Laserfiche WebLink
s <br /> 3.0 SCOPE OF WORK <br /> Air sparging with soil vapor extraction (AS/SVE) was selected as the most cost effective remedial <br /> alternative to mitigate subsurface impacts to below risk-based levels. Air sparging will remediate <br /> groundwater and saturated soils by stripping organics, and introducing oxygen for biodegradation. <br /> A total of four(4) air sparge wells are proposed to address dissolved petroleum hydrocarbons. The <br /> following scope of work is proposed to complete the air sparge well installations. <br /> 3.1 Health and Safety Plan <br /> Prior to conducting any site activities, SECOR will implement a site-specific health and safety plan <br /> for drilling activities as required by 29 CFR 1910.120. The health and safety plan details field <br /> procedures regarding various potential health and safety hazards that may be encountered during site <br /> activities. <br /> 3.2 Permitting <br /> SECOR will obtain the necessary permits required by the San Joaquin County Environmental Health <br /> Division for the air sparge well installations. <br /> 3.3 Utility Clearance <br /> Prior to any field work, SECOR will conduct a utility clearance of the drilling area to ensure that <br /> subsurface utilities are not intercepted during drilling activities. Additionally, Underground Service <br /> Alert (USA) will be notified by SECOR at least 48 hours prior to drilling. <br /> 3.4 Soil Sampling <br /> Four soil borings will be advanced at the site at the locations depicted on Figure 2. The soil borings <br /> will be drilled with a truck-mounted drill rig utilizing 8-inch outside diameter hollow-stem augers. <br /> Three of the borings will be advanced to a depth of approximately 90 feet below ground surface. The <br /> fourth soil boring in the vicinity of MW-1 will be advanced to 100 feet bgs to address deeper <br /> hydrocarbon inpacts in that area. Samples will be collected every S feet or at obvious changes in <br /> lithology using a split spoon sampler. Soil samples and drill cuttings will be logged by a SECOR <br /> geologist using the Unified Soil Classification System. In addition, all soil samples and drill cuttings <br /> will be screened utilizing a photoionization detector(PID) or equivalent equipment. These readings <br /> and any subjective evidence of petroleum hydrocarbons will be recorded on the boring logs. Because <br /> previous investigations at the Site have adequately characterized the extent of hydrocarbon impacts, <br /> none of the collected soil samples will be submitted for laboratory analysis. <br /> Lockspar.wp I SECOR <br /> Job No.7"5-001-02 June 7,1999 <br /> 3 <br />