몬테리어 반도의 물 관리 지구(MPWMD)는 Pure Water Monterey Groundwater Replenishment(GWR) 프로젝트와 관련된 3개의 핵심 요인의 비용 편익 분석을 위해 2014년 5월 1일까지 권한이 있는 조직에 권한 성명서를 요청하고 있다.

종합적인 목적은 GWR프로젝트와 6.4에서9.6으로 크기가 증가한 California American Water desalination 프로젝트의 비용 편익 비교이다. GWR의 주요 목적은 다양한 자원으로부터 축적되고 재사용된 고품질의 물을 매년 3천500백 케이커 풋을 생산해서 해변유역의 대수층 보충이다.

The Monterey Peninsula Water Management District (MPWMD) is soliciting statements of qualifications by 1 May 2014 from qualified organizations to perform triple bottom line cost-benefit analysis related to the proposed Pure Water Monterey Groundwater Replenishment (GWR) Project.

The overall objective is to compare the cost-benefit of the GWR project against increasing the size of the California American Water desalination project from 6.4 to 9.6 MGD (24,000 to 36,000 m³/d). The primary objective of the GWR Project is to replenish the Seaside Basin aquifer by producing 3,500 acre-feet per year (4.3 million m³/y) of high quality reused and collected water from various sources.

The triple bottom line requirement means that the water supply solution needs to be evaluated in terms of benefits that extend beyond simply cost to the ratepayer, to include other factors that affect environmental and social policy goals, regionally and statewide.

"The concept of 'social ROI' (return on investment) has been introduced in the past decade and is becoming a more important decision-making criterion," says the MPWMD in its RfQ.

Significant positive benefits that could influence the decision of the California Public Utilities Commission towards the smaller desalination plant + the GWR, at a higher cost, could include, says the MPWMD:

(i) A material schedule advantage in that the GWR Project is anticipated to be operable sooner than the desalination plant

(ii) Water supply resilience and reliability (benefit of the portfolio approach)

(iii) Other positive externalities of the GWR Project, including, but not limited to, reduced atmospheric carbon emissions, reduced brine discharge, and the implementation and encouragement of State policies regarding water recycling through early adoption of a water reuse project.

[출처 = Desalination & Water Reuse/ 2014년 4월 21일]