capped and sealed with tape The sample sleeve was labeled with soil probe boring location, depth, time, date and sampler's initials and placed in a chilled container under ice Advanced GeoEnvuonmental,Inc