Three members of the 41-member City of Alexandria School-Based Health Clinic Task Force are opposed to the recommendation that a center be established at or near our senior public high school {Close to Home, Aug. 23}.

Rev. William L. Walsh, Mary B. Dwyer and William E. Fenton Jr. charge that I ''handpicked'' the members of the task force and that I ''manipulated the flow of information by shredding {their} report'' and asking only majority members to write a summary of the 40-page report.

These charges are more than hyperbolic rhetoric. They are part of a continuing effort by some Catholic and some fundamentalist leaders to circumvent the fact that 90 percent of the task force members stated unequivocally that a school-based health center is sound public policy.

The members of the task force were not ''handpicked.'' They represent every local organization that 1) expressed an interest in the issue, 2) were recommended by council members, or 3) as in the case of Rev. Walsh, were asked by me to represent any views that might otherwise not receive sufficient consideration. This inclusive approach produced a 41-member task force that includes the United Way, the community Y, the Urban League, the Alexandria Hospital, the Medical Society, the School Nurses Association, the Public Health Advisory Commission, the PTA Council and each senior and junior high school PTA.

There are a many single-parent households in Alexandria. In addition, 54 percent of Alexandria's public school students are in families whose incomes are inadequate to afford the cost of daily school lunches. These families are hard-pressed to afford regular medical care for their children in other than emergency situations.

Within this context, Alexandria is experiencing a crisis in adolescent reproductive health care. One out of eight of Alexandria's teen-age girls becomes pregnant every year. Half of those pregnancies are terminated by abortions. The infant mortality rate for those children born is by far the highest in Northern Virginia. Approximately 80 percent of the children born to these children will be born illegitimately. Teen-age motherhood is the single most identifiable cause of the feminization and perpetuation of poverty in Alexandria.

The task force determined that school-based health centers have been the most successfully proven method of stemming this tide of unwanted teen-age pregnancy. They have also been highly effective in addressing other serious behavioral health problems. There are 100 centers operating successfully throughout the country.

Sexual abstinence and male accountability would be advocated by Alexandria's center.

Since 85 percent of students surveyed by the task force registered a phenomenally high concern over drug and alcohol addiction particularly on the part of parents, there will be expanded family and individual substance abuse counseling offered.

Finally, I must correct the charge that I attempted to ''censor'' the minority report by having a summary written by task force members in the majority. The minority report has been distributed with each of the several hundred majority reports so far distributed.

Several thousand opposition fliers have been distributed at the back of churches in Alexandria. The front cover of this flier poses the question: ''Would you encourage your teen-ager to indulge in promiscuous sex? Then say no! to High School Clinics.'' It then repeats a sermon by fundamentalist preacher W. Graham Smith, which begins by quoting ''Tales Out of School'' by Patrick Welsh -- in Rev. Smith's words, ''a respected, dedicated and impassioned English teacher at T. C. Williams High School.''

It was this same Patrick Welsh who volunteered to summarize the task force report along with Candis Ramelli, another T. C. Williams teacher, and Gina LaSasso, who is the school board's appointed student representative and who responded to Walsh, Dwyer and Fenton on this page last week.

I agree with their description of Patrick Welsh. I wish we would agree on more. -- James P. Moran Jr. is the mayor of Alexandria.