14
THURSDAY, SEPTEMBER 9, 1993
THE ESTIMATE IS BASED ON A VERY LARGE BODY OF INFORMATION GATHERED IN HONG KONG IN RECENT BATHING SEASONS.
STATISTICAL
THE GRADING OF SOME BEACHES MAY VARY DURING THE SUMMER. THIS REPRESENTS A NATURAL FLUCTUATION IN THE BACTERIOLOGICAL QUALITY OF BATHING WATER IN MOST CASES, AS RAIN AND TIDES BRING MORE OR LESS POLLUTION TO THE BEACHES.
HOWEVER, THE GRADES GIVE A GOOD GENERAL PICTURE OF THE WATER QUALITY AT BATHING BEACHES AT THE TIME OF REPORTING AND FORM THE BEST AVAILABLE FORECAST FOR THE IMMEDIATE FUTURE.
"BEACHES WITH HIGHLY DEVELOPED HINTERLANDS ARE LIKELY TO BE MORE POLLUTED THAN THE GRADES SUGGEST DURING AND AFTER HEAVY RAIN.
"BATHERS SHOULD AVOID SUCH BEACHES FOR TWO OR THREE DAYS AFTER A STORM, LONGER IF THE WEATHER REMAINS OVERCAST OR LESS IF THERE IS STRONG SUNSHINE, THE SPOKESMAN SAID.
+
THE SYSTEM FOR GRADING BEACH WATER QUALITY IS:
THE E.
* GRADE "1" INDICATES THAT THE WATER QUALITY IS GOOD.
COLI COUNT IS NO MORE THAN 24 PER 100 MILLILITRES AT BACH BEACH SO GRADED, AND THE EXPECTED RISK OF MINOR ILLNESS SWIMMERS IS UNDETECTABLE.
* GRADE "2" INDICATES THAT THE WATER QUALITY IS FAIR. THE
COLI COUNT IS NO MORE THAN 180 PER 100 MILLILITRES AT BEACH SO
GRADED, AND THE EXPECTED HEALTH RISK IS THAN 10 CASES OF MINOR ILLNESS PER 1,000 SWIMMERS.
*
TO
E.
EACH
NO MORE
THE E.
EACH MORE
GRADE "3" INDICATES THAT THE WATER QUALITY IS POOR. COLI COUNT IS NO MORE THAN 610 PER 100 MILLILITRES AT BEACH SO GRADED, AND THE EXPECTED HEALTH RISK IS NO THAN 15 CASES OF MINOR ILLNESS PER 1,000 SWIMMERS.
"I
GRADE 4" INDICATES THAT THE WATER QUALITY IS VERY POOR. THE E. COLI COUNT IS MORE THAN 610 PER 100 MILLILITRES AT EACH BEACH SO GRADED, AND THE EXPECTED HEALTH RISK IS MORE THAN 15 CASES OF MINOR ILLNESS PER 1,000 SWIMMERS.
THE DECISION ON WHETHER OR NOT TO CLOSE A BEACH TO SWIMMERS BASED ON A JUDGMENT OF WHAT DEGREE OF POLLUTION IS ACCEPTABLE.
IS
NORMALLY, THE CLOSURE OF A BEACH WOULD ONLY BE CONSIDERED BY THE URBAN COUNCIL OR REGIONAL COUNCIL IF A GRADE "4" OCCURRED REPEATEDLY, SO THAT THE AVERAGE HEALTH RISK OVER THE BATHING SEASON EXCEEDED 15 CASES PER 1,000 SWIMMERS.
AT PRESENT, TWO BATHING BEACHES, CASTLE PEAK AND OLD CAFETERIA, HAVE BEEN DECLARED UNSUITABLE FOR SWIMMING, BASED ON THE WATER QUALITY DURING PAST SEASONS.
THEY ARE POLLUTED BY FAECAL WASTE. THE PUBLIC ARE ADVISED NOT TO SWIM AT THE TWO BEACHES.
/IN ADDITION,