Sampling Sites Wastewater VOC survey

7/31/02 Wednesday and 8/1/02 Thursday

Shell Oil, Martinez, California, (BAAQMD Plant #A0011)

Intention of the study is to determine VOC emissions from wastewater, ambient air locations, and VOC emissions from ancillary wastewater system process units.

Water Sample procedures: Two methods will be used to collect water samples. A coliwasa is the preferred sampling method to be used for TPH gasoline analysis. However, if the depth of the wastewater is less than one foot or a manhole/junction box opening is not available then a 1-liter grab sample method shall be used to retrieve a representative sample.

1. Coliwasa sample (Maximum sample size = 250 ml glass open mouth jar) (The term stands for composite liquid waste sampler). A coliwasa is designed to take a composite (from top to bottom) sample. The device used in this study is manufactured in high-density polyethylene with and Teflon coated topper. (Reference: ASTM method D5495-94 (2001) Standard Practice for Sampling with a Composite Liquid Waste Sampler). Samples will be transferred to 40-ml VOA for TPH gasoline analysis.
2. Grab sample (Sample size = 1 liter container, with an aliquot transferred to 40-ml VOA if coliwasa not used.) The grab sample is designed to collect a liquid sample from a process pipe or from a fluid surface that can be accessed by the suitable device, i.e. manhole. The device used in this study uses a caged, i.e., protected, 1-liter glass sample container. (See ASTM method D6759-02 Standard Practice for Sampling Liquids Using grab and Discrete Depth samplers).
3. Air Sample = air ambient air grab sample into a 6 liter Stainless steel Summa® passivated canisters. Canisters begin evacuated and will be allowed to return to ambient in wastewater areas and sewer openings.

Mechanics of Sampling: Sewer manholes and junction boxes will be sampled via coliwasa or grab container. Process line sampling will be use standard Shell sampling procedures.

Sample prep and organizational meeting:

Sampling Procedure for coliwasa and grab sampling locations

1. Confirm if sampling area is a confined space entry using LEL meter and OVA meter. If lowering sampling device is considered a confined space activity then use Shell confined space entry procedures. Monitor for explosive gases using LEL throughout sampling activity.
2. Take a measurement of organic gases at 2 inches below manhole lip using OVA. and record measurement.
3. Take dimensions of sampling area and piping. Note if sewer is open or p-trap design.
4. Measure depth of flow
5. Lower 3-inch pipe containing coliwasa (or grab sampler) into sampling area if flow exist. Sample wastewater using coliwasa or grab device.
6. Retrieve sampler. Place sample in secure location
7. Repeat sample collection as necessary. Secure a separate sample for sample temperature measurement and observation of sample visual parameters using a graduated cylinder. Measure and record sample temperature using thermometer
8. Store sample in wet ice.
9. Retrieve 3 inch plastic pipe.
10. Place used coliwasa samplers in plastic bag.
11. Place used 3 inch PVC pipe place in plastic bag.
12. If no flow, collect air sample using Summa canister using sampling procedure detailed in ARB QA manual Volume II Appendix Q.
13. Close sampling area

Sampling Locations

(From Shell wastewater treatment schematic diagram DCN=665641)

Notes:

1. Spiking - lab will spike a 1 out of ever ten water samples.
2. Preservation - Samples will be taken with sample containers supplied by McCampbell Analytical Inc. with preservative. Preserve wastewater samples will be stored in wet ice and transported to lab on same day samples were taken.
3. Trip/equipment blank prepared using laboratory deionized / low organic water using unused coliwasa.
4. One duplicate will use a coliwasa (using new coliwasa) a new section of 3-inch PVC pipe.
5. Sample Labeling Code example: S-1 for Shell sample point #1.
6. Field staff will measure the relative volumes of aqueous phase and oil phase using a graduated cylinder. Staff will record phases present in sample (e.g., solids, emulsion, water layer, and oily layer).
7. Procedure for analyzing the wastewater samples will be EPA method 8015/8020. The wastewater samples are one phase (water). Each wastewater sample will result in two analyses (TPH gasoline & TPH diesel). McCampbell Analytical 110, Second Avenue South, D#7, Pacheco, CA 94553.