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					Wastewater Sampling Protocol

Florida Keys OWNRS Study

FLORIDA KEYS ONSITE WASTEWATER Sampling Procedures Evaluation

SAMPLING PROTOCOL
Draft 05/14/2008 E. Roeder

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Wastewater Sampling Protocol

Florida Keys OWNRS Study

Wastewater Sampling Protocol
Florida Keys Onsite Wastewater Sampling Procedures Evaluation

1. INTRODUCTION AND SCOPE
This sampling protocol has been developed from the Florida Department of Environmental Protection’s Standard Operating Procedure for Wastewater Sampling (DEP-SOP-001/01), manufacturer’s owner’s manuals, and various other publications listed in the reference section. The Monroe County Health Department developed these procedures in collaboration with the Florida Department of Health, Bureau of Onsite Sewage Programs. This protocol will be used during sampling and field evaluations of interim, Keys standard and other performance-based treatment systems during county health department inspections. The objectives of this protocol are: • Standardize field inspection procedures • Compare different sampling procedures • Further evaluate differences between time-composite sampling and grab sampling • Evaluate agreement between field methods and laboratory analytical methods

2. ORGANIZATIONAL OVERVIEW
All persons conducting field investigations shall be knowledgeable of the protocols contained in this document, and shall receive field training prior to the commencement of the sampling and evaluation regime. An upper keys sample team and a lower keys sample team shall be assembled. Each team is responsible for chain of custody requirements, laboratory submissions, data collection, and data entry. Analysis of the data will be performed by the Bureau of Onsite Sewage Programs at the conclusion of the assessment project. Each treatment unit shall be evaluated for the unique design parameters that will affect sample points. Sample points shall be identified prior to commencement of the sampling regime. Influent samples from the settling tank prior to treatment shall be preferred. Influent sampling locations in the treatment tank can be used according to the specific manufacturer’s recommendation. Influent sampling ports will be installed if there is no other viable alternative. Take precautions when taking samples from inside a treatment unit so as not to disturb equipment or the treatment process. Chain of custody forms (see sample in Appendix) will be used by all samplers. At the end of each system’s 24 hour sampling cycle, the completed forms will be faxed to a central location. (Tavernier Environmental Health). Data can then be reviewed and entered into a central database.

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Wastewater Sampling Protocol

Florida Keys OWNRS Study

3. EXPERIMENTAL DESIGN
3.1. Further evaluation of grab vs. time-composite sampling. To expand the treatment technologies and number of systems evaluated, approximately 10 new volunteer sites will be recruited from interim systems. To be included in the study, systems will have to fulfill the following criteria: residential system, current maintenance contract, permanent residency in the Keys (homestead exemption). Interim systems will be randomly selected from the total population of interim systems in the Florida Keys that were not previously contacted. These sites will be evaluated by time-composite and multiple grab samples according to the previous protocol. 3.2. Comparison of field and laboratory methods of effluent quality assessment. To evaluate the agreement between field and lab assessments of effluent quality, grab samples of effluent will be characterized to compare: 3.2.1. color and odor vs cBOD5 and TSS 3.2.2. residual chlorine, color and odor vs fecal coliform 3.2.3. Hach-kit and test strip results vs laboratory analysis for nitrate, ammonia, and phosphorus 3.2.4. Taylor kit vs laboratory analysis for alkalinity and pH 3.3. Evaluation of field inspection protocols. To evaluate differences between sampling in the presence and absence of maintenance entities and the incremental time needed for different intensities of inspections, a sample of systems will be visited by the CHD in conjunction with a maintenance visit by the maintenance entity. The CHD will initially or on the day prior inspect and sample the system according to the CHD-inspection protocol. The maintenance entity will then indicate where the CHD should take any additional samples according to manufacturer’s instruction and perform their maintenance visit. 3.4. Evaluation of effluent quality during CHD-inspections. To assess the effluent quality of the overall population of systems, the CHD will sample systems on the occasion of the annual inspection visit.

4. SAMPLING EQUIPMENT
Three auto samplers manufactured by Global Water Instrumentation Inc. shall be employed. These are suction-lift samplers using a peristaltic pump to collect wastewater. The maximum rated lift is 22 feet in the neoprene ¼ inch inside diameter hose. This meets FDEP requirements. Two of the auto-samplers are model WS300 samplers. These units will be used for influent and effluent time-composite samples. A 150 ml sample will be collected each hour for 24 hours to form a 3600 ml composite. One unit, model WS700, will be used to collect discrete 500 ml grab samples at designated times. The auto-samplers shall be calibrated, maintained and cleaned according to the manufacturer’s specifications. (See user manuals in Appendix) As alternatives for grab samples, sampling by hand pump and container from free-fall locations (where accessible during joint sampling with the maintenance entity) will be evaluated. While composite samples are being gathered, the collected sample shall be maintained at 4°C. To accomplish this, bags of ice shall be used in the cooler compartment, around the sample container.

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