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Quik Stop Station No 039 February 28,2000 Stockton California Subsurface Site Assessment HORIZON ENVIRONMENTAL INC. FIELD METHODS AND PROCEDURES The following section describes field procedures that will be completed by Horizon Environmental Inc (Horizon) personnel in performance of the tasks involved with this project 1.0 HEALTH AND SAFETY PLAN Field work performed by Horizon and subcontractors at the site will be conducted according to guidelines established in a Site Health and Safety Plan (SHSP) The SHSP is a document that describes the hazards that may be encountered in the field and specifies protective equipment, work procedures, and emergency information A copy of the SHSP will be at the site and available for reference by appropriate parties during work at the site 20 LOCATING UNDERGROUND UTILITIES Prior to commencement of work on site, the location of underground utilities will be researched with the assistance of Underground Service Alert (USA) USA will contact the owners of the various utilities in the vicinity of the site to have the utility owners mark the locations of their underground utilities Work associated with the boring and monitoring well installation will be preceded by manual hand augering to a minimum depth of 4 feet below grade to avoid contact with underground utilities 30 SOIL BORING AND SOIL SAMPLING PROTOCOL Soil borings and soil sampling will be performed under the supervision of a Horizon geologist The soil borings will be advanced using a truck-mounted hollow-stem auger drilling rig To reduce the chances of cross-contamination between boreholes, downhole drilling equipment and sampling equipment will be steam-cleaned between borings To reduce cross-contamination between samples, the split-barrel sampler will be washed in a soap solution and double-rinsed between each sampling event Sod sampling will be conducted in accordance with ASTM 1586-84 Using this procedure, a split-barrel sampler (California-type sampler) lined with brass sample sleeves is driven into the soil at approximately 5-foot intervals by a 140 pound weight falling 30 inches The number of blow counts required to advance the sample 18 inches will be recorded at each sample interval Upon recovery, a portion of the soil sample will be placed in a plastic bag and sealed for later screening with an hNu type organic vapor meter (OVM) Another portion of the soil sample will be used for classification and description Generally, the bottom sample will be sealed in the brass sleeve and stored at approximately 4°C for transport to the laboratory After the portion of the soil sample is placed in the plastic bag, it will be allowed to warm, inducing volatilization of petroleum hydrocarbon vapors The headspace vapors will be screened with the OVM The highest observed reading will be recorded on the boring logs 7039-12 rpt B- 1 HORIZON ENVIRONMENTAL INC