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Cleanup in Vulnerable Communities'Initiative Discovery Project Reference:Favorite Cleaners and Enforcement Discovery Investigation Work Plan Project Number:60688620 air sampling event,the samples should be collected during normal operation of the building's heating and air conditioning system with door and windows closed as much as possible. • Extra canisters, pressure gauges, and flow regulators should be taken into the field in case the integrity of some of the canisters are compromised, or if some flow regulators and pressure gauges malfunction. Each sampling canister should have a dedicated vacuum gauge. Flow regulators should be configured to produce a constant sampling rate. Sampling canisters, along with all flow regulators and pressure gauges, should be 6-liter, individually certified clean, passivated canisters and gauges and analyzed using USEPA Method TO-15 SIM, reported down to the laboratory's method detection limit(MDL). When sampling indoor air, ambient(outdoor)air should be sampled concurrently. PID readings will be collected from the outdoor ambient air sampling locations. The following should be considered when collecting outdoor ambient air samples: • When deploying samplers outdoors to quantify background conditions,the samplers should be protected against rainfall and direct sunlight, both of which could bias the sampling results. • Sampling devices should be located approximately 6 feet off of the ground. • Outdoor ambient air sampling should be conducted concurrently with the indoor air sampling. • Collection of outdoor ambient air samples should be located away from gasoline stations, automobiles, gasoline-powered engines,fuel and oil storage tanks, chemical storage areas, and dry-cleaning equipment. • Sampling devices should be placed at least 10 feet beyond a tree's drip line. • Outdoor ambient air samples collected on the predominately upwind side of a building should be placed at a distance equal to twice the height of the building. • Three outdoor ambient air samples(plus one duplicate), at a minimum, should be collected during each indoor air sampling event.The outdoor ambient air samplers should be placed around the building with respect to up, down, and cross the prevailing wind direction.This placement will account for changes in the wind direction throughout the day. • Outdoor ambient air samples will be collected in individually certified, 6-liter, stainless-steel, Summa®canisters. • Outdoor ambient air samples will be analyzed using USEPA Method TO-15 SIM, reported down to the laboratory's MDL. Applying these considerations,the following steps will be performed: 1. Prior to sampling, each canister will have its vacuum checked with a dedicated gauge, with the expected vacuum ranging from-28 to-29 inches of mercury(" Hg). If any canister differs from the others by 3" Hg or more,the canister will not be used, as the integrity of the canister may have been compromised. 2. Once the canisters are in place,the valve of the outdoor ambient air canister will be opened, and the start time and vacuum gauge reading will be recorded.This process is repeated for each other canister as quickly as possible. 3. Each outdoor ambient air canister will be equipped with an 8-hour flow regulator.After 8 hours, and when the pressure is at less than 8" Hg,the final time and vacuum will be recorded, and the valves will be closed at approximately the same time. 3.2.5.6 Field Quality Control Samples The field QC samples planned for this Discovery Investigation are equipment rinsate blanks and duplicates.These two(2)types of samples are discussed below. Field Equipment Rinsate Blanks(for groundwater sampling) Afield equipment rinsate blank is a sample that is prepared in the field by pouring de-ionized, distilled (for inorganics) or HPLC grade(for organics)water through and over cleaned sampling equipment. The water is then collected and analyzed as a sample.The field equipment rinsate blank gives an indication of contamination from field procedures Prepared for: California Department of Toxic Substances Control AECOM 18