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30 June 2017 30 June 2017 AGE Project No.07-1529 AGE Project No.07-1529 Page 3 of 6 Page 4 of 6 • Volatile organic compounds including benzene, toluene, ethylbenzene and total For installation of soil-vapor wells,'/.-inch diameter,2-inch long polyethylene soil vapor xylenes(BTEX),and naphthalene in accordance with EPA Method 8260B;and implants and nine feet of%-inch Teflon®tubing will be lowered to the base of the borings; three feet of tubing will remain outside the boreholes for vapor sample collection. • Fuel additives including methyl tertiary butyl ether(MTBE),tertiary-butyl alcohol di-isopropyl ether (DIPE eta I tertiary-butyl ether ETBE tertia However,before installing the vapor implant and tubing,approximately six inches of#2/12 (TBA), ), y ( ), tertiary-amyl sand will be placed at the bottom of the boreholes for the vapor implants to be placed on. methyl ether(TAME)ethylene dibromide(EDB)and 1,2-dichloroethane(1,2-DCA) Once the six inches of sand,tubing and vapor implants are in place,the filter pack of in accordance with EPA Method 8260B. #2/12 sand will continue to be added from the bottom of the boreholes to approximately 4.5 feet bsg or approximately nine inches above the top of the vapor implants.Following Soil-vapor samples will be collected between 5 and 6 feet bsg and will be analyzed by a placement of the filter pack,approximately 12 inches of dry granulated bentonite will be CDPH-certified laboratory for the following constituents: placed atop the filter packs.The remaining annular space will be filled to near ground surface with a cement grout. The grout mixture will consist of Type 1/II Portland neat • Total petroleum hydrocarbons quantified as gasoline(TPH-g)in accordance with cement with approximately 3-5%bentonite content.A flush mounted well box will then be EPA Method TO-15; installed over the wells.Approximately,three feet of extra tubing will be run above ground for soil-vapor sample collection. A well construction diagram illustrating the proposed • BTEX,and naphthalene in accordance with EPA Method TO-15; design is included as Figure 3. • Fuel additives MTBE,TBA,DIPE,ETBE,TAME EDB and 1,2-DCA in accordance Once soil-vapor wells are installed, a minimum of 48 hours equalization time will be with EPA Method TO-15; observed prior to sampling the wells. • Percent oxygen(fixed gas)in accordance with analytical method ASTM D 1946- 90;and 3.2. SOIL SAMPLING • Tracer compound isopropyl alcohol in accordance with EPA Method TO-15. Soil samples will be collected at 5 feet bsg in the soil borings by hand-packing soil out of Laboratory reports for soil-vapor analyses (lowest possible detection limits), testing the hand auger bucket into steel sample sleeves.Following sample collection,the sample methods, laboratory quality assurance/quality control (QA/QC) reports, and sample sleeves will be covered with Teflon sheets,capped and sealed with tape. chain-of-custody documentation will be presented in a report with the findings and d Appropriately sealed and labeled samples will be placed in a chilled container under ice recommendations. Electronic deliverable format(EDF)files the laboratory analytical and transported under chain-of-custody procedure to a CDPH-certified laboratory. results will be submitted to the State of California GeoTracker database. Samples will be analyzed for the constituents listed in Section 2.3. Each sample will be labeled with boring designation, depth, time, date and sampler's initials. Soils 3.0. PROCEDURES encountered in the borings will be visually classified by AGE personnel in accordance with the Unified Soil Classification System(USCS).Additionally,soil samples will be field- All field procedures will be overseen by an AGE representative under the supervision of screened for presence of volatile organic compounds using an organic vapor meter a California Professional Geologist.Procedures for advancing soil borings,installation of (OVM), equipped with photo-ionization detector(PID; Mini Rae 3000)pre-calibrated to soil-vapor wells, collection and analysis of soil and soil-vapor samples, equipment isobutylene. decontamination and sample handling are presented below. 3.3. SOIL-VAPOR SAMPLING 3.1. SOIL-VAPOR WELL INSTALLATION Soil-vapor samples will be collected from the vapor wells using Summa canisters.For this AGE proposes to advance a total of two(2)pilot soil borings to 6.0 feet bsg for installation method, one six-liter Summa canister will be utilized for purging and each soil-vapor of depth discrete soil-vapor wells to evaluate the potential threat of vapor intrusion to the sample will be collected in a one-liter Summa canister.The sampling and purge canisters site building.Proposed soil borings will be advanced using a 3-inch diameter hand auger. will be connected together with a dedicated and serialized sampling inlet manifold.The sampling inlet manifold will consist of a vapor-tight valve;a particulate filter;a calibrated A&-a,d GmEn Imn txl Inc. Ad.,,-d C-Envlmntn W I...