WORK PLANS_FILE 1 - Laserfiche WebLink

Home Browse Search

ATC Associates Inc. I 1 l7 Lone Palm V AvenueSuite Modesto,California 953511 209-579-2221 Fax`.209-579-2225 l Soil and Groundwater Sample Analysis I Soil and groundwater samples collected during drilling activities will be analyzed for CDCs which include TPHg or Gasoline Range Organics (GROS) by EPA Method 8015B and BTEX, MTBE, ETBE,DIPE,TBA, TAME, 1,2-DCA,and EDB by EPA Method 8260B. Soil Vapor Extraction Test Petroleum impacted soil can often be remediated using vapor extraction techniques. Vapor extraction of petroleum hydrocarbon impacted soil utilizes the fact that some petroleum hydrocarbon constituents can be volatilized or changed from the solid or liquid phase to the vapor phase at normal temperatures. The movement of air through the soil and groundwater, which is accomplished by extracting air from the subsurface through vapor extraction wells, facilitates the volatilization of contaminants to the vapor phase. These contaminants are then removed from the soil by extracting the vapor with the petroleum hydrocarbons from the subsurface through vapor extraction wells and subsequently treating the vapor. ATC will perform a vapor extraction test (VET) to collect site-specific data relative to vapor extraction from the subsurface and evaluate the feasibility of vapor extraction as a remedial alternative. The results of the pilot test will help to detennine the effective radius of influence; to select the optimum ofl-gas abatement process; and to develop engineering design criteria for the construction of a remediation system at the subject site. Soil Vapor Extraction Pilot Testing Equipment The equipment that will be used during the VET consists of a 5 horsepower blower, three serially- connected, vapor phase granular activated carbon (GAC) vessels, instrumentation for measuring air flow, air velocity, air pressure and air temperature, PVC piping, fittings, wellhead connections, a portable organic vapor analyzer, and air sampling apparatus. ATC will utilize the three new vapor wells and nearby groundwater monitoring wells to conduct the pilot testing. The pilot test will consist of two short term VETS on the first day and one long term VET on the second day. Short Term Vapor Extraction Tests Two consecutive short term VETS will be performed by applying a vacuum on selected vapor wells utilizing the blower for approximately two to four hours or until subsurface conditions stabilize. The remaining vapor wells,and nearby groundwater wells will be used as observation wells. During the test,field personnel will measure flow rates,applied vacuum on the test well, induced vacuum in observation wells, pressure, and temperature. The extraction flow rate will be adjusted until the maximum flow rate and applied vacuum can be determined. Jamar service Station 5