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PES Environmental , Inc . evaluation , a second 14iter SUMMA canister will be placed within the shroud and used to collect a shroud air sample concurrent with each sub - slab vapor sample . The shroud air sample will be analyzed for the tracer gas only to quantitatively assess representative leak check compound concentrations in the shroud . A 1 -liter vapor sample SUMMA canister that is batch-certified clean by a California-certified analytical laboratory will be utilized to collect the sub - slab vapor sample . The shroud and sub - slab vapor sample canister will be filled until the vacuum gauge reads approximately 5 inches of mercury (Hg) or less . Field QA / QC sampling for the sub - slab vapor sampling will consist of one true - duplicate sample ( same sample inlet , equally divided into two separate sample canisters ) . The duplicate sample will be collected concurrent with the collection of the primary sample . After sampling , the SUMMA canisters will be transported to the analytical laboratory under chain-of- custody protocol . The sub - slab vapor sample and duplicate will be analyzed by K Prime Inc . (K Prime) , of Santa Rosa , California for Total Volatile Hydrocarbons ( C2 - C10) by U . S . Environmental Protection Agency (U . S . EPA) Test Method TO - 3 ; and Benzene , Ethylene , Toluene and Xylene (BTEX) compounds by U . S . EPA Test Method TO45 . In addition , the shroud sample will be analyzed for the propellant tracer 1 , 1 -Difluoroethane ( 1 , 1 -DFA) by U . S . EPA Test Method TO - 3 . 2 . 3 . 3 Supplemental OIHPT Investigation 2 . 3 . 3 . 1 Selection of Supplemental OIHPT Locations Based on the results of the November 2020 LNAPL investigation' , approximately 11 locations have been identified , shown on Plate 1 , for additional LNAPL delineation activities . The proposed locations consist of the following : ( 1 ) three locations west of OIP44 and OIP -7 along the slough- side of the levee to establish boundary conditions and confirm the absence of LNAPL ; (2) near MWP - 4 where elevated concentrations of petroleum hydrocarbons and BTEX compounds have been detected during previous groundwater monitoring activities , ( 3 ) within and east of the former pipeline leak excavation to confirm the absence of LNAPL and set boundary conditions ; (4) areas east of OIP4 (where LANPL was previously observed) and Well No . 2 on the former boat repair facility to evaluate for the presence of LNAPL ; and (6 ) south of the boat repair facility on the slough- side of the levee to confirm the absence of LNAPL and establish boundary conditions . 2 . 3 . 3 . 2 OIHPT Data Collection Procedures An Optical Image Hydraulic Profile Tool ( OIHPT) developed by Cascade Remediation Services ( Cascade ) will be utilized for LNAPL delineation activities . Cascade possesses a valid C - 57 water well contractor ' s license issued by the State of California in accordance with California Department of Water Resource Water Well Standards (Bulletin 74 - 90) . 9 PES , 2020 . LNAPL Corrective Action Plan, Paradise Point Marina, 8095 Rio Blanco Road, Stockton, California . December 16 . 148400101W006 . docx 5 D R A F T