A community’s groundwater has been contaminated by perchloroethylene after years of operation of a dry-cleaning business. Groundwater supplies a spring that feeds a pond and stream and is also the source for a well. A local family relies on the well for their drinking water and regularly eats fish caught in the stream and pond. The concentration of perchloroethylene in the groundwater is found to be 80 mg/L, and the chronic oral RfD is 0.006 mg/kg/day.

a.) Assuming all exposure to perchloroethylene comes from consumption of fish and water, and that children and adults eat the same amount of fish on average per day, calculate the Estimated Exposure Dose (EED) for an adult and a child.

b.) What are the adult and child hazard ratios (HR) for this scenario? Interpret the results.

The average body weight of an adult is 70kg, the average body weight of a child is 10kg, and the amount of fish consumed is 6.5g/day.

What are the steps for applying the Ishikawa (fishbone) method?

why baseflow is necessary to be seperated from the hydro graph ? explain the different methods to seperate it

HOW DO YOU DETERMINE IF A SECTION IS COMPACT OR NON COMPACT ACCORDING TO SLENDERNESS LIMITS

What are the situations where time is called to be ‘at large’? In reference to construction contracts.

Describe briefly a conceptual model of the hydrological cycle. Include in your discussion reasons for conceptualisation of the hydrological cycle in the manner required for development of your model. (typing answer please)

How would you go about testing rainfall records to access their reliability? you can assume that other rainfall records are available both in the same region and within close regions

Produce a fully researched and referenced report (indicative word range 2,250–2,500 words) for a client that explains a particular system, type or design of an innovative modern method of construction suitable for a new primary school.
Your report should:
• include a critical appraisal that evaluates the relative merits of this method of construction over that of a more traditional type of construction;
• address various environmental and sustainability issues.

Please state any assumptions you make in the report. Assumptions can be made as to any specific type of facility, arrangements, layout or size. Please ensure that you write in your own words and that all sources are fully referenced.
Report guidance
The report could look at an offsite system of prefabricated schools.

describe briefly a conceptual model of the hydrological cycle includes in your discussion reasons for conceptualisation of the hydrological cycle in the manner required for development of your model

1) Moisture diffusion is when moisture-laden air infiltrates between different building materials. True or false?

2) Tyvek (or any house wrap) is generally considered to be a:

3) Moisture can enter a building through which of the following?

4) A "smart" vapor retarder (barrier) changes permeability with humidity. True or false?

5) In heated buildings, the vapor flow is generally

1. How does the organization encourage informed, Purposeful and active citizenship?

2. What can students do to be active within the chosen organization?

3. What has this assignment taught you about the importance about the organization's work?

Problem 2 The daily traffic has 1080 20-kip single axles, 400 24-kip single axles, and 680 40-kip tandem axles. Determine the Daily W18 and the 20-yr W18.

Chapter 1 and 2 "The Revolt of Engineers": Layton describes the approaches of the four founder societies of engineering professionals--ASCE, AIME, ASME, and AIEE. In 3-4 sentences, state which of these organizations would be most appealing to you to join based on its membership criteria, stances on professional behavior, and relationship to business, and why. In 1-2 sentences, state which would be least appealing and why?

When a material is left with a decreasing temperature without external force, does it feel tensile or compressive stress?